(26308) 1998 SM165

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(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
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion	9746.966 Gm (65.154 AU)
Perihelion	4473.234 Gm (29.902 AU)
Semi-major axis	7110.100 Gm (47.528 AU)
Eccentricity	0.371
Orbital period	119680.629 d (327.67 a)
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°
Physical characteristics
Dimensions	238 km (96±12 km satellite)[2]
Mass	1.4×1019? kg
Mean density	2.0? g/cm³
Equatorial surface gravity	0.0665? m/s²
Escape velocity	0.1258? km/s
Sidereal rotation period	? d
Albedo	0.10?
Temperature	~40 K
Spectral type	?
Absolute magnitude	5.8

(26308) 1998 SM₁₆₅, also written as (26308) 1998 SM165, is a 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.

[edit] Satellite

Along with 10% of all trans-Neptunian objects, (26308) 1998 SM₁₆₅ has a natural satellite. Designated S/2005 (26308) 1, it is about 96±12 km in diameter and it orbits its primary at a distance of 11,310±110 km, assuming a circular orbit, this takes 130.1±1 days to complete one orbit.^[3]

[edit] References

1. ^ List Of Transneptunian Objects
2. ^ List of known trans-Neptunian objects
3. ^ (26308) 1998 SM165 and S/2001 (26308) 1

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v • d • e Trans-Neptunian objects Pronunciation guide Objects in italics are unnnumbered. Plutinos Pluto1 · 1993 SB · 1993 SC · 1994 JR1 · 1994 TB · 1995 QZ9 · 1996 SZ4 · 1996 TP66 · 1996 TQ66 · 1997 QJ4 · 1998 HK151 · 1998 US43 · 1998 VG44 · 1998 WW24 · 1998 WU31 · 38083 Rhadamanthus · 1999 TC36 · 38628 Huya · 28978 Ixion · 2002 KX14 · 2002 VR128 · 2003 VS2 · 90482 Orcus · 1993 RO · 1993 RP · 2003 AZ84 · 2001 QF298 Cubewanos 1992 QB1 · 1994 GV9 · 1994 JQ1 · 1994 VK8 · 1995 GJ · 1995 SM55 · 1996 TO66 · 58534 Logos · 1997 CS29 · 1997 CU29 · 1998 HJ151 · 1998 HP151 · 1998 HM151 · 1998 KR65 · 19521 Chaos · 1998 WA25 · 1999 DF9 · 1999 HT11 · 53311 Deucalion · 20000 Varuna · 2002 AW197 · 50000 Quaoar · 2002 TX300 · 2002 UX25 · 2003 EL61 · 2003 OP32 · 2004 GV9 · 2005 FY9 · 2005 RN43 · 88611 Teharonhiawako · 1998 WW31 · 2002 MS4 · 2003 MW12 · 2003 QW90 Twotinos 1996 TR66 · 1998 SM165 · 1999 RB216 · 2000 JG81 · 2002 WC19 · 1997 SZ10 Other resonant objects 1994 JS · 1995 DA2 · 1998 WA31 · 1999 CP133 · 1999 DE9 · 1999 HB12 · 2001 KC77 · 2001 KP77 · 2002 TC302 · 2003 LG7 Scattered disc objects Eris1, 2 · 1995 TL8 · 1996 GQ21 · 1996 TL66 · 1999 CC158 · 2000 EE173 · 2000 OO67 · 2000 OM67 · 2001 UR163 · 2002 CY224 · 2002 GX32 · 2002 RP120 · 90377 Sedna2 · 2005 RM43 · 2000 CR105 2004 XR190 · 2005 TN74 · 2006 QH181 Unclassified 1997 CR29 · 1998 SN165 · 1999 CL158 · 1999 HC12 · 1999 KR16 · 1999 OY3 · 2003 FY128 · 2004 SB60 · 2004 TY364 · 2005 RR43 Natural satellites Charon (Pluto) · Hydra (Pluto) · Nix (Pluto) · Dysnomia (Eris) · S/2000 (1998 WW31) 1 · S/2005 (2003 EL61) 1 · S/2005 (2003 EL61) 2 · Zoe (Logos) · S/2005 (79360) 1 · Sawiskera (Teharonhiawako) 1 Also classified as a dwarf planet. 2 Although currently classified as an SDO, Eris and Sedna may be part of the inner Oort Cloud.