(26308) 1998 SM165

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(26308) 1998 SM165
Discovery [1]
Discovered by Nichole M. Danzl
Discovery date 16 September 1998
Designations
MPC designation (26308) 1998 SM165
none
twotino[2][3]
Kozai
Orbital characteristics[6]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc 9952 days (27.25 yr)
Aphelion 64.984 AU (9.7215 Tm)
Perihelion 29.9586 AU (4.48174 Tm)
47.4715 AU (7.10164 Tm)
Eccentricity 0.36891
327.08 yr (119467 d)
4.17 km/s
45.5335°
0° 0m 10.848s / day
Inclination 13.5226°
183.214°
130.560°
Known satellites S/2001 (26308) 1[4]
(96±12 km in diameter)[5]
Earth MOID 28.9596 AU (4.33229 Tm)
Jupiter MOID 24.9916 AU (3.73869 Tm)
Physical characteristics
Dimensions 287±36 km (primary)[5]
Mean density
0.51+0.29
−0.14
 g/cm3
[5]
8.40±0.05 h[5]
0.07±0.02[5]
Temperature ~ 40 K
5.8

(26308) 1998 SM165, also written as (26308) 1998 SM165, is a binary trans-Neptunian object (TNO) that resides in the Kuiper belt. It was discovered on September 16, 1998, by Nichole Danzl. It is in a 1:2 orbital resonance with the planet Neptune.

Twotino[edit]

The orbit of twotino 1998 SM165 compared to Pluto and Neptune

1998 SM165 has a semi-major axis (average distance from the Sun) near the edge of the classical belt. Both the Minor Planet Center (MPC) and the Deep Ecliptic Survey (DES) list this trans-Neptunian object as a twotino.[2][3] For every one orbit that a twotino makes, Neptune orbits twice.

Physical characteristics[edit]

The observations with the infrared Spitzer Space Telescope combined with the orbits established using the Hubble 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
[5] is similar to the density of the binary plutino (47171) 1999 TC36 (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.[5]

(26308) 1998 SM165 is fairly red, with a color comparable to 79360 Sila–Nunam.

Satellite[edit]

Designated S/2001 (26308) 1, it is about 96 ± 12 km (59.7 ± 7.5 mi) in diameter and it 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.[4]

References[edit]

  1. ^ "List Of Transneptunian Objects". Minor Planet Center. Retrieved 22 August 2016. 
  2. ^ a b "MPEC 2009-J35 :Distant Minor Planets (2009 MAY 29.0 TT)". Minor Planet Center. 2009-05-08. Retrieved 22 August 2016. 
  3. ^ a b Marc W. Buie. "Orbit Fit and Astrometric record for 26308" (2007/09/11 using 73 observations). SwRI (Space Science Department). Retrieved 2009-05-12. 
  4. ^ a b "(26308) 1998 SM165 and S/2001 (26308) 1". johnstonsarchive. 
  5. ^ a b c d e f g Spencer, J.; Stansberry, J.; Grundy, W.; Noll, K. (September 2006). "A Low Density for Binary Kuiper Belt Object (26308) 1998 SM165". Bulletin of the American Astronomical Society. American Astronomical Society. 38: 546. Bibcode:2006DPS....38.3401S. 
  6. ^ "26308 (1998 SM165)". JPL Small-Body Database Browser (2010-01-10 last obs). Retrieved 5 April 2016. 
  7. ^ Stansberry, J.; Grundy, W.; Margot, J-L.; Cruikshank, D.; Emery, J.; Rieke, G.; Trilling, D. (May 2006). "The Albedo, Size, and Density of Binary Kuiper Belt Object (47171) 1999 TC36". The Astrophysical Journal. 643. arXiv:astro-ph/0602316Freely accessible. Bibcode:2006ApJ...643..556S. doi:10.1086/502674. 
  8. ^ Jacobson, R. A.; Antreasian, P. G.; Bordi, J. J.; Criddle, K. E.; Ionasescu, R.; Jones, J. B.; Mackenzie, R. A.; Meek, M. C.; Parcher, D.; Pelletier, F. J.; Owen, W. M., Jr.; Roth, D. C.; Roundhill, I. M.; Stauch, J. R. (December 2006). "The Gravity Field of the Saturnian System from Satellite Observations and Spacecraft Tracking Data". The Astronomical Journal. 132: 2520–2526. Bibcode:2006AJ....132.2520J. doi:10.1086/508812. 

External links[edit]