90377 Sedna

Sedna
	Sedna as imaged by the Hubble Space Telescope
Discovery
Discovered bi	Michael Brown; Chad Trujillo; David Rabinowitz
Discovery date	November 14, 2003
Designations
MPC designation	(90377) Sedna
Pronunciation	/ˈsɛdnə/
Named after	Sedna
Alternative names	2003 VB12
Minor planet category	trans-Neptunian object; detached object; sednoid
Orbital chairactereestics
	Epoch 2014-Dec-09.0 (JD 2457000.5)
Aphelion	≈ 936 AU (Q); 1.4×1011 km; 0.015 ly
Perihelion	76.0917±0.0087 AU (q); 1.1423×1010 km
Semi-major axis	524.4±1.0 AU (a); 7.7576×1010 km
Eccentricity	0.85491±0.00029
Orbital period	≈ 11400 yr
Average orbital speed	1.04 km/s
Mean anomaly	358.163°±0.0054°
Inclination	11.92864°
Longitude o ascendin node	144.545° (Ω)
Argument o perihelion	311.29°±0.014° (ω)
Pheesical chairacteristics
Dimensions	995±80 km; (thermophysical model); 1060±100 km; (standard thermal model)
Sidereal rotation period	10.3 h ± 30%
Albedo	0.32±0.06
Temperatur	≈ 12 K (see note)
Spectral teep	(red) B−V=1.24; V−R=0.78
Apparent magnitude	21.1; 20.5 (perihelic)
Absolute magnitude (H)	1.83±0.05 ; 1.5

90377 Sedna (seembol: )^[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.

Notes

↑ 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

↑ "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.

[footnoteG-6] 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]

[discovery-1] "Discovery Circumstances: Numbered Minor Planets (90001)–(95000)". IAU: Minor Planet Center. Retrieved 23 Julie 2008.

[DES-2] Marc W. Buie (22 November 2009). "Orbit Fit and Astrometric record for 90377". Deep Ecliptic Survey. Retrieved 17 Januar 2006.

[barycenter-3] 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).

[jpldata-4] "JPL Small-Body Database Browser: 90377 Sedna (2003 VB12)" (2012-10-16 last obs). Retrieved 30 Mairch 2014.

[Kaib2009-5] 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)

[herschel-7] 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.

[pr200510-8] "Case of Sedna's Missing Moon Solved". Harvard-Smithsonian Center for Astrophysics. 5 Apryle 2005. Retrieved 7 Apryle 2005.

[Tegler-9] Stephen C. Tegler (26 Januar 2006). "Kuiper Belt Object Magnitudes and Surface Colors". Northern Arizona University. Retrieved 5 November 2006.

[AstDys-10] "AstDys (90377) Sedna Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 5 Mey 2011.

[Horizons2076-11] 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

[12] U+2BF2 ⯲. David Faulks (2016) 'Eris and Sedna Symbols,' L2/16-173R, Unicode Technical Committee Document Register.

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