2008 ST291

2008 ST₂₉₁
Discovery [1]
Discovered by	M. E. Schwamb; M. E. Brown; D. L. Rabinowitz
Discovery date	September 24, 2008
Designations
MPC designation	2008 ST291
Minor planet category	TNO (SDO)[2][3]; 6:1?[3]
Orbital characteristics [4]
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 4
Observation arc	3286 days (9.00 yr)
Aphelion	156.396 AU (23.3965 Tm)
Perihelion	42.271 AU (6.3237 Tm)
Semi-major axis	99.333 AU (14.8600 Tm)
Eccentricity	0.57445
Orbital period	990.04 yr (361611 d)
Mean anomaly	23.2101°
Mean motion	0.0009955°/day
Inclination	20.7849°
Longitude of ascending node	331.0475°
Argument of perihelion	324.3727°
Physical characteristics
Dimensions	612 km (est. at 0.09)[5]; 370–820 km (generic)[6]
Apparent magnitude	22.3[1][7]
Absolute magnitude (H)	4.2[4]

2008 ST₂₉₁, also written as 2008 ST291, is a trans-Neptunian object with an absolute magnitude of 4.2,^[4] making it possibly a dwarf planet.^[8] It is located near the 1:6 Neptune resonance of 99.4 AU (compared to its 99.3 ± 0.2 AU), meaning that it completes roughly 1 orbit for every 6 orbits Neptune makes.^[3]

Size estimate

2008 ST₂₉₁ is estimated to be about 612 kilometres (380 mi) in diameter, assuming a typical albedo of 0.09 for trans-Neptunian objects.^[5] However, because its albedo is unknown and it has an absolute magnitude of 4.2,^[4] it could be anywhere between 370 and 820 km in diameter.^[6]

Distance

Orbit comparison of 2008 ST₂₉₁, Pluto and Neptune

2008 ST₂₉₁, currently 60.9 AU from the Sun,^[7] came to perihelion in 1954.^[4] It takes almost one thousand years to orbit the Sun.

2008 ST₂₉₁ has only been observed 28 times over four oppositions and has an orbit quality of 4 (0 being best; 9 being worst).^[4]

Most-distant known objects in the Solar System as of 2 October 2018^[9]
Object name	Distance from the Sun (AU)			Apparent magnitude	Absolute magnitude (H)
Object name	Current	Perihelion	Aphelion	Apparent magnitude	Absolute magnitude (H)
V774104	103?	Unknown	Unknown	24	4
Eris	96.10	37.8	97.6	18.7	−1.1
2014 UZ224	90.70	38.0	179.8	23.2	3.5
2015 TH367	89.32	28.6	139.7	26.2	6.6
2007 OR₁₀	88.08	33.0	100.8	21.7	1.8
Sedna	85.00	76.0	939	21.0	1.5
2014 FC69	84.87	40.3	106.9	24.1	4.6
2013 FS28	84.55	34.6	347.6	24.5	4.9
2006 QH181	83.98	37.8	96.7	23.6	4.3
2012 VP113	83.72	80.5	438	23.4	4.0
2015 VO166	83.44	38.2	113	25.2	5.9
2015 UH87	81.80	34.7	90.1	25.3	6.0
2013 FY27	80.02	36.1	81.8	22.1	3.0
2015 TG387	78.65	64.9	2120	24.3	5.3
2017 FO161	78.57	33.1	93.9	24.2	5.2
2015 TJ367	78.25	33.5	127.5	25.7	6.7
2015 VJ168	72.90	37.4	81.3	24.6	5.8
2010 GB174	72.16	48.7	693	25.1	6.5
2015 GN55	71.56	32.7	78.4	24.5	5.8
2014 FJ72	71.41	38.7	152.2	24.2	5.6
2016 TS97	71.36	36.2	71.6	24.8	6.1
2015 VL168	70.86	37.6	136	25.3	6.1
2012 FH84	68.80	45.8	80.6	25.7	7.3
2015 RZ277	68.45	34.3	90.0	25.5	6.8
2015 GR50	68.41	35.6	78.6	25.1	6.7
2015 GP50	67.87	40.3	70.3	24.8	6.5
2013 FQ28	67.86	48.7	80.6	24.4	6.0
2016 CD289	66.66	36.8	75.3	25.6	7.3
2014 UD228	66.23	36.4	73.0	24.4	6.1
2015 KV167	65.16	38.2	65.3	25.4	7.2
2013 UJ15	65.06	36.3	69.2	25.2	7.0
2014 FL72	64.69	38.2	170.4	25.0	6.8
2014 FD70	64.51	38.6	69.3	25.0	6.9
2015 KG172	64.05	42.1	68.7	24.1	6.0
2014 SU349	63.50	30.8	109.8	25.0	7.0
2015 RL258	63.35	34.7	67.8	24.7	6.5
2015 KF172	63.23	38.2	102.8	23.6	5.5
2015 RR245	63.02	33.7	129.2	22.1	3.9
2011 GM89	62.87	37.2	68.8	25.6	7.1
2013 AT183	62.77	36.0	88.1	22.0	4.7
2014 FE72	62.47	36.3	4274.0	24.1	6.1
2017 DO121	62.00	26.7	185.6	25.6	7.6
2000 CR₁₀₅	61.85	44.3	412	23.9	6.3
2015 VG157	61.79	39.0	68.5	25.5	7.5
2014 SV349	61.57	34.2	89.0	23.0	5.0
2008 ST291	60.96	42.4	154.5	22.2	4.2
2015 RX245	60.76	45.5	768.9	24.2	6.2
2014 FM72	60.55	34.4	76.6	24.1	6.2
2017 DP121	60.33	40.5	60.4	25.1	7.2
2014 FF72	60.25	37.1	63.3	24.8	6.9
2003 QX113	60.16	36.7	62.1	22.5	4.7
2015 KH162	59.76	41.5	82.8	21.6	3.9
2015 FU403	59.75	34.0	88.4	25.3	7.5
2015 GW55	59.65	34.0	137.6	24.5	6.7
2013 JQ64	59.40	22.6	76.0	24.4	6.2
2015 RK258	59.03	35.8	111.8	24.9	7.1
This table includes all known objects currently located at least twice as far as Neptune.^[9] See List of trans-Neptunian objects for more.

References

1 2 "MPEC 2009-V68 : 2008 ST291". IAU Minor Planet Center. 2009-11-14. Retrieved 2009-12-06.
↑ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2009-12-06.
1 2 3 Marc W. Buie. "Orbit Fit and Astrometric record for 08ST291" (last observation: 2010-10-09 using 20 of 23 observations over 2.04 years). SwRI (Space Science Department). Retrieved 2009-12-06.
1 2 3 4 5 6 "JPL Small-Body Database Browser: (2008 ST291)" (last observation: 2017-09-23; arc: 9.00 years). Retrieved 31 July 2018.
1 2 Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). Archived from the original on 10 December 2008. Retrieved 2008-12-09.
1 2 "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.
1 2 "AstDyS 2008 ST291 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 31 July 2018.
↑ "How many dwarf planets are there in the outer solar system?". Gps.caltech.edu. 2015-07-21. Retrieved 20 September 2016.
1 2 "AstDyS-2, Asteroids - Dynamic Site". Retrieved 2018-04-03. Objects with distance from Sun over 59 AU

External links

2008 ST291 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[MPEC2009-V68-1] 1 2 "MPEC 2009-V68 : 2008 ST291". IAU Minor Planet Center. 2009-11-14. Retrieved 2009-12-06.

[MPC-2] "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2009-12-06.

[Buie-3] 1 2 3 Marc W. Buie. "Orbit Fit and Astrometric record for 08ST291" (last observation: 2010-10-09 using 20 of 23 observations over 2.04 years). SwRI (Space Science Department). Retrieved 2009-12-06.

[jpldata-4] 1 2 3 4 5 6 "JPL Small-Body Database Browser: (2008 ST291)" (last observation: 2017-09-23; arc: 9.00 years). Retrieved 31 July 2018.

[bruton-5] 1 2 Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). Archived from the original on 10 December 2008. Retrieved 2008-12-09.

[h-6] 1 2 "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.

[AstDyS-7] 1 2 "AstDyS 2008 ST291 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 31 July 2018.

[brown-8] "How many dwarf planets are there in the outer solar system?". Gps.caltech.edu. 2015-07-21. Retrieved 20 September 2016.

[AstDyS-distances-9] 1 2 "AstDyS-2, Asteroids - Dynamic Site". Retrieved 2018-04-03. Objects with distance from Sun over 59 AU

Dwarf planets
Asteroid belt	IAU: Ceres No longer rounded and therefore no longer dwarf planets (Vesta)
Centaurs	Possibly: Chariklo Chiron
Centaurs (extended)	Possibly: 1995 SN55 (lost) Ceto 2010 TY53
Plutinos	IAU: Pluto Additional objects proposed by Brown and Tancredi: Orcus Ixion 2003 AZ₈₄ 2004 UX₁₀ Huya Possibly: 2003 UZ₄₁₃ 2003 VS₂ 2002 VR₁₂₈ 2004 PF₁₁₅ 2002 XV93 2007 JH43 2001 QF298
Twotinos	Possibly: 2002 WC₁₉
Other resonances/ unknown resonances:	IAU: Haumea Possibly: 2002 XW₉₃ 1999 DE₉ 1999 KR₁₆ 2001 YH₁₄₀ 2011 GM27 2010 VK201 2013 FZ27 2014 UM33 1999 CD158
Cubewanos:	IAU: Makemake Additional objects proposed by Brown and Tancredi: 2002 MS₄ Salacia Quaoar Varuna Varda 2004 GV₉ 2002 AW₁₉₇ 2002 TX₃₀₀ 2005 RR₄₃ 2003 OP₃₂ 2005 RN₄₃ Possibly: Chaos Altjira Sila-Nunam 2002 UX₂₅ 2007 JJ₄₃ 2005 UQ₅₁₃ 2004 TY₃₆₄ 2003 QW₉₀ 1998 SN₁₆₅ 2002 KX₁₄ Praamzius 2004 NT₃₃ 2010 FX86 2002 CY248 2010 VR11 Rhadamanthus
Scattered disc	IAU: Eris Additional objects proposed by Brown and Tancredi: 2007 OR₁₀ 1996 TL₆₆ 2001 UR₁₆₃ 2005 RM₄₃ Possibly: 2002 TC₃₀₂ 2004 XA₁₉₂ 2005 QU₁₈₂ 2006 QH181 2007 UK₁₂₆ 2010 EK139 2010 KZ39 2010 RE64 2010 RF43 2010 TJ 2013 FY27 2008 OG19 1996 GQ₂₁ 2012 HH₂ 1999 CC₁₅₈ 2010 VZ98
Area uncertain	Captured satellites that were once dwarf planets: Triton (captured by Neptune) Phoebe (captured by Saturn, and no longer rounded) Possibly: 2011 FW62 (lost) 2000 YW₁₃₄ V774104
Detached objects	Possibly: 2004 XR190 2010 GB174 2008 ST291 1995 TL₈ 2005 TB₁₉₀ 2003 QX113 2003 FY₁₂₈ 2004 VN112 2000 CR₁₀₅
Sednoids	Objects proposed by Brown and Tancredi: Sedna Possibly: 2012 VP113
See also: Charon Vanth Dysnomia Hiʻiaka Mesoplanet Planemo List of trans-Neptunian objects List of possible dwarf planets List of Solar System objects List of Solar System objects by size

Discovery ^[1]
Discovered by	M. E. Schwamb M. E. Brown D. L. Rabinowitz
Discovery date	September 24, 2008
Designations
MPC designation	2008 ST₂₉₁
Minor planet category	TNO (SDO)^[2]^[3] 6:1?^[3]
Orbital characteristics ^[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 4
Observation arc	3286 days (9.00 yr)
Aphelion	156.396 AU (23.3965 Tm)
Perihelion	42.271 AU (6.3237 Tm)
Semi-major axis	99.333 AU (14.8600 Tm)
Eccentricity	0.57445
Orbital period	990.04 yr (361611 d)
Mean anomaly	23.2101°
Mean motion	0.0009955°/day
Inclination	20.7849°
Longitude of ascending node	331.0475°
Argument of perihelion	324.3727°
Physical characteristics
Dimensions	612 km (est. at 0.09)^[5] 370–820 km (generic)^[6]
Apparent magnitude	22.3^[1]^[7]
Absolute magnitude (H)	4.2^[4]

2008 ST291

Size estimate

Distance

See also

References

External links