90377 Sedna

asteroid

90377 Sedna (seembol: ⯲)[11] is a lairge minor planet in the ooter reaches o the Solar System that wis, as o 2015, at a distance o aboot 86 astronomical units (AU) frae the Sun, aboot three times as far as Neptune.

Sedna ⯲
Sedna seen through Hubble
Sedna as imaged by the Hubble Space Telescope
Discovery[1]
Discovered biMichael Brown
Chad Trujillo
David Rabinowitz
Discovery dateNovember 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
Perihelion76.0917±0.0087 AU (q)
1.1423×1010 km
524.4±1.0 AU (a)
7.7576×1010 km
Eccentricity0.85491±0.00029
≈ 11400 yr[3][a]
1.04 km/s
358.163°±0.0054°
Inclination11.92864°
144.545° (Ω)
311.29°±0.014° (ω)
Pheesical chairacteristics
Dimensions995±80 km
(thermophysical model)
1060±100 km
(standard thermal model)[6]
10.3 h ± 30%[4][7]
Albedo0.32±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]

Notes

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  1. 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

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  1. "Discovery Circumstances: Numbered Minor Planets (90001)–(95000)". IAU: Minor Planet Center. Retrieved 23 Julie 2008.
  2. a b Marc W. Buie (22 November 2009). "Orbit Fit and Astrometric record for 90377". Deep Ecliptic Survey. Retrieved 17 Januar 2006.
  3. 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).
  4. a b c d "JPL Small-Body Database Browser: 90377 Sedna (2003 VB12)" (2012-10-16 last obs). Retrieved 30 Mairch 2014.
  5. 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)
  6. 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.
  7. "Case of Sedna's Missing Moon Solved". Harvard-Smithsonian Center for Astrophysics. 5 Apryle 2005. Retrieved 7 Apryle 2005.
  8. Stephen C. Tegler (26 Januar 2006). "Kuiper Belt Object Magnitudes and Surface Colors". Northern Arizona University. Retrieved 5 November 2006.
  9. "AstDys (90377) Sedna Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 5 Mey 2011.
  10. 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
  11. U+2BF2 ⯲. David Faulks (2016) 'Eris and Sedna Symbols,' L2/16-173R, Unicode Technical Committee Document Register.