(612931) 2005 CA79: Difference between revisions

(612931) 2005 CA₇₉
Discovery
Discovered by	Mike Brown
Discovery site	Palomar Observatory
Discovery date	1 February 2005
Designations
Minor planet category	TNO · twotino · distant
Orbital characteristics
Aphelion	59.197 AU
Perihelion	37.126 AU
Semi-major axis	48.183 AU
Eccentricity	0.229
Orbital period (sidereal)	328.08 yr
Inclination	11.7°
Physical characteristics
Mean diameter	313 km
Mean radius	156 km
Mean density	0.192

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Revision as of 02:07, 26 December 2024

(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 in 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.

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 spectrogram 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 certainity on his 5-class taxonomic system (see here).

References

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

External links

(612931) 2005 CA79 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[MPC-object-1] "(612931) = 2005 CA79". Minor Planet Center. Retrieved 22 November 2024.

[A-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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[2]

[3]

@@ Line 11: / Line 11: @@
 | eccentricity = 0.229
 | period = 328.08 [[Julian year (astronomy)|yr]]
-| inclination = 11.7
+| inclination = 11.7°
 | mean_diameter = 313 km
 | mean_radius = 156 km
@@ Line 17: / Line 17: @@
 }}
-'''{{mp|612931|2005 CA|79}}''', 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 in February 1, 2005 by a team led by [[Michael E. Brown]]. It is classified as a [[twotino]], a [[minor planet]] in a [[resonant trans-Neptunian object#1:2|1:2]] mean-motion [[orbital resonance]] with [[Neptune]]. The [[dwarf planet candidate]] measures approximately 340 km in diameter.<ref name=A>{{cite web|language=en | url = http://www.minorplanetcenter.org/iau/lists/TNOs.html | title = List Of Transneptunian Objects | publisher = [[Minor Planet Center]] | date = November 18, 2014}}</ref><ref>{{cite web|language=en | url = http://web.gps.caltech.edu/~mbrown/dps.html | title = How many dwarf planets are there in the outer solar system? (updates daily) | date = April 15, 2015}}</ref> As of 2021, it has not been [[Astronomical naming convention#Minor planets|named]].
+'''{{mp|612931|2005 CA|79}}''', 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 in 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 [[resonant trans-Neptunian object#1:2|1:2]] mean-motion [[orbital resonance]] with [[Neptune]]. The [[dwarf planet candidate]] measures approximately 340 km in diameter.<ref name=A>{{cite web|language=en | url = http://www.minorplanetcenter.org/iau/lists/TNOs.html | title = List Of Transneptunian Objects | publisher = [[Minor Planet Center]] | date = November 18, 2014}}</ref><ref>{{cite web|language=en | url = http://web.gps.caltech.edu/~mbrown/dps.html | title = How many dwarf planets are there in the outer solar system? (updates daily) | date = April 15, 2015}}</ref> As of 2021, it has not been [[List of named minor planets (alphabetical)|named]].
+== Orbit and classification ==
-== Twotino ==
+{{mp|2005 CA|79}} 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.
-{{mp|2005 CA|79}} has a [[semi-major axis]] (average distance from the sun) [[Classical Kuiper belt object|near the edge of the classical Kuiper belt]]. Johnston's Archive lists this onject as a [[twotino]] that it stays in a 1:2 [[orbital resonance]] with the planet [[Neptune]] (for every orbit a twotino makes, Neptune orbits twice).
+{{mp|2005 CA|79}} 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 object]]s.
+== Numbering and naming ==
+{{mp|2005 CA|79}} was numbered by the [[Minor Planet Center]] in late-2021, receiving the number {{LoMP|612931|(612931)}} in the [[LOMP|minor planet catalog]]. As of 2020, it has not been [[List of named minor planets (alphabetical)|named]].<ref name=A/>
-== Discovery ==
-CA79 was discovered by a team led by Mike Brown on the [[Palomar Observatory]] on February 1, 2005. It was not announced until 2007.
 == Physical characteristics ==
 === Colour and rotation period ===
@@ Line 30: / Line 33: @@
 === Diameter and albedo ===
 According to [[Michael E. Brown]] and Johnston's Archive, {{mp|2005 CA|79}} measures approximately 449 km and 339 km in diameter with [[geometric albedo]]s of 0.030 and 0.040 respectively. On his website [[Michael E. Brown|Mike Brown]] estimates a diameter of 449 km and lists it as a [[possible dwarf planets|"probable" dwarf planet]] which is the category with the second lowest certainity on his 5-class taxonomic system (see [[List of possible dwarf planets|here]]).
-== Numbering and naming ==
-{{mp|2005 CA|79}} was numbered by the [[Minor Planet Center]] in early-2022, receiving the number {{LoMP|612931|(612931)}} in the [[LOMP|minor planet catalog]]. As of 2020, it has not been [[List of named minor planets (alphabetical)|named]].<ref name=A/>
 == See also ==