(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 | |
| (79983) 1999 DF9 | |
| 1999 DF9 | |
| TNO[1] · cubewano[2][3] | |
| 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 km (calculated)[4] 306 km[3] |
| 6.65 h[5] | |
| 0.10 (assumed)[4] | |
| B–V = 0.920±0.060[6] V–R = 0.710±0.050[6] V–I = 1.360±0.060[6] | |
| 5.797±0.110 (R)[7] · 6.0[1][4] | |
(79983) 1999 DF9 (provisional designation 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
[edit]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.[8] As no precoveries were taken, the minor planet's observation arc begins with its discovery observation in 1999.[8]
Classification and orbit
[edit]The 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
[edit]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 6.65 hours with a brightness variation of 0.40 magnitude (U=2).[5]
The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a mean-diameter of 265 kilometers, based on an absolute magnitude of 6.0,[4] while the Johnston's archive give a diameter of 306 kilometers for an albedo of 0.09.[3] Mike Brown's official website lists it as a possible dwarf planet
Numbering and naming
[edit]This minor planet was numbered by the Minor Planet Center on 4 May 2004.[9] As of 2018, it has not been named.[8]
References
[edit]- ^ a b c d e "JPL Small-Body Database Browser: 79983 (1999 DF9)" (13 March 2016 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2017.
- ^ Marc W. Buie. "Orbit Fit and Astrometric record for 79983". SwRI (Space Science Department). Retrieved 17 February 2018.
- ^ a b c Robert Johnston (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 12 November 2018.
- ^ a b c d "LCDB Data for (79983)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016.
- ^ a b Lacerda, Pedro; Luu, Jane (April 2006). "Analysis of the Rotational Properties of Kuiper Belt Objects". The Astronomical Journal. 131 (4): 2314–2326. arXiv:astro-ph/0601257. Bibcode:2006AJ....131.2314L. doi:10.1086/501047. S2CID 14950702.
- ^ a b c 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. S2CID 54776793.
- ^ 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. S2CID 55876118.
- ^ a b c "79983 (1999 DF9)". Minor Planet Center. Retrieved 31 August 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
External links
[edit]- List Of Transneptunian Objects, Minor Planet Center
- https://newton.spacedys.com/cgi-bin/astdys/astibo?objects:1999DF9;main[permanent dead link]
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (75001)-(80000) – Minor Planet Center
- (79983) 1999 DF9 at AstDyS-2, Asteroids—Dynamic Site
- (79983) 1999 DF9 at the JPL Small-Body Database
