118401 LINEAR

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118401 LINEAR
176P/LINEAR
Discovery
Synodic rotation period
? d
0.06±0.02R[4]
Temperature~156 K
?
18.19 to 21.91
15.1[1]
176P/LINEAR
Discovery
AU
Eccentricity0.1924908
Orbital period5.714 a
Inclination0.23795°
Last perihelionNovember 21, 2022[6]
2017 March 12[6]
June 30, 2011[7]
October 18, 2005
Next perihelion2028-Aug-05[8]

118401 LINEAR (

University of Hawaii's 2.2-m (88-in) telescope on December 24–27, 2005, and Gemini on December 29, 2005. Observations using the Spitzer Space Telescope have resulted in an estimate of 4.0±0.4 km for the diameter of (118401) LINEAR.[4]

The main-belt comets are unique in that they have flat (within the plane of the planets' orbits), approximately circular (small

sublimates (changes directly from ice to gas), venting gas and dust into space, creating a tail and giving the object a fuzzy appearance. Far from the Sun, sublimation stops, and the remaining ice stays frozen until the comet's next pass close to the Sun. In contrast, objects in the asteroid belt have essentially circular orbits and are expected to be mostly baked dry of ice by their confinement to the inner Solar System (see extinct comet
).

It is suggested that these main-belt asteroid-comets are evidence of a recent impact exposing an icy interior to solar radiation.[2] It is estimated short-period comets remain active for about 10,000 years before having most of their ice sublimated away and going dormant.

Eight other objects are classified as both periodic comets and numbered asteroids:

minor planet designation.[9]

118401 LINEAR last came to perihelion on 2017 March 12.[6]

References

  1. ^ a b c "JPL Small-Body Database Browser: 118401 LINEAR (1999 RE70)" (2010-11-02 last obs). Retrieved 26 March 2016.
  2. ^ a b c Henry H. Hsieh (May 2010). "Main Belt Comets". Hawaii. Archived from the original on 2011-08-06. Retrieved 2010-12-15. (older 2010 site) Archived 2009-08-10 at the Wayback Machine
  3. ^ a b David Jewitt. "Main Belt Comets". UCLA, Department of Earth and Space Sciences. Retrieved 2010-12-15.
  4. ^
    S2CID 17438376
    .
  5. ^ Using a spherical radius of 2 km; volume of a sphere * an assumed density of 1.3 g/cm3 yields a mass (m=d*v) of 4.3E+13 kg
  6. ^ a b c "176P/LINEAR Orbit". Minor Planet Center. Retrieved 2017-04-09.
  7. Syuichi Nakano (2006-10-29). "176P/LINEAR = (118401) 1999 RE70 (NK 1373)"
    . OAA Computing and Minor Planet Sections. Retrieved 2012-02-25.
  8. ^ "Horizons Batch for 118401 LINEAR (1999 RE70 on 2028-Aug-05" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-05-01. (JPL#73/Soln.date: 2023-Apr-27)
  9. ^ a b "Dual-Status Objects". Minor Planet Center. 2008-03-06. Retrieved 2018-02-13.
  10. ^ M.P.C. 133823

External links

Numbered comets
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175P/Hergenrother
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177P/Barnard
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