C/2015 V2 (Johnson)

C/2015 V2 (Johnson)
	Comet Johnson photographed by Kees Scherer on 3 April 2017
Discovery
Discovered by	Jess A. Johnson
Discovery site	Catalina Sky Survey (703)
Discovery date	3 November 2015
Orbital characteristics
Epoch	18 January 2017 (JD 2457771.5)
Observation arc	1,750 days (4.79 years)
Number of; observations	5,886
Perihelion	1.637 AU
Semi-major axis	59,200 AU (inbound)
Eccentricity	1.00170
Inclination	49.875°
Longitude of; ascending node	69.852°
Argument of; periapsis	164.90°
Mean anomaly	–0.005°
Last perihelion	12 June 2017
Earth MOID	0.642 AU
Jupiter MOID	3.349 AU
Physical characteristics
Dimensions	2.2–4.0 km (1.4–2.5 mi); 1.7 ± 0.14 km (1.056 ± 0.087 mi)
Mean diameter	3.0 km (1.9 mi)
Comet total; magnitude (M1)	10.0
Comet nuclear; magnitude (M2)	16.127±0.176
Apparent magnitude	7.1; (2017 apparition)

C/2015 V2 (Johnson) is a hyperbolic comet discovered on 3 November 2015 by Jess Johnson (Catalina Sky Survey) at an apparent magnitude of 17.1 using a 0.68-meter (27 in) Schmidt–Cassegrain telescope.^[1]^[6]^[7]^[8] Its incoming orbit had a semimajor Axis of 59,200 AU (0.936 ly), but will have a hyperbolic trajectory after leaving the solar system, with an eccentricity of 1.0009. The comet was expected to be able to be seen with binoculars in late May 2017 in the Northern Hemisphere,^[9] with a magnitude of 6 to 7, but the comet was fainter than predicted,^[10] reaching a magnitude of 7.1 on June 21.^[11]

Characteristics

The comet was characterised by its very low activity, resembling a manx comet. The comet showed no emission from C2, C3 and CN, which are part of the typical spectrum of comet, when it was 2,83 AU from the Sun, but they were detected when the comet reached 2,3 AU from the Sun.^[12] The comet was observed by the SWAN instrument onboard SOHO and determined its water production near perihelion was 10²⁹/s. Infrared spectroscopic observations indicated that the rotational temperature of the comet was warmer than predicted, indicating the presence of an icy grainy halo.^[13] The absolute nuclear magnitude was estimated to be 16.127±0.176, indicating that the effective radius of the comet was 1.7±0.138 km.^[5] The comet exhibited fan-shaped fine jets in the direction opposite of the Sun when imaged using polarimetry.^[14]

References

^ ^a ^b "MPEC 2015-V44 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-05. Retrieved 2015-11-05. (CK15V020)
^ ^a ^b "C/2015 V2 (Johnson) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 25 October 2015.
^ "MPC: Orbits/Observations Database: C/2015 V2 (Johnson)" (last observation: 2015-11-22; arc: 19 days). The Minor Planet Center. Retrieved 2015-10-25.
^ ^a ^b D. C. Jewitt (2022). "Destruction of Long-period Comets". Astronomical Journal. 164 (4): 158–166. arXiv:2208.04469. Bibcode:2022AJ....164..158J. doi:10.3847/1538-3881/ac886d.
^ ^a ^b M. L. Paradowski (2020). "A new method of determining brightness and size of cometary nuclei" (PDF). Monthly Notices of the Royal Astronomical Society. 492 (3): 4175–4188. Bibcode:2020MNRAS.492.4175P. doi:10.1093/mnras/stz3597.
^ "MPEC 2015-V62 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-06. Retrieved 2015-11-25. (CK15V020)
^ "MPEC 2015-W09 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-17. Retrieved 2015-11-25. (CK15V020)
^ "MPEC 2015-W63 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. 2015-11-23. Retrieved 2015-11-25. (CK15V020)
^ "Komet Johnson zieht über den Mai-Himmel" [Comet Johnson moves across the May sky]. Märkische Allgemeine (in German). Archived from the original on 21 August 2017. Retrieved 13 May 2017.
^ "Weekly Information about Bright Comets (2017 July 1: North)". www.aerith.net. Retrieved 16 October 2022.
^ "Weekly Information about Bright Comets (2017 Aug. 12: North)". www.aerith.net. Retrieved 16 October 2022.
^ V. Kumar; S. Ganesh (2018). "Results from two unusual comets C/2016 R2 (Pan-STARRS) and C/2015 V2 (Johnson)" (PDF). European Planetary Science Congress. 12: 1220. Bibcode:2018EPSC...12.1220V.
^ M. R. Combi; Y. Shou; T. Mäkinen; J. L. Bertaux; et al. (2021). "Water production rates from SOHO/SWAN observations of six comets: 2017–2020". Icarus. 365: 114509. arXiv:2105.06565. Bibcode:2021Icar..36514509C. doi:10.1016/j.icarus.2021.114509. S2CID 234679279.
^ A. M. Mazarbhuiya; H. S. Das; B. J. Medhi; P. Halder; P. Deb Roy (2022). "Study of dust coma of comets 32P/Comas Sola and C/2015 V2 (Johnson) by imaging polarimetry". Astrophysics and Space Science. 367 (9): 98. Bibcode:2022Ap&SS.367...98M. doi:10.1007/s10509-022-04133-7. S2CID 252600934.

External links

C/2015 V2 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[MPEC_2015-V44-1] "MPEC 2015-V44 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-05. Retrieved 2015-11-05. (CK15V020)

[jpl-2] "C/2015 V2 (Johnson) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 25 October 2015.

[MPCOODB-3] "MPC: Orbits/Observations Database: C/2015 V2 (Johnson)" (last observation: 2015-11-22; arc: 19 days). The Minor Planet Center. Retrieved 2015-10-25.

[Jewitt_2022-4] D. C. Jewitt (2022). "Destruction of Long-period Comets". Astronomical Journal. 164 (4): 158–166. arXiv:2208.04469. Bibcode:2022AJ....164..158J. doi:10.3847/1538-3881/ac886d.

[Paradowski_2020-5] M. L. Paradowski (2020). "A new method of determining brightness and size of cometary nuclei" (PDF). Monthly Notices of the Royal Astronomical Society. 492 (3): 4175–4188. Bibcode:2020MNRAS.492.4175P. doi:10.1093/mnras/stz3597.

[MPEC_2015-V62-6] "MPEC 2015-V62 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-06. Retrieved 2015-11-25. (CK15V020)

[MPEC_2015-W09-7] "MPEC 2015-W09 : COMET C/2015 V2 (JOHNSON)". IAU Minor Planet Center. 2015-11-17. Retrieved 2015-11-25. (CK15V020)

[MPEC_2015-W63-8] "MPEC 2015-W63 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. 2015-11-23. Retrieved 2015-11-25. (CK15V020)

[maz-online1-9] "Komet Johnson zieht über den Mai-Himmel" [Comet Johnson moves across the May sky]. Märkische Allgemeine (in German). Archived from the original on 21 August 2017. Retrieved 13 May 2017.

[10] "Weekly Information about Bright Comets (2017 July 1: North)". www.aerith.net. Retrieved 16 October 2022.

[11] "Weekly Information about Bright Comets (2017 Aug. 12: North)". www.aerith.net. Retrieved 16 October 2022.

[Kumar_2018-12] V. Kumar; S. Ganesh (2018). "Results from two unusual comets C/2016 R2 (Pan-STARRS) and C/2015 V2 (Johnson)" (PDF). European Planetary Science Congress. 12: 1220. Bibcode:2018EPSC...12.1220V.

[Combi_2021-13] M. R. Combi; Y. Shou; T. Mäkinen; J. L. Bertaux; et al. (2021). "Water production rates from SOHO/SWAN observations of six comets: 2017–2020". Icarus. 365: 114509. arXiv:2105.06565. Bibcode:2021Icar..36514509C. doi:10.1016/j.icarus.2021.114509. S2CID 234679279.

[Mazarbhuiya_2022-14] A. M. Mazarbhuiya; H. S. Das; B. J. Medhi; P. Halder; P. Deb Roy (2022). "Study of dust coma of comets 32P/Comas Sola and C/2015 V2 (Johnson) by imaging polarimetry". Astrophysics and Space Science. 367 (9): 98. Bibcode:2022Ap&SS.367...98M. doi:10.1007/s10509-022-04133-7. S2CID 252600934.

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C/2015 V2 (Johnson)

Characteristics

References

External links

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