(26308) 1998 SM165

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(26308) 1998 SM165
Synodic rotation period
8.40±0.05 h[6]
0.07±0.02[6]
5.7[2]

(26308) 1998 SM165 is a resonant

twotino and measures approximately 280 kilometers in diameter. Its minor-planet moon was discovered in 2001.[5]

Twotino

The orbit of 1998 SM165 compared to Pluto and Neptune

1998 SM165 has a

twotino that stays in a 1:2 orbital resonance with the planet Neptune (for every one orbit that a twotino makes, Neptune orbits twice).[3][4]

Physical characteristics

The observations with the infrared Spitzer Space Telescope combined with the orbits established using the Hubble Space Telescope allow the estimation of the density, assuming the components of equal albedo.

The resulting estimate of 0.51+0.29
−0.14 g/cm3[6] is similar to the density of the binary plutino 47171 Lempo (0.3–0.8 g/cm3[7]) and Saturn's moon Hyperion (0.567±0.102 g/cm3[8]) Such a low density is indicative of a highly porous composition dominated by ice.[6]

1998 SM165 is fairly red, with a color comparable to 79360 Sila–Nunam.

Satellite

On 22 December 2001, a minor-planet moon, provisionally designated S/2001 (26308) 1, was discovered by American astronomer Michael Brown and Chad Trujillo using the Hubble Space Telescope.[5] The discovery was announced in January 2002. The satellite measures approximately 96 ± 12 km (59.7 ± 7.5 mi) in diameter and orbits its primary at a distance of 11,310 ± 110 km (7,028 ± 68 mi). Assuming a circular orbit, this takes 130.1±1 days to complete one orbit.[5]

Numbering and naming

This

numbered by the Minor Planet Center on 5 July 2001.[9] As of 2018, it has not been named.[1]

References

  1. ^ a b c d "26308 (1998 SM165)". Minor Planet Center. Retrieved 11 October 2017.
  2. ^ a b c "JPL Small-Body Database Browser: 26308 (1998 SM165)" (2015-01-16 last obs.). Jet Propulsion Laboratory. Retrieved 11 October 2017.
  3. ^ a b "MPEC 2009-J35 :Distant Minor Planets (2009 MAY 29.0 TT)". Minor Planet Center. 8 May 2009. Retrieved 22 August 2016.
  4. ^
    Marc W. Buie. "Orbit Fit and Astrometric record for 26308"
    (2007/09/11 using 73 observations). SwRI (Space Science Department). Retrieved 12 May 2009.
  5. ^ a b c d e f g "(26308) 1998 SM165 and S/2001 (26308) 1". johnstonsarchive. 21 September 2014. Retrieved 11 October 2017.
  6. ^
    Bibcode:2006DPS....38.3401S
    .
  7. S2CID 18146599
    .
  8. doi:10.1086/508812
    .
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

External links

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