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
TNO (SDO)[2][3]
Orbital characteristics [4]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 5
Observation arc 745 days (2.04 yr)
Aphelion 154.47 AU (23.108 Tm)
Perihelion 42.400 AU (6.3429 Tm)
98.438 AU (14.7261 Tm)
Eccentricity 0.56927
976.67 yr (356730 d)
22.781°
0.0010092°/day
Inclination 20.8234°
331.1519°
324.37°
Physical characteristics
Dimensions 612 km (est. at 0.09)[5]
370–820 km (generic)[6]
22.2[1][7]
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]

    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 60.1 AU from the Sun,[7] came to perihelion around 1954.[4] It takes over one thousand years to orbit the Sun. Of the known and suspected dwarf planets, only Sedna, 2012 VP113 and 2005 QU182 are known to have longer orbits.

    2008 ST291 has only been observed 26 times over three oppositions and has an orbit quality of 5 (0 being best; 9 being worst).[4]

    See also

    References

    1. 1 2 "MPEC 2009-V68 : 2008 ST291". IAU Minor Planet Center. 2009-11-14. Retrieved 2009-12-06.
    2. ↑ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2009-12-06.
    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.
    4. 1 2 3 4 5 6 "JPL Small-Body Database Browser: (2008 ST291)" (last observation: 2010-10-09; arc: 2.04 years). Retrieved 28 March 2016.
    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.
    6. 1 2 "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.
    7. 1 2 "AstDyS 2008 ST291 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2016-10-10.
    8. ↑ "How many dwarf planets are there in the outer solar system?". Gps.caltech.edu. 2015-07-21. Retrieved 20 September 2016.
    9. 1 2 "AstDyS-2, Asteroids - Dynamic Site". 2016-02-26. Retrieved 2017-02-04. Objects with distance from Sun over 59 AU
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