90377 Sedna

Frae Wikipedia
Lowp tae: navigation, rake
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. arXiv:0901.1690Freely accessible. Bibcode:2009ApJ...695..268K. 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. arXiv:1204.0899Freely accessible. Bibcode:2012A&A...541L...6P. 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