Astronomy:(98943) 2001 CC21
| Discovery[1][2] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab ETS |
| Discovery date | 3 February 2001 |
| Designations | |
| (98943) 2001 CC21 | |
| 1982 VE13[1] | |
| Minor planet category | NEO · Apollo |
| Orbital characteristics[3] | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 40.31 yr (14,725 days) |
| Earliest precovery date | 10 November 1982 |
| |{{{apsis}}}|helion}} | 1.259 AU |
| |{{{apsis}}}|helion}} | 0.806 AU |
| 1.032 AU | |
| Eccentricity | 0.2192 |
| Orbital period | 1.05 yr (383.1 d) |
| Mean anomaly | 280.856° |
| Mean motion | 0° 56m 23.328s / day |
| Inclination | 4.807° |
| Longitude of ascending node | 75.519° |
| 179.441° | |
| Earth MOID | 0.08303 AU (12,421,000 km) |
| Physical characteristics | |
| Mean diameter | 329+78 −41 m (NEOWISE)[4] 420–560 m (polarimetry)[5] |
| Rotation period | 5.0247±0.0001 h[6][7] |
| Geometric albedo | 0.285±0.083[5] |
| S | |
| Absolute magnitude (H) | 18.77[3][1] |
(98943) 2001 CC21 (provisional designation 2001 CC21) is a stony near-Earth asteroid of the Apollo group, with a diameter of about 500 metres (1,600 feet). It was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR) survey at Socorro, New Mexico on 3 February 2001.[1] It is an upcoming flyby target of JAXA's Hayabusa2 extended mission, which will approach less than 100 km (62 mi) from the asteroid in July 2026.[8][9]
Physical characteristics
Near-infrared spectroscopy of 2001 CC21 in 2023 shows that it is a stony S-type asteroid composed of silicates, with traces of pyroxene on its surface. These findings disprove earlier suggestions of an L-type asteroid spectrum, which lack pyroxene absorption bands by contrast.[5]
Rotation and light curve
2001 CC21's rotation period was first measured through photometric light curves in January 2002, which showed a periodicity of 5.02 hours.[7] Observations in 2003 and 2022 secured this period and refined it to 5.0247±0.0001 hours.[10][6] 2001 CC21 significantly varies in brightness by 0.8–1.1 magnitudes as it rotates, which indicates it has an elongated shape.[6][9]
Exploration
File:Animation of Hayabusa2 orbit - extended mission.webm In September 2020, a mission extension for JAXA's Hayabusa2 asteroid sample return probe was selected to do additional flybys of two near-Earth asteroids: 2001 CC21 in July 2026 and a rendezvous with 1998 KY26 in July 2031.[8][9] Hayabusa2 will flyby within 100 km (62 mi) of 2001 CC21 at a very high relative speed of 5 km/s (3.1 mi/s), which will pose a challenge for the spacecraft's navigation and tracking capabilities during the encounter.[9]
See also
- 162173 Ryugu, Hayabusa2's asteroid sample return target in 2018
- 1998 KY26, second asteroid flyby target of Hayabusa2 in 2031
References
- ↑ 1.0 1.1 1.2 1.3 "(98943) = 1982 VE13 = 2001 CC21". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=98943. Retrieved 6 April 2023.
- ↑ Spahr, Timothy B. (9 February 2001). "MPEC 2001-C19 : 2001 CC21". Minor Planet Electronic Circular (Minor Planet Center) 2001-C19. Bibcode: 2001MPEC....C...19T. https://minorplanetcenter.net/mpec/K01/K01C19.html. Retrieved 6 April 2023.
- ↑ 3.0 3.1 "Small-Body Database Lookup: 98943 (2001 CC21)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=20098943. Retrieved 6 April 2023.
- ↑ Wright, E.; Masiero, J.; Mainzer, A. (October 2023). "Preliminary Thermophysical Modeling of NEOWISE data on the Hayabusa2# Flyby Target 2001 CC21". 55th Annual DPS Meeting Joint with EPSC. 55. San Antonio, Texas. 107.03. https://submissions.mirasmart.com/DPS55/Itinerary/PresentationDetail.aspx?evdid=835.
- ↑ 5.0 5.1 5.2 Geem, JooyeonExpression error: Unrecognized word "etal". (April 2023). "Spectral type and geometric albedo of (98943) 2001 CC21, the Hayabusa2# mission target". Monthly Notices of the Royal Astronomical Society: Letters 525: L17–L21. doi:10.1093/mnrasl/slad073.
- ↑ 6.0 6.1 6.2 "LCDB Data for (98943) 2001 CC21". Asteroid Lightcurve Database (LCDB). Collaborative Asteroid Lightcurve Link. https://minplanobs.org/mpinfo/php/lcdbsummaryquery.php. Retrieved 6 April 2023.
- ↑ 7.0 7.1 Pravec, Petr. ""Prepublished" periods of asteroids". Ondrejov Asteroid Photometry Project. Astronomical Institute of the Czech Academy of Sciences. https://www.asu.cas.cz/~ppravec/newres.txt. Retrieved 6 April 2023.
- ↑ 8.0 8.1 Hirabayashi, M.Expression error: Unrecognized word "etal". (August 2021). "Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period". Advances in Space Research 68 (3): 1533–1555. doi:10.1016/j.asr.2021.03.030. Bibcode: 2021AdSpR..68.1533H.
- ↑ 9.0 9.1 9.2 9.3 Yoshikawa, Makoto; Mimasu, Yuya; Tanaka, Satoshi; Hirabayashi, Masatoshi; Saiki, Takanao; Nakazawa, Satoru; Tsuda, Yuichi (3 April 2023). "Hayabusa2 Extended Mission : Hayabusa2#". 8th IAA Planetary Defense Conference. Vienna, Austria. pp. 15. https://az659834.vo.msecnd.net/eventsairwesteuprod/production-atpi-public/9f51bd9e02dc448886f07de3809c04a4.
- ↑ Ries, J. G.; Varadi, F.; Barker, E. S.; Shelus, P. J. (September 2006). "Photometry of Near Earth Asteroids at McDonald Observatory". New Horizons in Astronomy: Frank N. Bash Symposium. 352. ASP Conference Series. pp. 4. Bibcode: 2006ASPC..352..273G. http://aspbooks.org/publications/352/273.pdf.
External links
- "Asteroid Explorer Hayabusa2". Institute of Space and Astronomical Science. Japan Aerospace Exploration Agency (JAXA). https://www.isas.jaxa.jp/en/missions/spacecraft/current/hayabusa2.html.
- (98943) 2001 CC21 at AstDyS-2, Asteroids—Dynamic Site
- (98943) 2001 CC21 at the JPL Small-Body Database
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