(26308) 1998 SM165
| Discovery | |
|---|---|
| Discovered by | Nichole M. Danzl[1] |
| Discovery date | September 16, 1998 |
| Designations | |
| MPC designation | (26308) 1998 SM165 |
| Alternative names | none |
| Minor planet category |
twotino[2][3] Kozai |
| Orbital characteristics[4] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 65.154 AU (9746.966 Gm) |
| Perihelion | 29.902 AU (4473.234 Gm) |
| Semi-major axis | 47.528 AU (7110.100 Gm) |
| Eccentricity | 0.371 |
| Orbital period | 327.67 a (119,680.629 d) |
| Average orbital speed | 4.17 km/s |
| Mean anomaly | 35.495° |
| Inclination | 13.515° |
| Longitude of ascending node | 183.158° |
| Argument of perihelion | 130.468° |
| Known satellites |
S/2001 (26308) 1[5] (96 ± 12 km in diameter)[6] |
| Physical characteristics | |
| Dimensions | 287 ± 36 km (primary)[6] |
| Mean density |
0.51+0.29 −0.14 g/cm3[6] |
| Sidereal rotation period | 8.40 ± 0.05 h[6] |
| Albedo | 0.07 ± 0.02[6] |
| Temperature | ~40 K |
| Absolute magnitude (H) | 5.8 |
|
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(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 M. Danzl. It is in a 1:2 orbital resonance with the planet Neptune.
Twotino
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[6]
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.[6]
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.[5]
References
- ↑ "List Of Transneptunian Objects".
- ↑ 2.0 2.1 "MPEC 2009-J35 :Distant Minor Planets (2009 MAY 29.0 TT)". Minor Planet Center. 2009-05-08. Retrieved 2009-05-12.
- ↑ 3.0 3.1 Marc W. Buie (2007/09/11 using 73 observations). "Orbit Fit and Astrometric record for 26308". SwRI (Space Science Department). Retrieved 2009-05-12.
- ↑ "26308 (1998 SM165)". JPL Small-Body Database Browser. 2007-09-11 last obs. Retrieved 2009-05-12.
- ↑ 5.0 5.1 "(26308) 1998 SM165 and S/2001 (26308) 1". johnstonsarchive.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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.
- ↑ 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/0602316. Bibcode:2006ApJ...643..556S. doi:10.1086/502674.
- ↑ 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
- Orbital simulation from JPL (Java) / Ephemeris
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