90377 Sedna
asteroid
90377 Sedna (seembol: .svg){kind=small}
)[11] is a lairge minor planet in the ooter reaches o the Solar System that wis, as o 2015[update], at a distance o aboot 86 astronomical units (AU) frae the Sun, aboot three times as far as Neptune.
 Sedna as imaged by the Hubble Space Telescope | |
| Discovery[1] | |
|---|---|
| Discovered bi | Michael Brown Chad Trujillo David Rabinowitz |
| Discovery date | November 14, 2003 |
| Designations | |
| MPC designation | (90377) Sedna |
| Pronunciation | /ˈsɛdnə/ |
Named after | Sedna |
| 2003 VB12 | |
| trans-Neptunian object detached object sednoid[2] | |
| Orbital chairactereestics[4] | |
| Epoch 2014-Dec-09.0 (JD 2457000.5) | |
| Aphelion | ≈ 936 AU (Q)[3] 1.4×1011 km 0.015 ly |
| Perihelion | 76.0917±0.0087 AU (q) 1.1423×1010 km |
| 524.4±1.0 AU (a) 7.7576×1010 km | |
| Eccentricity | 0.85491±0.00029 |
| ≈ 11400 yr[3][a] | |
Average orbital speed | 1.04 km/s |
| 358.163°±0.0054° | |
| Inclination | 11.92864° |
| 144.545° (Ω) | |
| 311.29°±0.014° (ω) | |
| Pheesical chairacteristics | |
| Dimensions | 995±80 km (thermophysical model) 1060±100 km (standard thermal model)[6] |
Sidereal rotation period | 10.3 h ± 30%[4][7] |
| Albedo | 0.32±0.06 [6] |
| Temperatur | ≈ 12 K (see note) |
Spectral teep | (red) B−V=1.24; V−R=0.78[8] |
| 21.1[9] 20.5 (perihelic)[10] | |
| 1.83±0.05 [6] 1.5[4] | |
.svg){kind=small}
Notes
eedit- ↑ Gien the orbital eccentricity o this object, different epochs can generate quite different heliocentric unperturbed twa-body best-fit solutions tae the orbital period. Uisin a 1950 epoch, Sedna haes a 12,100-year period,[2] but uisin a 2010 epoch Sedna haes an 11,800-year period.[4] For objects at such heich eccentricity, the Sun's barycentric coordinates are mair stable nor heliocentric coordinates.[5] Uisin JPL Horizons, the barycentric orbital period is approximately 11,400 years.[3]
References
eedit- ↑ "Discovery Circumstances: Numbered Minor Planets (90001)–(95000)". IAU: Minor Planet Center. Retrieved 23 Julie 2008.
- ↑ a b Marc W. Buie (22 November 2009). "Orbit Fit and Astrometric record for 90377". Deep Ecliptic Survey. Retrieved 17 Januar 2006.
- ↑ a b c Horizons output. "Barycentric Osculating Orbital Elements for 90377 Sedna (2003 VB12)". Retrieved 30 Apryle 2011. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0) (saved Horizons output file 2011-Feb-04) Archived 2012-11-19 at the Wayback Machine. In the second pane "PR=" can be found, which gives the orbital period in days (4.15E+06, which is ~11400 Julian years).
- ↑ a b c d "JPL Small-Body Database Browser: 90377 Sedna (2003 VB12)" (2012-10-16 last obs). Retrieved 30 Mairch 2014.
- ↑ Kaib, Nathan A.; Becker, Andrew C.; Jones, R. Lynne; Puckett, Andrew W.; Bizyaev, Dmitry; Dilday, Benjamin; Frieman, Joshua A.; Oravetz, Daniel J.; Pan, Kaike; Quinn, Thomas; Schneider, Donald P.; Watters, Shannon (2009). "2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud". The Astrophysical Journal. 695 (1): 268–275. arXiv:0901.1690. Bibcode:2009ApJ...695..268K. doi:10.1088/0004-637X/695/1/268.CS1 maint: multiple names: authors leet (link)
- ↑ a b c Pál, A.; Kiss, C.; Müller, T. G.; Santos-Sanz, P.; Vilenius, E.; Szalai, N.; Mommert, M.; Lellouch, E.; Rengel, M.; Hartogh, P.; Protopapa, S.; Stansberry, J.; Ortiz, J. -L.; Duffard, R.; Thirouin, A.; Henry, F.; Delsanti, A. (2012). ""TNOs are Cool": A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139". Astronomy & Astrophysics. 541: L6. arXiv:1204.0899. Bibcode:2012A&A...541L...6P. doi:10.1051/0004-6361/201218874.
- ↑ "Case of Sedna's Missing Moon Solved". Harvard-Smithsonian Center for Astrophysics. 5 Apryle 2005. Retrieved 7 Apryle 2005.
- ↑ Stephen C. Tegler (26 Januar 2006). "Kuiper Belt Object Magnitudes and Surface Colors". Northern Arizona University. Retrieved 5 November 2006.
- ↑ "AstDys (90377) Sedna Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 5 Mey 2011.
- ↑ JPL Horizons On-Line Ephemeris System (18 Julie 2010). "Horizons Output for Sedna 2076/2114". Archived frae the original on 25 Februar 2012. Retrieved 18 Julie 2010. Horizons
- ↑ U+2BF2 ⯲. David Faulks (2016) 'Eris and Sedna Symbols,' L2/16-173R, Unicode Technical Committee Document Register.