| Discovery [1] [2] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab ETS |
| Discovery date | 3 February 2001 |
| Designations | |
| (98943) 2001 CC21 | |
| 1982 VE13 [1] | |
| 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 |
| Aphelion | 1.259 AU |
| Perihelion | 0.806 AU |
| 1.032 AU | |
| Eccentricity | 0.2192 |
| 1.05 yr (383.1 d) | |
| 280.856 ° | |
| 0° 56m 23.328s / day | |
| Inclination | 4.807° |
| 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] |
| 5.0247±0.0001 h [6] [7] | |
| 0.285±0.083 [5] | |
| S | |
| 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
Hayabusa2 · 162173 Ryugu · Earth · Sun · 2001 CC21 · 1998 KY26
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
- ^ a b c d "(98943) = 1982 VE13 = 2001 CC21". Minor Planet Center. Retrieved 6 April 2023.
- ^ Spahr, Timothy B. (9 February 2001). "MPEC 2001-C19 : 2001 CC21". Minor Planet Electronic Circular. 2001-C19. Minor Planet Center. Bibcode: 2001MPEC....C...19T. Retrieved 6 April 2023.
- ^ a b "Small-Body Database Lookup: 98943 (2001 CC21)" (2023-03-05 last obs.). Jet Propulsion Laboratory. 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. Vol. 55. San Antonio, Texas. 107.03.
- ^ a b c Geem, Jooyeon; Ishiguro, Masateru; Granvik, Mikael; Naito, Hiroyuki; Akitaya, Hiroshi; Sekiguchi, Tomohiko; et al. (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. arXiv: 2304.02917. doi: 10.1093/mnrasl/slad073.
- ^ a b c "LCDB Data for (98943) 2001 CC21". Asteroid Lightcurve Database (LCDB). Collaborative Asteroid Lightcurve Link. Retrieved 6 April 2023.
- ^ a b Pravec, Petr. ""Prepublished" periods of asteroids". Ondrejov Asteroid Photometry Project. Astronomical Institute of the Czech Academy of Sciences. Retrieved 6 April 2023.
- ^ a b Hirabayashi, M.; Mimasu, Y.; Sakatani, N.; Watanabe, S.; Tsuda, Y.; Saiki, T.; et al. (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. arXiv: 2104.08660. Bibcode: 2021AdSpR..68.1533H. doi: 10.1016/j.asr.2021.03.030. S2CID 233297066.
- ^ a b c d Yoshikawa, Makoto; Mimasu, Yuya; Tanaka, Satoshi; Hirabayashi, Masatoshi; Saiki, Takanao; Nakazawa, Satoru; Tsuda, Yuichi; et al. (3 April 2023). Hayabusa2 Extended Mission : Hayabusa2#. 8th IAA Planetary Defense Conference. Vienna, Austria. p. 15. Archived from the original on 7 April 2023.
- ^ Ries, J. G.; Varadi, F.; Barker, E. S.; Shelus, P. J. (September 2006). Photometry of Near Earth Asteroids at McDonald Observatory (PDF). New Horizons in Astronomy: Frank N. Bash Symposium. Vol. 352. ASP Conference Series. p. 4. Bibcode: 2006ASPC..352..273G.
External links
- "Asteroid Explorer Hayabusa2". Institute of Space and Astronomical Science. Japan Aerospace Exploration Agency (JAXA).
- (98943) 2001 CC21 at AstDyS-2, Asteroids—Dynamic Site
- (98943) 2001 CC21 at the JPL Small-Body Database
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