(612931) 2005 CA79

Last updated
(612931) 2005 CA79
Discovery
Discovered by Mike Brown
Discovery site Palomar Observatory [1]
Discovery date1 February 2005
Designations
TNO  · twotino  · distant  · p-DP
Orbital characteristics
Aphelion 59.197 AU
Perihelion 37.126 AU
48.183 AU
Eccentricity 0.229
328.08 yr
Inclination 11.7°
Physical characteristics
313 km
156 km
Mean density
0.192

    (612931) 2005 CA79, also written 2005 CA79 is a resonant trans-Neptunian object from the Kuiper belt in the outermost regions of the Solar System. It was discovered on February 1, 2005 by a team led by Michael E. Brown on the Palomar Observatory. It is classified as a twotino, a minor planet in a 1:2 mean-motion orbital resonance with Neptune. The dwarf planet candidate measures approximately 340 km in diameter. [2] [3] As of 2021, it has not been named.

    Contents

    Orbit and classification

    2005 CA79 orbits the sun at a distance of 37.1-59.1 AU per 326.5 Earth years. (174,276 days, semi-major axis of 48.1 AU). Its orbit has an eccentricity of 0.229 and an inclination of 11.7° respective to the elliptic. Its observation arc began with Palomar Observatories in 2005.

    2005 CA79 is a trans-Neptunian object and belongs to the twotinos a mid-sized group of objects locked in a 1:2 mean-motion orbital resonance with the planet Neptune (for every orbit a twotino makes, Neptune orbits twice). These objects are therefore protected from Neptune's scattering effect. Twotinos are located in the outer ridge of the Kuiper belt, a disc of mostly non-resonant trans-Neptunian objects.

    Numbering and naming

    2005 CA79 was numbered by the Minor Planet Center in late-2021, receiving the number (612931) in the minor planet catalog. As of 2020, it has not been named. [2]

    Physical characteristics

    Colour and rotation period

    As of 2021, no spectrum nor a rotational lightcurve has been obtained from photometry. The body's color, rotation period, axial tilt, pole, and shape remain unknown.

    Diameter and albedo

    According to Michael E. Brown and Johnston's Archive, 2005 CA79 measures approximately 449 km and 339 km in diameter with geometric albedos of 0.030 and 0.040 respectively. On his website Mike Brown estimates a diameter of 449 km and lists it as a "probable" dwarf planet which is the category with the second lowest certainty on his 5-class taxonomic system (see here).

    See also

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    References

    1. ↑ "(612931) = 2005 CA79". Minor Planet Center. Retrieved 22 November 2024.
    2. 1 2 "List Of Transneptunian Objects". Minor Planet Center. November 18, 2014.
    3. ↑ "How many dwarf planets are there in the outer solar system? (updates daily)". April 15, 2015.
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