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) (Q)
Perihelion 42.400 AU (6.3429 Tm) (q)
98.438 AU (14.7261 Tm) (a)
Eccentricity 0.56927 (e)
976.67 yr (356730 d)
22.781° (M)
Inclination 20.8234° (i)
331.1519° (Ω)
324.37° (ω)
Earth MOID 41.4051 AU (6.19411 Tm)
Jupiter MOID 37.3733 AU (5.59097 Tm)
Physical characteristics
Dimensions 370–820 km[4][5]
612 km[6][7]
22.2[1][8]
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.[9]

    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.[6] However, because its albedo is unknown and it has an absolute magnitude of 4.3,[4] it could be anywhere between 370 to 820 km in diameter.[5]

    Distance

    2008 ST291, currently 59.0 AU from the Sun,[8] came to perihelion around 1954[4] and will have moved beyond a distance of 60 AU by 2016. It takes over one thousand years to orbit the Sun. Of the known and suspected dwarf planets, only Sedna 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 4 (0 being best; 9 being worst).[4]

    The orbit of 2008 ST291 compared to Pluto and Neptune
    Most-distant known trans-Neptunian objects (TNOs)
    in the Solar System as of 26 February 2016[10]
    Object name Distance from the Sun (AU) Magnitude
    (vmag)
    Current Perihelion Aphelion
    V774104 103 N/A N/A 24
    Eris 96.3 37.8 97.6 18.7
    2007 OR10 87.5 33.0 100.8 21.7
    Sedna 85.7 76.0 939 21.0
    2014 FC69 84.2 40.3 106.9 24.1
    2006 QH181 83.4 37.8 96.7 23.6
    2012 VP113 83.3 80.5 438 23.4
    2013 FY27 80.3 36.1 81.8 22.1
    2010 GB174 70.8 48.7 693 25.1
    2000 CR105 60.5 44.3 412 23.9
    2008 ST291 59.9 42.4 154.5 22.2
    2003 QX113 59.9 36.7 62.1 22.5
    Including all known objects currently located at least twice as far as Neptune.[10]
    See List of trans-Neptunian objects for more.

    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 7 "JPL Small-Body Database Browser: (2008 ST291)" (last observation: 2010-10-09; arc: 2.04 years). Retrieved 28 March 2016.
    5. 1 2 "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.
    6. 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.
    7. ↑ Assuming an albedo of 0.09
    8. 1 2 "AstDyS 2008 ST291 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2014-03-28.
    9. ↑ "How many dwarf planets are there in the outer solar system?". Gps.caltech.edu. 2015-07-21. Retrieved 2015-07-22.
    10. 1 2 "AstDyS-2, Asteroids - Dynamic Site". 2016-02-26. Retrieved 2016-02-29. Objects with distance from Sun over 59 AU

    External links

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