152P/Helin–Lawrence

For other comets of the same name, see Comet Helin.

152P/Helin–Lawrence
Discovery[1]
Discovered byEleanor F. Helin
Kenneth J. Lawrence
Discovery sitePalomar Observatory
Discovery date17 May 1993
Designations
P/1993 K2
P/2001 Y1
1993 XI, 1993l[2]
Orbital characteristics[5][6]
Epoch9 February 2015 (JD 2457062.5)
Observation arc31.71 years
Earliest precovery date21 April 1993
Number of
observations		1,298
Aphelion5.874 AU
Perihelion3.113 AU
Semi-major axis4.493 AU
Eccentricity0.30722
Orbital period9.52 years
Inclination9.868°
91.899°
Argument of
periapsis		163.59°
Mean anomaly97.858°
Last perihelion13 January 2022[3]
Next perihelion9 July 2031[4]
TJupiter2.901
Earth MOID2.099 AU
Jupiter MOID0.338 AU
Physical characteristics[5]
Mean diameter
4.6 km (2.9 mi)[7]
Comet total
magnitude (M1)		12.7

152P/Helin–Lawrence is a Jupiter-family comet with a 9.52-year orbit around the Sun. It is the third comet co-discovered by Eleanor F. Helin and Kenneth J. Lawrence.[a][b]

Observational history

Both Helin and Lawrence discovered the diffuse trails of the comet from the photographic plates exposed from the Palomar Observatory on the night of 17 May 1993.[1] At the time, it was a 17th-magnitude object within the constellation Scorpio.[c] Shortly after the announcement of its discovery, Robert H. McNaught was able to observe it during the total lunar eclipse of 4 June 1995.[9]

It was recovered from the Saji Observatory by T. Oribe and Shuichi Nakano on 24 December 2001.[10]

Physical characteristics

Polarimetric observations from the European Southern Observatory in 2012 revealed that both 74P/Smirnova–Chernykh and 152P/Helin–Lawrence still produce cometary activity even at large heliocentric distances, suggesting that both comets were relative newcomers to the inner Solar System and thus contain large reservoirs of volatile material in their respective interiors.[11]

The nucleus of 152P/Helin–Lawrence is estimated to be around 4.6 km (2.9 mi) in diameter,[7] based on observations conducted using the Hubble and Keck telescopes in 1998.[12]

Notes

  1. ^ Eleanor Helin and Kenneth Lawrence co-discovered C/1991 F2 and C/1992 Q2 prior to 152P.
  2. ^ 152P is also the 12th and final comet discovered by Eleanor Helin, excluding her rediscovery of 107P/Wilson–Harrington
  3. ^ Reported initial position upon discovery was: α = 16h 45.3m , δ = –16° 06′[8]

References

  1. ^ a b E. F. Helin; K. J. Lawrence; M. Nassir; et al. (2 June 1993). D. W. Green (ed.). "Comet Helin–Lawrence (1993l)". IAU Circular. 5810 (1). Bibcode:1993IAUC.5810....1H.
  2. ^ "Comet Names and Designations". International Comet Quarterly. Retrieved 26 November 2025.
  3. ^ S. Nakano (6 February 2011). "152P/Helin–Lawrence (NK 2031)". OAA Computing and Minor Planet Sections. Retrieved 25 February 2012.
  4. ^ "Horizons Batch for 152P/Helin–Lawrence on 2031-Jul-09" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 22 June 2022. (JPL#72 Soln.date: 2022-Jun-20)
  5. ^ a b "152P/Helin–Lawrence – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 26 November 2025.
  6. ^ "152P/Helin–Lawrence Orbit". Minor Planet Center. Retrieved 18 June 2014.
  7. ^ a b P. L. Lamy; I. Toth; Y. R. Fernández; H. A. Weaver (2004). "The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei" (PDF). Comets II. University of Arizona Press. pp. 223–264. Bibcode:2004come.book..223L. doi:10.2307/j.ctv1v7zdq5.22. ISBN 978-0-8165-2450-1. JSTOR j.ctv1v7zdq5.22.
  8. ^ G. W. Kronk; M. Meyer; D. A. J. Seargent (2017). Cometography: A Catalog of Comets. Vol. 6: 1983–1993. Cambridge University Press. pp. 783–787. ISBN 978-0-521-87216-4.
  9. ^ E. F. Helin; K. J. Lawrence; M. Nassir; et al. (4 June 1993). D. W. Green (ed.). "Periodic Comet Helin–Lawrence (1993l)". IAU Circular. 5811 (1). Bibcode:1993IAUC.5811....1H.
  10. ^ S. Nakano; T. Oribe; B. G. Marsden; et al. (14 January 2002). D. W. Green (ed.). "Comet P/2001 Y1 (Helin–Lawrence)". IAU Circular. 7790 (1). Bibcode:2002IAUC.7790....1N.
  11. ^ A. Stinson; S. Bagnulo; G. P. Tozzi; et al. (2016). "Polarimetry of comets 67P/Churyumov–Gerasimenko, 74P/Smirnova–Chernykh, and 152P/Helin–Lawrence" (PDF). Astronomy & Astrophysics. 594 (A110): 1–16. arXiv:1606.05192. Bibcode:2016A&A...594A.110S. doi:10.1051/0004-6361/201527696.
  12. ^ K. J. Meech; O. R. Hainaut; B. G. Marsden (2004). "Comet nucleus size distributions from HST and Keck telescopes". Icarus. 170 (2): 463–491. Bibcode:2004Icar..170..463M. doi:10.1016/j.icarus.2004.03.014.


allikas: https://en.wikipedia.org/wiki/152P/Helin%E2%80%93Lawrence