(79983) 1999 DF9
Discovery [1] | |
---|---|
Discovered by |
J. X. Luu C. Trujillo D. C. Jewitt |
Discovery site | Kitt Peak National Obs. |
Discovery date | 20 February 1999 |
Designations | |
MPC designation | (79983) 1999 DF9 |
1999 DF9 | |
TNO [1] · cubewano [2] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 2 | |
Observation arc | 17.06 yr (6,231 days) |
Aphelion | 53.567 AU |
Perihelion | 39.830 AU |
46.698 AU | |
Eccentricity | 0.1471 |
319.12 yr (116,560 days) | |
19.489° | |
0° 0m 11.16s / day | |
Inclination | 9.8105° |
334.84° | |
178.63° | |
Physical characteristics | |
Dimensions |
265.17 km (calculated)[3] 278 km[2] |
6.65h[4] | |
0.10 (assumed)[3] | |
C [3] B–V = ±0.060 0.920[5] V–R = ±0.050 0.710[5] V–I = ±0.060 1.360[5] | |
±0.110 (R) 5.797[6] · 6.0[1][3] | |
|
(79983) 1999 DF9 is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 270 kilometers in diameter.
Discovery
It was discovered on 20 February 1999, by American and British astronomers Jane Luu, Chad Trujillo and David C. Jewitt at the U.S. Kitt Peak National Observatory in Arizona.[7] As no precoveries were taken, the minor planet's observation arc begins with its discovery observation in 1999.[7]
Classification and orbit
The carbonaceous minor planet is a classical Kuiper belt object or "cubewano", which are not in an orbital resonance with Neptune and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.6 AU once every 319 years and 1 month (116,560 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic.[1] This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less.
Physical characteristics
In February 2001, a rotational lightcurve was published for this minor planet from photometric observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Jane Luu. Lightcurve analysis gave a relatively short rotation period of hours with a brightness variation of 0.40 6.65magnitude (U=2).[4]
The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a mean-diameter of 265.2 kilometers, based on an absolute magnitude of 6.0,[3] while the Johnston's archive give a diameter of 278 kilometers.[2] Due to its small size, it is unlikely to be classified as a dwarf planet.
Naming
As of 2017, this minor planet remains unnamed.[7]
References
- 1 2 3 4 5 "JPL Small-Body Database Browser: 79983 (1999 DF9)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2017.
- 1 2 3 Robert Johnston (5 September 2016). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 25 April 2017.
- 1 2 3 4 5 "LCDB Data for (79983)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016.
- 1 2 Lacerda, Pedro; Luu, Jane (April 2006). "Analysis of the Rotational Properties of Kuiper Belt Objects" (PDF). The Astronomical Journal. 131 (4): 2314–2326. Bibcode:2006AJ....131.2314L. arXiv:astro-ph/0601257 . doi:10.1086/501047. Retrieved 31 August 2016.
- 1 2 3 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. Bibcode:2012A&A...546A.115H. arXiv:1209.1896 . doi:10.1051/0004-6361/201219566. Retrieved 31 August 2016.
- ↑ Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects" (PDF). Astronomy and Astrophysics. 546: 12. Bibcode:2012A&A...546A..86P. arXiv:1206.3153 . doi:10.1051/0004-6361/201219057. Retrieved 31 August 2016.
- 1 2 3 "79983 (1999 DF9)". Minor Planet Center. Retrieved 31 August 2016.
External links
- List Of Transneptunian Objects, Minor Planet Center
- http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:1999DF9;main
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (75001)-(80000) – Minor Planet Center
- (79983) 1999 DF9 at the JPL Small-Body Database