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	( 90 377 ) Sedna
Pronunciation	/ ? s ? d n ? /
Named after	Sedna
Alternative names	2003 VB 12
Minor planet category	trans-Neptunian object ; detached object ; sednoid
Orbital chairactereestics
	Epoch 2014-Dec-09.0 ( JD 2 457 000 .5 )
Aphelion	? 936 AU (Q) ; 1.4 × 10 11 km ; 0.015 ly
Perihelion	76.0917 ± 0.0087 AU (q) ; 1.1423 × 10 10 km
Semi-major axis	524.4 ± 1.0 AU (a) ; 7.7576 × 10 10 km
Eccentricity	0.854 91 ± 0.000 29
Orbital period	? 11 400 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 [ eedit | eedit soorce ]

↑ 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 ]

↑ "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 Pal, A.; Kiss, C.; Muller, 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 EK ₁₃₉". 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] Pal, A.; Kiss, C.; Muller, 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 EK ₁₃₉". 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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