(469306) 1999 CD158

(469306) 1999 CD158, provisional designation 1999 CD158, is a resonant trans-Neptunian object and possible dwarf planet from the circumstellar disc of the Kuiper belt in the outer Solar System, approximately 440 kilometers in diameter.

(469306) 1999 CD158
Discovery [1]
Discovered byJ. X. Luu
D. C. Jewitt
C. Trujillo
Discovery siteMauna Kea Obs.
Discovery date10 February 1999
Designations
(469306) 1999 CD158
1999 CD158
TNO [1] · 4:7 resonance [2]
distant [3] · detached [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc16.18 yr (5,908 days)
Aphelion50.139 AU
Perihelion37.410 AU
43.775 AU
Eccentricity0.1454
289.63 yr (105,787 days)
250.48°
0° 0m 12.24s / day
Inclination25.486°
119.03°
≈ 17 February 2107[5]
±3 days
143.51°
Physical characteristics
Dimensions420.27 km (calculated)[6]
440 km[2]
477 km (estimated)[7]
6.88±0.02 h[8]
0.10 (assumed)[6]
IR [2][9] · C [6]
B–V = 0.770[10] · 0.830[11] · 0.864[12] · 0.860[9]
V–R = 0.630[10] · 0.510[11] · 0.520[12] · 0.520[9]
V–I = 1.110[10] · 1.092[12] · 1.100[9]
21.8[13]
4.837±0.111 (R)[14] · 5.0[1][6]

    It was discovered on 10 February 1999, by astronomers Jane Luu, David Jewitt and Chad Trujillo at Mauna Kea Observatories on the Big Island of Hawaii, United States.[3]

    Orbit and classification

    1999 CD158 is candidate to the Haumea family, the only collisional group of trans-Neptunian objects currently determined.[8] It is also sub-classified as a resonant trans-Neptunian object, as it stays in a 4:7 orbital resonance with the ice giant Neptune, which means, that for every seven orbits of Neptune around the Sun, it makes four orbits. It orbits the Sun at a distance of 37.4–50.1 AU once every 289 years and 8 months (105,787 days). Its orbit has an eccentricity of 0.15 and an inclination of 25° with respect to the ecliptic.[1]

    Its observation arc begins with its official discovery observation at Mauna Kea in 1999, as no precoveries were taken and no prior identifications were made.[3] As of 2017 its current position is at 46.7 AU from the Sun.[15]

    Physical characteristics

    Photometry

    Photometric observation of 1999 CD158 in March 2015, gave a classically shaped bimodal lightcurve with a rotation period of 6.88 hours and a large brightness variation of 0.49 magnitude (U=3-).[8]

    Observations with the New Technology Telescope at ESO's La Silla Observatory in Chile in 2008, determined the body's BVRI colors to be 0.770 (B–V), 0.630 (V–R) and 1.110 (V–I) for their respective passbands.[10] Color indices have since been repeatedly measured.[6]

    Diameter and albedo

    According to estimates by the Johnston's archive, the Collaborative Asteroid Lightcurve Link and American astronomer Michael Brown, 1999 CD158 measures between 420 and 477 kilometers in diameter.[6][2][7] It is "probably" a dwarf planet" according to Brown's assessment (see List of possible dwarf planets § List).[7]

    Naming

    As of 2018, this minor planet remains unnamed.[3]

    References
    1. "JPL Small-Body Database Browser: 469306 (1999 CD158)" (2015-04-15 last obs.). Jet Propulsion Laboratory. Retrieved 2 June 2017.
    2. "List of known trans-Neptunian objects". Johnstonsarchive.net. 5 September 2016. Retrieved 2 June 2017.
    3. "469306 (1999 CD158)". Minor Planet Center. Retrieved 16 March 2017.
    4. Marc W. Buie (2012-02-04). "Orbit Fit and Astrometric record for 99CD158". SwRI (Space Science Department). Archived from the original on 2016-06-16. Retrieved 2012-02-04.
    5. JPL Horizons Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)
    6. "LCDB Data for (469306)". Asteroid Lightcurve Database (LCDB). Retrieved 16 March 2017.
    7. Michael E. Brown (February 3, 2012). "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 16 March 2017.
    8. Thirouin, Audrey; Sheppard, Scott S.; Noll, Keith S.; Moskovitz, Nicholas A.; Ortiz, Jose Luis; Doressoundiram, Alain (June 2016). "Rotational Properties of the Haumea Family Members and Candidates: Short-term Variability". The Astronomical Journal. 151 (6): 20. arXiv:1603.04406. Bibcode:2016AJ....151..148T. doi:10.3847/0004-6256/151/6/148. Retrieved 16 March 2017.
    9. Belskaya, Irina N.; Barucci, Maria A.; Fulchignoni, Marcello; Dovgopol, Anatolij N. (April 2015). "Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo". Icarus. 250: 482–491. Bibcode:2015Icar..250..482B. doi:10.1016/j.icarus.2014.12.004. Retrieved 16 March 2017.
    10. Snodgrass, C.; Carry, B.; Dumas, C.; Hainaut, O. (February 2010). "Characterisation of candidate members of (136108) Haumea's family". Astronomy and Astrophysics. 511: 9. arXiv:0912.3171. Bibcode:2010A&A...511A..72S. doi:10.1051/0004-6361/200913031. Retrieved 16 March 2017.
    11. Carry, B.; Snodgrass, C.; Lacerda, P.; Hainaut, O.; Dumas, C. (August 2012). "Characterisation of candidate members of (136108) Haumea's family. II. Follow-up observations". Astronomy and Astrophysics. 544: 7. arXiv:1207.6491. Bibcode:2012A&A...544A.137C. doi:10.1051/0004-6361/201219044. Retrieved 16 March 2017.
    12. Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 16 March 2017.
    13. AstDys Summary for 1999 CD158, retrieved 2012-02-04
    14. Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects". Astronomy and Astrophysics. 546: 12. arXiv:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. Retrieved 16 March 2017.
    15. AstDys Ephmerides for 1999 CD158, retrieved 2012-02-04
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