169P/NEAT

Last updated
169P/NEAT
Discovery
Discovered by NEAT
Discovery dateMarch 15, 2002
Designations
P/2002 EX12
Orbital characteristics [1] [2]
Epoch 2022-08-09 (2459800.5)
Aphelion 4.6014 AU
Perihelion 0.60282 AU
Semi-major axis 2.6021 AU
Eccentricity 0.76833
Orbital period 4.1975 yr
Inclination 11.2985°
Last perihelion9 July 2022
Physical characteristics [3]
Mean radius
2.5 km (1.6 mi)
8.4 hours

169/NEAT is a periodic comet in the Solar System. It is the parent body of the alpha Capricornids meteor shower in late July. 169/NEAT may be related to comet P/2003 T12 (SOHO). [4] [5]

Contents

Physical characteristics

169P is a low activity comet roughly about 5.0 km (3.1 mi) in diameter, [3] [6] with a rotation period lasting about 8.4 hours. [3] It could have originated from the main asteroid belt. [5]

Orbit

It last came to perihelion (closest approach to the Sun) on 9 July 2022. [2] On 13 July 2022 passed 0.1395 AU (20.87 million km) from Venus. [1] On 11 August 2026, it will pass 0.1672 AU (25.01 million km) from Earth and then come to perihelion on 21 September 2026.

169P has a similar stable orbit with the smaller body P/2003 T12 (SOHO), both avoiding close encounters with Jupiter. It is possible that both comets likely fragmented from a parent body a bit over 2,000 years ago. [5] [6] A further fragmentation even about 4,500 to 5,000 years ago could have produced the meteors of the alpha Capricornids meteor shower. The total estimated mass of the meteors is similar to that of the surviving comet. [7]

References

  1. 1 2 "169P/NEAT – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved 22 June 2022.
  2. 1 2 "169P/NEAT Orbit". Minor Planet Center . Retrieved 2 June 2014.
  3. 1 2 3 B. E. A. Mueller; N. H. Samarasinha (2018). "Further Investigation of Changes in Cometary Rotation". The Astronomical Journal. 156 (3): 107–114. arXiv: 1806.11158 . Bibcode:2018AJ....156..107M. doi: 10.3847/1538-3881/aad0a1 .
  4. 169P NEAT and P/2003 T12 - 300 years ago
  5. 1 2 3 S. R. Alvarez; A. S. Oyarzabal (2024). "Comet P/2003 T12 (SOHO): A possible fragment of comet 169P/NEAT?". Planetary and Space Science. 246: 105902. doi:10.1016/j.pss.2024.105902.
  6. 1 2 A. Sosa; J. A. Fernández; A. Fitzsimmons (2015). "Comets 169P/NEAT and P/2003 T12 (SOHO): Two possible fragments of a common ancestor?". American Astronomical Society . 29. Bibcode:2015IAUGA..2255583S.
  7. P. Jenniskens; J. Vaubaillon (2010). "Minor Planet 2002 EX12(169P/NEAT) and the Alpha Capricornid Shower". The Astronomical Journal. 139 (5): 1822–1830. doi:10.1088/0004-6256/139/5/1822.
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