2008 ST291

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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]
Orbital characteristics[4]
Epoch February 8, 2011
Aphelion 159.12 AU (Q)
Perihelion 42.61 AU (q)
100.86 AU (a)
Eccentricity 0.5775
1013 yr
19.961° (M)
Inclination 20.75°
330.98°
325.49°
Physical characteristics
Dimensions 370–820 km[4][5]
612 km[6][7]
22.2[8][1]
4.3[4]

2008 ST291, also written as 2008 ST291, is a trans-Neptunian object with an absolute magnitude of 4.3,[4] making it possibly a dwarf planet.

Distance[edit]

It came to perihelion around 1954[4] and is currently 59.0 AU from the Sun.[8] In 2016, it will move beyond 60 AU from the Sun.

It has only been observed 23 times over three oppositions and has an orbit quality of 4 (0 being best; 9 being worst).[4]

2008 ST291 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 a longer orbit around the Sun.

Assuming a generic trans-Neptunian albedo of 0.09, it is about 612 kilometres (380 mi) in diameter.[6] However, since its true albedo is unknown and it has an absolute magnitude of 4.3,[4] it could easily be somewhere between 370 to 820 km in diameter.[5]

References[edit]

  1. ^ a b "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. ^ a b c d e f g "JPL Small-Body Database Browser: (2008 ST291)" (last observation: 2010-10-09; arc: 2.04 years). Retrieved 2008-12-06. 
  5. ^ a b "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06. 
  6. ^ a b 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. ^ a b "AstDyS 2008 ST291 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2014-03-28. 

External links[edit]