240P/NEAT

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240P/NEAT
240P 2018-12-12 image ZTF-sso-669-zr-fov-7.0arcmin.png
Comet 240P/NEAT photographed from the Zwicky Transient Facility on 12 December 2018.
Discovery [1]
Discovered by K. J. Lawrence
Discovery site NEAT–Palomar
Discovery date7 December 2002
Designations
P/2002 X2, P/2010 P1
Orbital characteristics [2]
Epoch 21 November 2025 (JD 2461000.5)
Observation arc 22.99 years
Earliest precovery date5 October 2002
Number of
observations		3,401
Aphelion 5.602 AU
Perihelion 2.12162 AU (A) [3]
2.12174 AU (B) [4]
Semi-major axis 3.861 AU
Eccentricity 0.4506
Orbital period 7.59 years
Inclination 23.54°
74.91°
Argument of
periapsis 		352.08°
Last perihelion15 May 2018
Next perihelion19 December 2025 (B+A) [4] [3]
TJupiter 2.758 (A+B)
Earth MOID 1.145 AU (A)
1.137 AU (B)
Jupiter MOID 0.242 AU (A)
0.235 AU (B)
Physical characteristics [5]
Mean radius
2.665 km (1.656 mi) [6]
(original nucleus)
Comet total
magnitude (M1)		10.3
12.0 [7]
(2025-11-20)

240P/NEAT is a Jupiter-family comet with an orbital period of 7.61 years. It was discovered by Near Earth Asteroid Tracking (NEAT) on 7 December 2002. [1]

Contents

The comet came opposition on 22 November 2025, and will come to perihelion on 19 December 2025 when it should be around magnitude 12-13. [8]

Observational history

The comet at discovery had an apparent magnitude of 18.4, and further observations revealed it had a coma about 8 arcseconds across and a tail 14 arcseconds long. [1] The comet was spotted in prediscovery images dating from 5 October and 6 December by LONEOS and from 5 November by NEAT. Based on these observations it was recognised it is a periodic comet with an orbital period of 8.1 years. [1] The comet was recovered independently by H. Taylor, H. Sato, Leonid Elenin, and T. Yusa on 9, 10, 11, and 11 August 2010 respectively, at an estimated magnitude of around 17. [9] [10]

The comet had a close approach to Jupiter on 10 July 2007 at a distance of 0.252 AU (37.7 million km) [5] which reduced the orbital period to 7.6 years and the perihelion distance from 2.5 to 2.1 AU. [11] The comet experienced three events of significant brightening which last for three to six months during its next two perihelia, on March-April 2011, July-August 2018, [12] and on November-December 2018. The events more likely are the result of the warming of previously insulated material due to the reduction of the perihelion distance. The new activity takes place in one or two locations of the nucleus. [13]

240P-B

On 3 October 2025 fragment 240P-B was imaged by Kitt Peak and reported by V. Carvajal. [14] 240P-B should also come to perihelion on 19 December 2025, [4] about 14 minutes before the main body and about 0.00007 AU (10,000 km; 6,500 mi) farther from the Sun.

2025 perihelion passage
FragmentPerihelion timePerihelion distance
240P-B [4] 2025-Dec-19 23:002.12169 AU (317,400,000 km; 197,223,000 mi)
240P-A [3] 2025-Dec-19 23:142.12162 AU (317,390,000 km; 197,217,000 mi)

References

  1. 1 2 3 4 K. J. Lawrence; R. Bambery; E. Helin; S. Pravdo; M. Hicks; et al. (9 December 2002). D. W. Green (ed.). "Comet P/2002 X2 (NEAT)". IAU Circular. 8029 (1). Bibcode:2002IAUC.8029....1L. ISSN   0081-0304.
  2. ↑ "240P/NEAT Orbit". Minor Planet Center . Retrieved 29 September 2025.
  3. 1 2 3 "Horizons Batch for 240P/NEAT (90001202) on 2025-Dec-19" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 3 October 2025. Retrieved 22 November 2025. (Soln.date: 2025-Nov-21)
  4. 1 2 3 4 "Horizons Batch for 240P-B (90001203) on 2025-Dec-19" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons . Retrieved 22 November 2025. (Soln.date: 2025-Nov-21)
  5. 1 2 "240P/NEAT – Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved 22 August 2025.
  6. ↑ J. M. Bauer; T. Grav; Y. R. Fernández; et al. (2017). "Debiasing the NEOWISE Cryogenic Mission Comet Populations". The Astronomical Journal. 154 (2): 53–62. Bibcode:2017AJ....154...53B. doi: 10.3847/1538-3881/aa72df .
  7. ↑ "COBS Observation list: 240P". COBS – Comet OBServation database. Crni Vrh Observatory. Retrieved 21 November 2025.
  8. ↑ S. Yoshida. "240P/NEAT". www.aerith.net. Retrieved 22 August 2025.
  9. ↑ H. Taylor; H. Sato; L. Elenin; T. Yusa; et al. (August 2010). D. W. Green (ed.). "Comet P/2010 P1 (NEAT)" . IAU Circular. 9159 (2). Bibcode:2010IAUC.9159....2T. ISSN   0081-0304.
  10. ↑ K. Kadota; R. Bambery; E. Helin; et al. (12 August 2010). "P/2002 X2 (NEAT) = P/2010 P1". Minor Planet Electronic Circulars. 2010-P51. Bibcode:2010MPEC....P...51K. ISSN   1523-6714.
  11. ↑ K. Kinoshita. "240P/NEAT". jcometobs.web.fc2.com. Retrieved 22 August 2025.
  12. ↑ H. Sato (August 2017). D. W. Green (ed.). "Comet 240P/NEAT" . Central Bureau Electronic Telegrams. 4427 (1). Bibcode:2017CBET.4427....1S.
  13. ↑ M. S. P. Kelley; D. Bodewits; Q. Ye; T. L. Farnham; E. C. Bellm; et al. (2019). "Comet 240P/NEAT Is Stirring". The Astrophysical Journal Letters. 886 (1): L16. arXiv: 1911.02383 . Bibcode:2019ApJ...886L..16K. doi: 10.3847/2041-8213/ab53e0 .
  14. ↑ V. Carvajal; et al. (6 October 2025). "Comet 240P-B/NEAT". Minor Planet Electronic Circulars. 2025-T124. ISSN   1523-6714.
Numbered comets
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