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(26308) 1998 SM165

Trans-Neptunian binary

Field	Value
minorplanet	yes
background	#C2E0FF
image	1998SM165-Trujillo-HST.jpg
caption	Hubble Space Telescope image of and its companion, taken in December 2001
name
discovery_ref
discoverer	N. Danzl
discovery_site	Kitt Peak Obs.
discovered	16 September 1998
mpc_name
alt_names
named_after
mp_category	TNOtwotino
Kozaidistant
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	2
observation_arc	32.26 yr (11,784 days)
earliest_precovery_date	12 October 1982
aphelion	64.968 AU
perihelion	29.866 AU
semimajor	47.417 AU
eccentricity	0.3701
period	326.52 yr (119,261 days)
mean_anomaly	47.484°
mean_motion	/ day
inclination	13.521°
asc_node	183.21°
arg_peri	130.22°
satellites	1

dimensions	km (derived)
km
mass
density
rotation
albedo
abs_magnitude	5.7

Kozaidistant

**** is a resonant trans-Neptunian object and binary system from the Kuiper belt in the outermost regions of the Solar System. It was discovered on 16 September 1998, by American astronomer Nichole Danzl at the Kitt Peak National Observatory in Arizona. It is classified as a twotino and measures approximately 280 kilometers in diameter. Its minor-planet moon was discovered in 2001.

Twotino

has a semi-major axis (average distance from the Sun) near the edge of the classical belt. The Deep Ecliptic Survey (DES) list this trans-Neptunian object as 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).

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 is similar to the density of the binary plutino 47171 Lempo (0.3–0.8 g/cm3) and Saturn's moon Hyperion () Such a low density is indicative of a highly porous composition dominated by ice.

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

Satellite

On 22 December 2001, a minor-planet moon was discovered by American astronomers Michael Brown and Chad Trujillo using the Hubble Space Telescope. The discovery was announced in January 2002. The satellite measures approximately 96 +/- in diameter and orbits its primary at a distance of 11,310 +/-. Assuming a circular orbit, this takes days to complete one orbit.

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 5 July 2001. As of 2025, it has not been named.

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

twotinos discoveries-by-nichole-m.-danzl binary-trans-neptunian-objects astronomical-objects-discovered-in-1998

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