90377 Sedna

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Sedna seen through Hubble
Sedna as imaged bi the Hubble Space Telescope
Discovered bi Michael Brown
Chad Trujillo
David Rabinowitz
Discovery date November 14, 2003
MPC designation (90377) Sedna
Pronunciation /ˈsɛdnə/
Named after
2003 VB12
trans-Neptunian object
detached object
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][lower-alpha 1]
1.04 km/s
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]
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]
20.5 (perihelic)[10]

90377 Sedna 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.

Notes[eedit | eedit soorce]

  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[eedit | eedit soorce]

  1. "Discovery Circumstances: Numbered Minor Planets (90001)–(95000)". IAU: Minor Planet Center. Retrieved 2008-07-23. 
  2. 2.0 2.1 Marc W. Buie (2009-11-22). "Orbit Fit and Astrometric record for 90377". Deep Ecliptic Survey. Retrieved 2006-01-17. 
  3. 3.0 3.1 3.2 Horizons output. "Barycentric Osculating Orbital Elements for 90377 Sedna (2003 VB12)". Retrieved 2011-04-30.  (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0) (saved Horizons output file 2011-Feb-04). In the second pane "PR=" can be found, which gives the orbital period in days (4.15E+06, which is ~11400 Julian years).
  4. 4.0 4.1 4.2 4.3 "JPL Small-Body Database Browser: 90377 Sedna (2003 VB12)" (2012-10-16 last obs). Retrieved 2014-03-30. 
  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. Bibcode:2009ApJ...695..268K. arXiv:0901.1690. doi:10.1088/0004-637X/695/1/268. 
  6. 6.0 6.1 6.2 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. Bibcode:2012A&A...541L...6P. arXiv:1204.0899. doi:10.1051/0004-6361/201218874. 
  7. "Case of Sedna's Missing Moon Solved". Harvard-Smithsonian Center for Astrophysics. 2005-04-05. Retrieved 2005-04-07. 
  8. Stephen C. Tegler (2006-01-26). "Kuiper Belt Object Magnitudes and Surface Colors". Northern Arizona University. Retrieved 2006-11-05. 
  9. "AstDys (90377) Sedna Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2011-05-05. 
  10. JPL Horizons On-Line Ephemeris System (2010-07-18). "Horizons Output for Sedna 2076/2114". Retrieved 2010-07-18.  Horizons