(26308) 1998 SM165

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(26308) 1998 SM165
Discovery [1]
Discovered by Nichole M. Danzl
Discovery date September 16, 1998
Designations
MPC designation (26308) 1998 SM165
none
twotino[2][3]
Kozai
Orbital characteristics[6]
Epoch December 9, 2014 (JD 2457000.5)
(uncertainty=3)
Aphelion 65.165 AU (9,749 Gm)
Perihelion 30.0309 AU (4,493 Gm)
47.5980 AU (7,121 Gm)
Eccentricity 0.3690
328.39 yr (119,945 d)
4.17 km/s
44.010°
Inclination 13.5134°
183.185°
130.992°
Known satellites S/2001 (26308) 1[4]
(96±12 km in diameter)[5]
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]
Albedo 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

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

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]

Satellite

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

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External links