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52246 Donaldjohanson
В истекающем году к астероидам стартовали два новых аппарата. Шестнадцатого октября взял старт зонд «Люси». Программой полета сначала предусматривается два последовательных пролета Земли: 16 октября 2022 года «Люси» должна в первый раз пролететь у нашей планеты на высоте 300 км, следующий пролет состоится в декабре 2024 года. В апреле 2025 года при прохождении главного пояса астероидов предусмотрен пролет астероида Дональд Джохансон ( <anchor>52246 Donaldjohanson</anchor>), а затем в 2027 году станция должна прибыть в точку Лагранжа L1 системы «Солнце — Юпитер» и провести там исследование четырех астероидов- «греков». В декабре 2030 года станция должна в третий раз пролететь мимо Земли, а в марте 2033 года прибудет в точку Лагранжа L5 системы «Солнце — Юпитер»: там она должна провести исследование двойной системы астероидов-«троянцев» Патрокла и Менетия.
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- [1Orbit and classification](#Orbit_and_classification)
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# 52246 Donaldjohanson

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Asteroid

52246 Donaldjohanson[![](//upload.wikimedia.org/wikipedia/commons/thumb/1/1a/52246_Donaldjohanson_Hubble_8x_upscale.png/290px-52246_Donaldjohanson_Hubble_8x_upscale.png)](/wiki/File:52246_Donaldjohanson_Hubble_8x_upscale.png)

Donaldjohanson imaged by the [Hubble Space Telescope](/wiki/Hubble_Space_Telescope "Hubble Space Telescope") on 9 January 2021

Discovery[\[1\]](#cite_note-MPC-object-1)[Discovered by](/wiki/List_of_minor_planet_discoverers "List of minor planet discoverers")[S. J. Bus](/wiki/Schelte_Bus "Schelte Bus")[Discovery site](/wiki/List_of_observatory_codes "List of observatory codes")[Siding Spring Obs.](/wiki/Siding_Spring_Observatory "Siding Spring Observatory")Discovery date2 March 1981Designations

[MPC designation](/wiki/Minor-planet_designation "Minor-planet designation")

(52246) Donaldjohanson

Named after

[Donald Johanson](/wiki/Donald_Johanson "Donald Johanson")[\[1\]](#cite_note-MPC-object-1)

( [paleoanthropologist](/wiki/Paleoanthropologist "Paleoanthropologist"))

[Alternative designations](/wiki/Provisional_designation_in_astronomy "Provisional designation in astronomy")

1981 EQ5 **·** 1998 YF26

[Minor planet category](/wiki/Minor_planet#Populations "Minor planet")

[main-belt](/wiki/Main-belt "Main-belt")[\[1\]](#cite_note-MPC-object-1)[\[2\]](#cite_note-jpldata-2) **·**( [inner](/wiki/Kirkwood_gap "Kirkwood gap"))

[Erigone](/wiki/Erigone_family "Erigone family")[\[3\]](#cite_note-Levison-2017-3)[\[4\]](#cite_note-Ferret-4)[Orbital characteristics](/wiki/Osculating_orbit "Osculating orbit")[\[2\]](#cite_note-jpldata-2)[Epoch](/wiki/Epoch_(astronomy) "Epoch (astronomy)") 25 February 2023 ( [JD](/wiki/Julian_day "Julian day") 2460000.5)[Uncertainty parameter](/wiki/Uncertainty_parameter "Uncertainty parameter") 0Earliest [precovery](/wiki/Precovery "Precovery") date14 February 1981[\[1\]](#cite_note-MPC-object-1)[Aphelion](/wiki/Perihelion_and_aphelion "Perihelion and aphelion")2.830 [AU](/wiki/Astronomical_unit "Astronomical unit")[Perihelion](/wiki/Perihelion_and_aphelion "Perihelion and aphelion")1.936 AU

[Semi-major axis](/wiki/Semi-major_and_semi-minor_axes "Semi-major and semi-minor axes")

2.383 AU[Eccentricity](/wiki/Orbital_eccentricity "Orbital eccentricity")0.1876

[Orbital period (sidereal)](/wiki/Orbital_period "Orbital period")

3.68 yr (1,343 d)

[Mean anomaly](/wiki/Mean_anomaly#Mean_anomaly_at_epoch "Mean anomaly")

186.269 [°](/wiki/Degree_(angle) "Degree (angle)")

[Mean motion](/wiki/Mean_motion "Mean motion")

0° 16m 4.79s / day[Inclination](/wiki/Orbital_inclination "Orbital inclination")4.424°

[Longitude of ascending node](/wiki/Longitude_of_the_ascending_node "Longitude of the ascending node")

262.809°

[Argument of perihelion](/wiki/Argument_of_periapsis "Argument of periapsis")

213.016°[Physical characteristics](/wiki/Standard_asteroid_physical_characteristics "Standard asteroid physical characteristics")

[Mean diameter](/wiki/Mean_radius_(astronomy) "Mean radius (astronomy)")

3.895±0.013 [km](/wiki/Kilometre "Kilometre")[\[5\]](#cite_note-Masiero-2011-5)

[Synodic rotation period](/wiki/Synodic_rotation_period "Synodic rotation period")

251±1 [hr](/wiki/Hour "Hour")[\[6\]](#cite_note-Levison2021-6)

[Geometric albedo](/wiki/Geometric_albedo "Geometric albedo")

0.103±0.019[\[5\]](#cite_note-Masiero-2011-5)

[Spectral type](/wiki/Asteroid_spectral_types "Asteroid spectral types")

[C](/wiki/C-type_asteroid "C-type asteroid")[\[3\]](#cite_note-Levison-2017-3)

[Absolute magnitude _(H)_](/wiki/Absolute_magnitude#Solar_System_bodies_(H) "Absolute magnitude")

15.69[\[2\]](#cite_note-jpldata-2)

**52246 Donaldjohanson** ( [provisional designation](/wiki/Provisional_designation "Provisional designation") **1981 EQ5**) is a carbonaceous Erigonian [asteroid](/wiki/Asteroid "Asteroid") from the inner regions of the [asteroid belt](/wiki/Asteroid_belt "Asteroid belt"), approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 2 March 1981, by American astronomer [Schelte Bus](/wiki/Schelte_Bus "Schelte Bus") at the [Siding Spring Observatory](/wiki/Siding_Spring_Observatory "Siding Spring Observatory") in Australia. The [C-type asteroid](/wiki/C-type_asteroid "C-type asteroid") is a target of the [_Lucy_ mission](/wiki/Lucy_(spacecraft) "Lucy (spacecraft)") and was aptly named after American paleoanthropologist [Donald Johanson](/wiki/Donald_Johanson "Donald Johanson"), the discoverer of the ["Lucy" hominid fossil](/wiki/Lucy_(Australopithecus) "Lucy (Australopithecus)").[\[1\]](#cite_note-MPC-object-1)

## Orbit and classification

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=1 "Edit section: Orbit and classification")\]

[![](//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Animation_of_Lucy%27s_trajectory_around_Sun.gif/260px-Animation_of_Lucy%27s_trajectory_around_Sun.gif)](/wiki/File:Animation_of_Lucy%27s_trajectory_around_Sun.gif) Animation of Lucy's trajectory around Sun

Lucy **·**  Sun **·**  Earth **·**  52246 Donaldjohanson **·** 3548 Eurybates **·**  21900 Orus **·**  617 Patroclus

Donaldjohanson is a member of the [Erigone family](/wiki/Erigone_family "Erigone family") ([406](/wiki/FIN_tbl#406 "FIN tbl")),[\[3\]](#cite_note-Levison-2017-3)[\[4\]](#cite_note-Ferret-4) a large carbonaceous [asteroid family](/wiki/Asteroid_family "Asteroid family") of nearly 2,000 known members, which is named after its [parent body](/wiki/Parent_body "Parent body") [163 Erigone](/wiki/163_Erigone "163 Erigone"). It is a relatively old family that was created approximately 130 million years ago.[\[7\]](#cite_note-Nesvorny-2014-7)

It orbits the Sun in the [inner](/wiki/Kirkwood_gap "Kirkwood gap") asteroid belt at a distance of 1.9–2.8 [AU](/wiki/Astronomical_unit "Astronomical unit") once every 3 years and 8 months (1,345 days; [semi-major axis](/wiki/Semi-major_axis "Semi-major axis") of 2.38 AU). Its orbit has an [eccentricity](/wiki/Orbital_eccentricity "Orbital eccentricity") of 0.19 and an [inclination](/wiki/Orbital_inclination "Orbital inclination") of 4 [°](/wiki/Degree_(angle) "Degree (angle)") with respect to the [ecliptic](/wiki/Ecliptic "Ecliptic").[\[2\]](#cite_note-jpldata-2) A first [precovery](/wiki/Precovery "Precovery") was taken at the discovering observatory in February 1981, extending the body's [observation arc](/wiki/Observation_arc "Observation arc") by 2 weeks prior to its official discovery observation.[\[1\]](#cite_note-MPC-object-1)

## Physical characteristics

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=2 "Edit section: Physical characteristics")\]

Donaldjohanson has been characterized as a carbonaceous [C-type asteroid](/wiki/C-type_asteroid "C-type asteroid"),[\[3\]](#cite_note-Levison-2017-3) in-line with the C and [X](/wiki/C-type_asteroid "C-type asteroid") overall [spectral type](/wiki/Asteroid_spectral_type "Asteroid spectral type") for Erigonian asteroids.[\[7\]](#cite_note-Nesvorny-2014-7): 23  It has an [absolute magnitude](/wiki/Absolute_magnitude "Absolute magnitude") of 15.5.[\[2\]](#cite_note-jpldata-2)

### Lightcurve

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=3 "Edit section: Lightcurve")\]

Photometric observations of Donaldjohanson in August 2020 revealed that it is a [slow rotator](/wiki/List_of_slow_rotators_(minor_planets) "List of slow rotators (minor planets)") with an exceptionally high [lightcurve](/wiki/Lightcurve "Lightcurve") amplitude of 1.7 [magnitude](/wiki/Magnitude_(astronomy) "Magnitude (astronomy)").[\[8\]](#cite_note-HST-16452-8)[\[6\]](#cite_note-Levison2021-6) The lightcurve suggests that Donaldjohanson must either be highly elongated in shape, or possibly a synchronous [binary system](/wiki/Binary_system "Binary system").[\[8\]](#cite_note-HST-16452-8) Extensive photometric observations by the two [TRAPPIST](/wiki/TRAPPIST "TRAPPIST") telescopes from November 2020 to February 2021 determined the rotation period of Donaldjohanson to be approximately 252 hours.[\[9\]](#cite_note-Ferrais2021-9)

### Diameter and albedo

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=4 "Edit section: Diameter and albedo")\]

According to the survey carried out by NASA's [Wide-field Infrared Survey Explorer](/wiki/Wide-field_Infrared_Survey_Explorer "Wide-field Infrared Survey Explorer") with its subsequent [NEOWISE](/wiki/NEOWISE "NEOWISE") mission, Donaldjohanson measures 3.895 kilometers in diameter and its surface has an [albedo](/wiki/Astronomical_albedo "Astronomical albedo") of 0.103.[\[5\]](#cite_note-Masiero-2011-5)

## Exploration

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=5 "Edit section: Exploration")\]

Donaldjohanson is planned to be visited by the [_Lucy_ spacecraft](/wiki/Lucy_(spacecraft) "Lucy (spacecraft)") that was launched on 16 October 2021. The flyby is scheduled for 20 April 2025, and will approach the asteroid to a distance of 922 kilometers (573 mi) at a relative velocity of 13.4 kilometers (8.3 mi) per second.[\[3\]](#cite_note-Levison-2017-3)

## Naming

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=6 "Edit section: Naming")\]

This [minor planet](/wiki/Minor_planet "Minor planet") is planned to be visited by the _[Lucy](/wiki/Lucy_(spacecraft) "Lucy (spacecraft)")_ spacecraft, which would observe it en route to its main target of several [Jupiter trojans](/wiki/Jupiter_trojans "Jupiter trojans").[\[10\]](#cite_note-planetary.org-10) The Lucy probe is named after the ["Lucy" hominid fossil](/wiki/Lucy_(Australopithecus) "Lucy (Australopithecus)"), while Donaldjohanson is named for that fossil's co-discoverer [Donald Johanson](/wiki/Donald_Johanson "Donald Johanson") (born 1943), an American [paleoanthropologist](/wiki/Paleoanthropologist "Paleoanthropologist"). The approved naming citation was published by the [Minor Planet Center](/wiki/Minor_Planet_Center "Minor Planet Center") on 25 December 2015 ([M.P.C.](/wiki/Minor_Planet_Circulars "Minor Planet Circulars") 97569).[\[1\]](#cite_note-MPC-object-1)[\[11\]](#cite_note-MPC-Circulars-Archive-11)

## See also

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=7 "Edit section: See also")\]

- [Discovery program](/wiki/Discovery_program "Discovery program")

## References

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=8 "Edit section: References")\]

01. ^ [_**a**_](#cite_ref-MPC-object_1-0) [_**b**_](#cite_ref-MPC-object_1-1) [_**c**_](#cite_ref-MPC-object_1-2) [_**d**_](#cite_ref-MPC-object_1-3) [_**e**_](#cite_ref-MPC-object_1-4) [_**f**_](#cite_ref-MPC-object_1-5) [_**g**_](#cite_ref-MPC-object_1-6)["52246 Donaldjohanson (1981 EQ5)"](https://www.minorplanetcenter.net/db_search/show_object?object_id=52246). _Minor Planet Center_. Retrieved 28 April 2018.
02. ^ [_**a**_](#cite_ref-jpldata_2-0) [_**b**_](#cite_ref-jpldata_2-1) [_**c**_](#cite_ref-jpldata_2-2) [_**d**_](#cite_ref-jpldata_2-3) [_**e**_](#cite_ref-jpldata_2-4)["JPL Small-Body Database Browser: 52246 Donaldjohanson (1981 EQ5)"](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2052246) (2017-01-29 last obs.). [Jet Propulsion Laboratory](/wiki/Jet_Propulsion_Laboratory "Jet Propulsion Laboratory"). Retrieved 28 April 2018.
03. ^ [_**a**_](#cite_ref-Levison-2017_3-0) [_**b**_](#cite_ref-Levison-2017_3-1) [_**c**_](#cite_ref-Levison-2017_3-2) [_**d**_](#cite_ref-Levison-2017_3-3) [_**e**_](#cite_ref-Levison-2017_3-4)Levison, H. F.; Olkin, C.; Noll, K. S.; Marchi, S.; Lucy Team (March 2017). ["Lucy: Surveying the Diversity of the Trojan Asteroids: The Fossils of Planet Formation"](https://www.hou.usra.edu/meetings/lpsc2017/pdf/2025.pdf)(PDF). _48th Lunar and Planetary Science Conference_ (1964): 2025. [Bibcode](/wiki/Bibcode_(identifier) "Bibcode (identifier)"): [2017LPI....48.2025L](https://ui.adsabs.harvard.edu/abs/2017LPI....48.2025L). Retrieved 13 April 2017.
04. ^ [_**a**_](#cite_ref-Ferret_4-0) [_**b**_](#cite_ref-Ferret_4-1)["Asteroid 52246 Donaldjohanson – Nesvorny HCM Asteroid Families V3.0"](https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=52246+Donaldjohanson#Asteroid%2052246%20DonaldjohansonEAR-A-VARGBDET-5-NESVORNYFAM-V3.0). _Small Bodies Data Ferret_. Retrieved 27 October 2019.
05. ^ [_**a**_](#cite_ref-Masiero-2011_5-0) [_**b**_](#cite_ref-Masiero-2011_5-1) [_**c**_](#cite_ref-Masiero-2011_5-2)Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". _The Astrophysical Journal_. **741** (2): 20. [arXiv](/wiki/ArXiv_(identifier) "ArXiv (identifier)"):[1109.4096](https://arxiv.org/abs/1109.4096). [Bibcode](/wiki/Bibcode_(identifier) "Bibcode (identifier)"): [2011ApJ...741...68M](https://ui.adsabs.harvard.edu/abs/2011ApJ...741...68M). [doi](/wiki/Doi_(identifier) "Doi (identifier)"): [10.1088/0004-637X/741/2/68](https://doi.org/10.1088%2F0004-637X%2F741%2F2%2F68). [S2CID](/wiki/S2CID_(identifier) "S2CID (identifier)") [118745497](https://api.semanticscholar.org/CorpusID:118745497).
06. ^ [_**a**_](#cite_ref-Levison2021_6-0) [_**b**_](#cite_ref-Levison2021_6-1)Levison, Harold F.; Olkin, Catherine B.; Noll, Keith S.; Marchi, Simone; Bell III, James F.; Bierhaus, Edward; et al. (October 2021). ["Lucy Mission to the Trojan Asteroids: Science Goals"](https://doi.org/10.3847%2FPSJ%2Fabf840). _The Planetary Science Journal_. **2** (5): 13. [Bibcode](/wiki/Bibcode_(identifier) "Bibcode (identifier)"): [2021PSJ.....2..171L](https://ui.adsabs.harvard.edu/abs/2021PSJ.....2..171L). [doi](/wiki/Doi_(identifier) "Doi (identifier)"):[10.3847/PSJ/abf840](https://doi.org/10.3847%2FPSJ%2Fabf840).
07. ^ [_**a**_](#cite_ref-Nesvorny-2014_7-0) [_**b**_](#cite_ref-Nesvorny-2014_7-1)Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". _Asteroids IV_. pp. 297–321. [arXiv](/wiki/ArXiv_(identifier) "ArXiv (identifier)"):[1502.01628](https://arxiv.org/abs/1502.01628). [Bibcode](/wiki/Bibcode_(identifier) "Bibcode (identifier)"): [2015aste.book..297N](https://ui.adsabs.harvard.edu/abs/2015aste.book..297N). [doi](/wiki/Doi_(identifier) "Doi (identifier)"): [10.2458/azu\_uapress\_9780816532131-ch016](https://doi.org/10.2458%2Fazu_uapress_9780816532131-ch016). [ISBN](/wiki/ISBN_(identifier) "ISBN (identifier)") [9780816532131](/wiki/Special:BookSources/9780816532131 "Special:BookSources/9780816532131"). [S2CID](/wiki/S2CID_(identifier) "S2CID (identifier)") [119280014](https://api.semanticscholar.org/CorpusID:119280014).
08. ^ [_**a**_](#cite_ref-HST-16452_8-0) [_**b**_](#cite_ref-HST-16452_8-1)Noll, Keith (4 December 2020). ["Is the Lucy Mission Target (52246) Donaldjohanson a Binary?"](https://archive.stsci.edu/proposal_search.php?id=16452&mission=hst) (HST Proposal 16452). Mikulski Archive for Space Telescopes. Retrieved 28 September 2021.
09. **[^](#cite_ref-Ferrais2021_9-0)**Ferrais, Marin; Jehin, Emmanuel; Manfroid, Jean; Moulane, Youssef; Barkaoui, Khalid; Benkhaldoun, Zouhair (October 2021). [_Rotation period determination of NASA Lucy mission target (52246) Donaldjohanson_](https://submissions.mirasmart.com/DPS53/ViewSubmissionFile.aspx?sbmID=1226&mode=html&validate=false). 53rd Annual DPS Meeting. American Astronomical Society. 1226. Retrieved 28 September 2021.
10. **[^](#cite_ref-planetary.org_10-0)**Casey Dreier; Emily Lakdawalla (30 September 2015). ["NASA announces five Discovery proposals selected for further study"](http://www.planetary.org/blogs/casey-dreier/2015/09301336-discovery-downselect.html). The Planetary Society. Retrieved 12 April 2017.
11. **[^](#cite_ref-MPC-Circulars-Archive_11-0)**["MPC/MPO/MPS Archive"](https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html). _Minor Planet Center_. Retrieved 28 April 2018.

## External links

\[ [edit](/w/index.php?title=52246_Donaldjohanson&action=edit&section=9 "Edit section: External links")\]

- [Asteroid Lightcurve Database (LCDB)](http://www.minorplanet.info/PHP/lcdbsummaryquery.php), query form ( [info](http://www.minorplanet.info/lightcurvedatabase.html) [Archived](https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html) 16 December 2017 at the [Wayback Machine](/wiki/Wayback_Machine "Wayback Machine"))
- [Dictionary of Minor Planet Names](https://books.google.com/books?id=aeAg1X7afOoC&pg), Google books
- [Discovery Circumstances: Numbered Minor Planets (50001)-(55000)](https://www.minorplanetcenter.net/iau/lists/NumberedMPs050001.html) – Minor Planet Center
- [52246 Donaldjohanson](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.0) at _AstDyS-2, Asteroids—Dynamic Site_
  - [Ephemeris](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.3.0) **·** [Observation prediction](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.4.0) **·** [Orbital info](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.1) **·** [Proper elements](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.6) **·** [Observational info](https://newton.spacedys.com/astdys/index.php?n=52246&pc=1.1.7.0)
- [52246 Donaldjohanson](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246#content) at the _[JPL Small-Body Database](/wiki/JPL_Small-Body_Database "JPL Small-Body Database")_ [![Edit this at Wikidata](//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png)](https://www.wikidata.org/wiki/Q15163754#P716 "Edit this at Wikidata")
  - [Close approach](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246;cad=1#cad) **·** [Discovery](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246#discovery) **·** [Ephemeris](https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=20052246) **·** [Orbit diagram](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246&orb=1#orb) **·** [Orbital elements](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246#elem) **·** [Physical parameters](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246#phys_par)

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- **[52246 Donaldjohanson](/wiki/List_of_minor_planets:_52001%E2%80%9353000#246 "List of minor planets: 52001–53000")**

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Other

- [Cosmic dust](/wiki/Cosmic_dust "Cosmic dust")
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[Authority control databases](/wiki/Help:Authority_control "Help:Authority control")[![Edit this at Wikidata](//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png)](https://www.wikidata.org/wiki/Q15163754#identifiers "Edit this at Wikidata")

- [JPL SBDB](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=20052246)
- [MPC](https://www.minorplanetcenter.net/db_search/show_object?object_id=52246)

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