On April 20, 2025 NASA's <i>Lucy</i> mission performed a flyby of the main belt asteroid (52246) Donaldjohanson, hereafter DJ. <i>Lucy</i> is a NASA Discovery-class mission to study primitive bodies near both the L₄ and L₅ Lagrange points with Jupiter - the Jupiter Trojans [1]. The flyby of DJ was intended as a full-scale end-to-end test of <i>Lucy</i>'s systems before its first Trojan encounter in 2027.  The spacecraft and ground systems performed flawlessly.

DJ is a C-type asteroid [2] with a semi-major axis of 2.4 au. From the ground, it is observed to have a high-amplitude lightcurve with a rotation period of ~250 hr [3].  It is a member of the Erigone asteroid family, which an age estimated to be only 155 Myr [4].  <i>Lucy</i> approached DJ from a phase angle of 14 deg and with a relative velocity of 13.4 km/sec [1].  Its close approach distance was about 960 km.  

<i>Lucy</i> determined that DJ is an elongated bi-lobed object about 8 km long with an axis ratio greater than 2 to 1.  It has a well-defined neck between the two lobes that shows evidence of significant geological processing.  One lobe appears to be significantly larger than the other.  <i>Lucy</i> obtained useful scientific data from all of its instruments:  L'LORRI, a high-resolution panchromatic camera [5], TTCam  (a wide-field panchromatic camera [6]), L'Ralph/MVIC (a five color color camera [7]), L'Ralph/LEISA (a near-infrared spectroscopic mapper [7]), and L'TES (a thermal IR spectrometer [8]).  The results will be summarized here.  More details will be given in subsequent presentations in this session.

[1] Levison et al. (2025), PSJ, 2:171, doi:10.3847/PSJ/abf840.
[2] Souza-Feliciano et al. (2020), Icarus, 338, 113463.
[3] Ferrais et al. (2021), AAS/DPS meeting #53, id.306.19.
[4] Marchi et al. (2025), PSJ, 6:59, doi:10.3847/PSJ/adb4f4.
[5] Weaver et al. (2023), SSRv, 209, doi:10.1007/s11214-023-01028-z.
[6] Bell et al. (2023), SSRv, 219, doi:10.1007/s11214-023-01030-5.
[7] Reuter et al. (2023), 219, doi:10.1007/s11214-023-01009-2.
[8] Christensen et al. (2024), SSRv,  220. doi:10.1007/s11214-023-01029-y.

How to cite: Levison, H., Marchi, S., Noll, K., Spencer, J., and Statler, T. and the The Lucy Team: The Lucy Encounter with asteroid (52246) Donaldjohanson - An Overview, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-408, https://doi.org/10.5194/epsc-dps2025-408, 2025.

The Lucy Mission is a NASA Discovery class mission to study the Trojan asteroids. Its targets are the asteroids Eurybates (Aug. 2027), Polymele (Sep. 2027), Leucus (Apr. 2028), Orus (Nov. 2028) and the Patroclus – Menoetius binary (Mar. 2023). On its way to the Trojans, Lucy performed test flybys of two main belt asteroids. The second flyby was of the asteroid Donaldjohanson (DJ), with closest approach occurring April 20^th, 2025. One of the aims of the flyby was to test planning and executing a complex science encounter sequence.

Images taken during the approach phase by the L’LORRI instrument, the high-resolution panchromatic camera onboard Lucy, were used to build up a lightcurve of DJ. The ground-based lightcurve, with a large amplitude and long period, had already shown unusual characteristics, but Lucy provided a highly complementary dataset with uniform cadence, no weather interruptions, and a unique viewing geometry. The relevant Lucy datasets include L’LORRI images taken for optical navigation and for potential satellites, which were taken at a lower cadence of once every two days or once a day closer to encounter, and approach photometry observations. The approach photometry imaging, from E-4 days to E-13 hours from closest approach, provided higher cadence data alternating between 0.75 hours and 1.25 hours. This higher time-resolution data provided detailed observation of one minimum of the lightcurve.

How to cite: Solanki, I., Spencer, J., Mottola, S., Statler, T., Levison, H., Noll, K., Marchi, S., and Dello Russo, N. and the The Lucy Team: Lightcurve of Asteroid (52246)Donaldjohanson from the Lucy Spacecraft’s Observations, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-983, https://doi.org/10.5194/epsc-dps2025-983, 2025.

On April 20, 2025, while crossing the Main Asteroid Belt, the NASA Lucy mission—en route to the Jupiter Trojan regions—encountered its second cruise target, the C-type asteroid (52246) Donaldjohanson.

During the fly-by, the L’LORRI instrument [1] acquired a series of images suitable for stereo reconstruction, covering about 40% of the asteroid’s surface. The images have a ground sampling distance ranging from 17 to 5 m/pixel and were taken at solar phase angles between 0.9° and 52°. Due to the asteroid’s slow rotation (with a spin period exceeding 10 days), no appreciable rotation was observed in the disk-resolved images.

To achieve global shape reconstruction and determine the spin state, we complemented the stereo-photogrammetric data with contour information (limb and terminator features) and lightcurve data. This lightcurve information was drawn from two sources: sequences acquired by L’LORRI during the two months preceding the approach [2]and ground-based lightcurves obtained over the past six apparitions. The ground-based observations had already revealed that Donaldjohanson is currently in a state of complex rotation.

By combining these datasets, we expect to develop a detailed digital shape model of the illuminated portion of the asteroid, along with a low-order model of its non-illuminated hemisphere. Additionally, we plan to derive the asteroid’s rotational dynamics and determine its inertia tensor—results that will be presented at the conference.

Acknowledgement: The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C

References: [1] Weaver, H.A., et al., Space Science Reviews, 219, 82, 2023. [2] Solanki et al., this meeting.

How to cite: Mottola, S., Preusker, F., Statler, T., Buie, M., Spencer, J., Barnouin, O., Bierhaus, E., Noll, K., Marchi, S., Levison, H., and Lucy Team, T.: Shape Reconstruction and Rotation State of Asteroid (52246) Donaldjohanson from Lucy Imaging and Ground-Based Photometry, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-1022, https://doi.org/10.5194/epsc-dps2025-1022, 2025.

Spacecraft flybys offer unparalleled opportunities to investigate small Solar System bodies. These encounters enable disk-resolved imaging and spectroscopy, revealing surface composition, morphology, collisional history, and the potential presence of satellites, capabilities that far exceed what is achievable from Earth. Despite their scientific utility, such encounters remain rare due to the high costs and operational complexity of spacecraft missions. Within this context, NASA’s Lucy mission stands out, having completed two flybys of Main Belt Asteroids and targeting five flybys within the Jupiter Trojan clouds. Lucy’s recent encounter with (152830) Dinkinesh, a ~700-meter MBA, yielded striking and unexpected returns, including the discovery of a contact binary satellite, highlighting the unique scientific value of sub-kilometer targets. Notably, only one of the five Jupiter Trojan flybys target the L₅ cloud, raising the question of whether it is possible to identify an additional Dinkinesh-sized L₅ Jupiter Trojan flyby target for Lucy. In this talk, we present estimates of the number of sub-kilometer L₅ Trojans accessible to Lucy under two operational scenarios:  before and after the Patroclus-Menoetius flyby. We describe an improved model of the L₅ cloud’s spatial distribution and outline the observational constrains (sky area, search window, and survey duration) required to enable a targeted search. Finally, we discuss the scientific impact of such a flyby, particularly in the context of the L₄/L₅ population asymmetry.

How to cite: Salazar Manzano, L., Gerdes, D., Napier, K., Lin, H. W., Adams, F., Frincke, T., Marchi, S., Noll, K., and Spencer, J.: Opportunities for a Dinkinesh-Sized Trojan Flyby in the L5 Cloud, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-1183, https://doi.org/10.5194/epsc-dps2025-1183, 2025.

NASA’s Lucy mission [1] will explore the Trojan asteroids, a population of small bodies in the Sun-Jupiter L4 and L5 Lagrange points.  En route to the Trojans, Lucy encountered the main belt C-type asteroid (52246) Donaldjohanson on April 20, 2025 [2]. The flyby was an opportunity to assess the performance of the science instruments when observing a small body, as well as test the spacecraft functions needed for the Trojan encounters.

Data types from the Donaldjohanson encounter include visible images from the L’LORRI [3] and TTCam [4] instruments.  The images span a range of phase angles, resolutions, and viewing geometries.  These data enable measurements of body dimensions and shape [5], albedo [6], and surface features. 

The overall shape of Donaldjohanson suggests a contact binary, a situation in which two objects merged to become a single object, with the shape of the merged object expressing a bi-lobed geometry; the connection between the two lobes is narrower and informally called the “neck”.  One lobe apparently is larger than the other [5].  Craters and boulders, which are common surface features on other asteroids, are present across both lobes and the neck [7, 8].  The surfaces of the lobes express similar regional surface morphologies, apparently dominated by impact cratering.  The large lobe has pit-chain like features [9]. The neck’s surface is generally smoother than the lobes, and the craters on the neck often appear to be shallower, and some have relatively flat floors.   The neck has two prominent ridge-like features that are approximately at either end of its hourglass shape; i.e., the ridges are approximately at the interfaces between the neck and the two lobes.  The neck’s geometry relative to the lobes results in a distinct region of surface gravity, surface stress, and volumetric stress [10].

Collectively the features, their distributions, and their morphologies may reflect processes expected to be common among all asteroids (i.e. cratering, boulder and regolith generation and redistribution), as well as processes that are the result of contact binary formation and evolution.  More broadly, contact binaries have been observed in comets and Kuiper Belt objects (in addition to asteroids), and the novel high-resolution Lucy data will help elucidate the processes for this class of object.

References

[1] Levison et al. (2021) PSJ 2, 171. [2] Levison et al. (2025) this conference. [3] Weaver et al. (2023) SSR 219, article id 82.  [4] Bell et al. (2023) SSR 219, article id 86. [5] Mottola et al. (2025), this conference. [6] Spencer et al. (2025), this conference. [7] Robbins et al. (2025), this conference. [8] Scully et al. (2025), this conference. [9] Nichols-Fleming et al. (2025), this conference. [10] Hirabayashi et al. (2025), this conference.

Acknowledgements

The Lucy mission is funded through the NASA Discovery program via contract numbers NNM16AA08C and NNG17FD73C. 

How to cite: Bierhaus, E., Robbins, S., Scully, J., Hirabayashi, M., Nichols-Fleming, F., Mottola, S., Barnouin, O., Agrusa, H., Sunshine, J., Stern, A., Binzel, R., Noll, K., Spencer, J., Marchi, S., and Levison, H.: An overview of the geology on the C-type Main Belt asteroid (52246) Donaldjohanson from NASA’s Lucy flyby, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-445, https://doi.org/10.5194/epsc-dps2025-445, 2025.

On April 20, 2025, NASA’s Lucy spacecraft [1] completed its closest approach with main-belt asteroid (52246) Donaldjohanson [2]. Donaldjohanson appears to be a contact binary and is about 8 km long with a greater than 2 to 1 axis ratio [3]. High resolution images from L’LORRI (Lucy Long Range Reconnaissance Imager) [4] throughout the flyby show linear clusters of depressions, or pit chains, on Donaldjohanson’s large lobe.

The term “pit chain” is not diagnostic of formation mechanism, and these features can form from a range of processes including primary or secondary impacts, venting, or dilational faulting [e.g., 5–7]. We will discuss the most likely formation mechanism(s) for the pit chains on Donaldjohanson and compare the morphology of these features with that of pit chains observed on other small bodies such as (433) Eros, Phobos, (243) Ida, and (951) Gaspra [8–13].

Under the assumption that Donaldjohanson’s pit chains form due to the drainage of unconsolidated material into subsurface structures, we will use the depths of these pits to calculate a minimum thickness for a layer of unconsolidated regolith-like material on the surface of Donaldjohanson. We will compare this estimate with regolith thickness estimates from the study of impact craters on Donaldjohanson as well as estimates from prior studies of pit chains on Eros, Phobos, Ida, and Gaspra.

Acknowledgements: The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C. F. Nichols-Fleming is supported by the Lucy L4 PSP award #80NSSC25K7723.

References: [1] Levison, H. F. et al. (2021) Planet. Sci. J., 2, 171. [2] Levison, H. et al. (2025) EPSC-DPS2025. [3] Mottola, S. et al. (2025) EPSC-DPS2025. [4] Weaver, H. A. et al. (2023) Space Sci Rev, 219, 82. [5] Wyrick, D. et al. (2004) Journal of Geophysical Research: Planets, 109. [6] Wyrick, D. Y. et al. (2010) 41^st LPSC, Abstract No. 1413. [7] Wyrick, D. Y. and Buczkowski, D. L. (2022) Journal of Geophysical Research: Planets, 127, e2022JE007281. [8] Thomas, P. et al. (1979) Journal of Geophysical Research: Solid Earth, 84, 8457–8477. [9] Prockter, L. et al. (2002) Icarus, 155, 75–93. [10] Hurford, T. A. et al. (2016) Journal of Geophysical Research: Planets, 121, 1054–1065. [11] Sullivan, R. et al. (1996) Icarus, 120, 119–139. [12] Veverka, J. et al. (1994) Icarus, 107, 72–83. [13] Buczkowski, D. L. et al. (2008) Icarus, 193, 39–52.

How to cite: Nichols-Fleming, F., Scully, J., Costello, E., Martin, A., Bierhaus, E., Barnouin, O., Dello Russo, N., Weaver, H., Marchi, S., Noll, K., Spencer, J., and Levison, H. and the Lucy Team: Pit Chains on Asteroid (52246) Donaldjohanson, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-665, https://doi.org/10.5194/epsc-dps2025-665, 2025.

NASA’s Lucy mission [1] to the Trojan asteroids executed an engineering test flyby of asteroid (52246) Donaldjohanson on 20 April 2025.  Data were gathered by all Lucy instruments, including the Lucy Long-Range Reconnaissance Imager (L’LORRI [2]), which is a panchromatic 1,024×1024 pixel framing camera.  Data at up to a few meters per pixel revealed a bilobate body approximately 3–4 km at its widest and approximately 9 km long [3].  The larger lobe was observed at solar incidence angles more favorable to recognition of topographic features.

We have mapped the visible crater and boulder populations across the body.  We will present the crater population in context with other small bodies, an investigation of crater population similarities or variations across Donaldjohanson, crater modification variations across the body in context with the gravity field, equilibrium population considerations, and a minimum model surface age.  In addition, we will present data on the spatial distribution and size-frequency distribution of isolated topographic highs (nominally considered to be boulders) in comparison with boulders on other small bodies.

Acknowledgement:  The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C.

References:

[1] Levison, H. and 24 co-authors (2021).  Lucy Mission to the Trojan Asteroids: Science Goals.  The Planetary Science Journal, v. 2, Issue 5, id. 171.

[2] Weaver, H.A. and 22 co-authors (2023).  The Lucy Long Range Reconnaissance Imager (L'LORRI).  Space Science Reviews, v. 219, article id 82.

[3] Mottola et al. (2025). Shape Reconstruction and Rotation State of Asteroid (52246) Donaldjohanson from Lucy Imaging and Ground-Based Photometry.  This conference.

How to cite: Robbins, S., Marchi, S., Bierhaus, B., Scully, J., Bottke, W., Noll, K., Spencer, J., Levison, H., and Lucy Team, T.: The Crater and Boulder Populations of Asteroid (52246) Donaldjohanson, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-935, https://doi.org/10.5194/epsc-dps2025-935, 2025.

NASA’s Lucy [1] successfully flew by the C-type asteroid (52246) Donaldjohanson [2] on April 20, 2025 [3]. The asteroid exhibited unique topographic and geological features [4-6]. While the imaged area was limited to the illuminated hemisphere at the time of the flyby, L’LORRI [7] and TTCAM [8] images reveal the asteroid’s elongated and contact binary shape [4, 9]. The asteroid has a highly elongated shape, about 8 km long, with a greater than 2:1 axis ratio [4].

We apply a mission-developed shape model [9] to investigate Donaldjohanson’s surface gravity field and structural properties. Due to its complex shape, escape speeds are low and vary along the body. The slow rotation does not contribute significantly to surface acceleration. We expect the interior to be dominated by compression, but the asteroid’s irregular topography makes the stress field complex. Given its slow spin period, our analysis is expected to be almost independent of the rotational effect.

The presentation will discuss Donaldjohanson’s structural and gravitational environment and the implications for its formation and evolution scenarios.

The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C. This study is also supported under the NASA Lucy PSP program.

[1] Levison et al. (2025), PSJ, 2:171, doi:10.3847/PSJ/abf840.

[2] Marchi et al. (2025), PSJ, 6:59, doi:10.3847/PSJ/adb4f4.

[3] Levison et al. (2025), this conference.

[4] Bierhaus et al. (2025), this conference.

[5] Scully et al. (2025), this conference.

[6] Nichols-Fleming et al. (2025), this conference.

[7] Weaver et al. (2023) SSR 219, doi:10.1007/s11214-023-01028-z.

[8] Bell et al. (2023) SSR 219, doi:10.1007/s11214-023-01030-5.

[9] Mottola et al. (2025), this conference.

How to cite: Hirabayashi, M., Mottola, S., Bierhaus, E., Britt, D., Agrusa, H., Barnouin, O., Scully, J., Sunshine, J., Marchi, S., Noll, K., Spencer, J., Levison, H., and Team, L.: Interior and gravity characterization of the C-type asteroid (52246) Donaldjohanson seen by NASA’s Lucy flyby, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-140, https://doi.org/10.5194/epsc-dps2025-140, 2025.

The NASA Lucy mission was designed to provide the first reconnaissance of Jupiter Trojan asteroids.  These primitive bodies hold important clues to the origin and evolution of the Solar System.  The Lucy spacecraft is currently en route to its encounters with Trojan asteroids in the L₄ swarm in 2027 and 2028, and the L₅ swarm in 2033 [1].  On its way through the Main Belt, Lucy flew past the asteroid (52246) Donaldjohanson on April 20, 2025.  The main purpose of the flyby was to support mission preparation for the primary science targets, the Trojan asteroids. The Linear Etalon Imaging Spectral Array (LEISA) mapping spectrometer [2,3], part of the L’Ralph instrument, collected multiple spectral datasets during the encounter with Donaldjohanson.  LEISA covers the spectral range 0.97 – 3.95 μm with a variable spectral resolving power ranging from ~50 to 160 (Δλ<10 nm).

Several primitive asteroid families have been identified in the inner Main Belt.  These families are of interest for their potential to deliver primitive material into near-Earth space, and potentially even sourcing the carbonaceous meteorites that fall to Earth.  Donaldjohanson is a member of one of these families, the Erigone collisional family.  The collisional disruption of the Erigone family occurred ~155 Myr ago [4].  Ground-based observations have revealed that the Erigone family consists of primitive C-complex asteroids, the majority of which show evidence for a 0.7-μm absorption due to Fe-bearing phyllosilicates [5] and spectral slopes that are neutral to slightly red [6].  The only ground-based near-infrared data published of Donaldjohanson itself [7] are too noisy for a reliable interpretation. We will report on the Lucy near-infrared spectral observations of Donaldjohanson, with a focus on a search for absorption features due to materials seen in ground-based spectra of Erigone family members and found in analog carbonaceous meteorites, including hydrated silicates and organic molecules.  The spatially resolved LEISA data also enable assessment of any potential spectral heterogeneity on Donaldjohanson.

Acknowledgements

The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C.

References

[1] Levison, H.F., et al. 2021. Lucy Mission to the Trojan Asteroids: Science Goals. Planet. Sci. J. 2:171 (13pp)

[2] Reuter, D.C., et al. 2023. L’Ralph: A Visible/Infrared Spectral Imager for the Lucy Mission to the Trojans. Space Sci. Rev. 219:69.

[3] Simon, A.A., et al. 2025. Lucy L′Ralph In-flight Calibration and Results at (152830) Dinkinesh. Planet. Sci. J. 6:7 (11pp).

[4] Marchi, S., et al. 2025. A Pre-flyby View on the Origin of Asteroid Donaldjohanson, a Target of the NASA Lucy Mission. Planet. Sci. J. 6:59 (19pp).

[5] Morate, D., et al. 2016. Compositional study of asteroids in the Erigone collisional family using visible spectroscopy at the 10.4m GTC. Astron. Astrophys. 585, A129.

[6] Harvison, B., et al. 2024. PRIMASS near-infrared study of the Erigone collisional family. Icarus 412, 115973.

[7] Sharkey, B.N.L., et al. 2019. Compositional Constraints for Lucy Mission Trojan Asteroids via Near-infrared Spectroscopy. Astron. J. 158:204 (13pp).

How to cite: Emery, J., Simon, A., Kaplan, H., Grundy, W., Sunshine, J., Protopapa, S., Reuter, D., Lundsford, A., Montanaro, M., Weigle, G., Solanki, I., Binzel, R., Spencer, J., Noll, K., Marchi, S., and Levison, H. and the Lucy Team: Compositional analysis of (52246) Donaldjohanson from the Lucy flyby, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-379, https://doi.org/10.5194/epsc-dps2025-379, 2025.

Introduction: On the 20th of April 2025, NASA’s Lucy mission [1] flew by the C-type main-belt asteroid (52246) Donaldjohanson (hereafter DJ). The encounter’s goal was to test the spacecraft and instruments during an observation sequence commensurate with those to be used on Lucy’s main targets – Jupiter’s Trojan asteroids. Data returned from the panchromatic Lucy LOng Range Reconnaissance Imager (L’LORRI, 450-850 nm, [2]) during this testing sequence reveal the asteroid to be bi-lobed and elongated shape (Fig. 1).

DJ is a member of the Erigone collisional family, named after the parent body asteroid (163) Erigone (see references in [3]). Ground-based color observations (Fig. 2) show it to decrease in color towards shorter wavelengths, possibly due to the presence of hydrated materials [4].

In this work, we present an analysis of color images taken by Lucy’s Multispectral Visible Imaging Camera (MVIC). MVIC consists of six time delay integration (TDI) charge-coupled devices (CCDs). TDI works by synchronizing the transfer rate of the image between CCD rows and the relative motion of the instrument allowing a high signal to noise image to be built up even for fast scans. It covers wavelengths between 375 nm and 950 nm using five color filters and a panchromatic one (see Table 1).

Color Analysis: We focus our analysis on images acquired with the four wide band filters: violet, green, orange and near-IR. Our results will provide resolved color variations and contextualise DJ’s color with respect to ground-based observations of DJ, Erigone (Fig. 2), other members of the Erigone family, and the broader asteroid and small body populations.

Table 1 – MVIC filters [5]

Figure 1 – (52246) Donaldjohanson as seen by the panchromatic Lucy L’LORRI instrument, taken on April 20, 2025 at 17:51 UTC.

 Figure 2 – Ground-based normalized (at 0.55 µm) visible spectrum of DJ (blue) acquired with the Gran Telescopio Canarias compared to the Bus-DeMeo’s Cg-type (black) and the mean spectrum of the C-type members within the Erigone family (grey). Taken from [6].

 Acknowledgments: The Lucy mission is funded through the NASA Discovery program on contract No. NNM16AA08C.

References: [1] Levison et al. (2021) PSJ 2, 171. [2] Weaver et al. (2023), SSR 219, 82. [3] Marchi et al., (2025) PSJ 6, 59. [4] Vilas (1995) Icarus 115, 217-218. [5] Reuter et al. (2023), SSR 219, 69. [6] Souza-Feliciano et al. (2020), Icarus 338, 113463.

How to cite: Howett, C., Kaplan, H., Protopapa, S., Emery, J., Sunshine, J., Simon, A., Lunsford, A., Weigle, G., Grundy, W., Solanki, I., Marchi, S., Levison, H., Noll, K., Spencer, J., Binzel, R., and Team, L.: Resolved Color of Main-Belt Asteroid (52246) Donaldjohanson as seen by NASA’s Lucy Mission, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–13 Sep 2025, EPSC-DPS2025-164, https://doi.org/10.5194/epsc-dps2025-164, 2025.