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475P/Spacewatch–LINEAR

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475P/Spacewatch–LINEAR
Discovery[1]
Discovered bySpacewatch
LINEAR
Discovery date17 February 2004
Designations
P/2004 DO29
P/2023 V7
Orbital characteristics[2][3]
Epoch21 November 2025 (JD 2461000.5)
Observation arc21.35 years[a]
Earliest precovery date11 February 2004[4]
Number of
observations		164
Aphelion10.563 AU
Perihelion4.077 AU
Semi-major axis7.320 AU
Eccentricity0.44302
Orbital period19.806 years
Inclination14.524°
147.35°
Argument of
periapsis		40.424°
Mean anomaly26.734°
Last perihelion1 June 2024
Next perihelion~2043
TJupiter2.772
Earth MOID3.107 AU
Jupiter MOID0.657 AU
Physical characteristics[2]
Mean radius
1.07 ± 0.09 km (0.665 ± 0.056 mi)[5]
Mean density
640±100 kg/m3[5]
Comet total
magnitude (M1)		7.0
Comet nuclear
magnitude (M2)		13.7

Comet Spacewatch–LINEAR, also known as 475P/Spacewatch–LINEAR, is a distant Jupiter-family comet with a roughly 20-year orbit around the Sun. It is one of several comets discovered by the Spacewatch and Lincoln Near-Earth Asteroid Research (LINEAR) surveys.

Observational history

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An apparently asteroid-like object both discovered by Spacewatch and LINEAR in 17 February 2004 was later found to have cometary activity after a 5 arcsecond-wide coma was detected upon review of photographic plates on 16 March 2004.[1] Precovery images as early as 11 February 2004 were known.[4] Observations conducted at the Galileo National Telescope in spring 2005 showed a well-developed coma and long tail even as the comet is well on its outbound trajectory at a distance of 4.22 AU (631 million km) from the Sun.[6]

The comet was accidentally recovered from images taken by Pan-STARRS on 25 November 2023,[7] with additional independent observations from the Calar Alto Observatory and Tenerife Observatory were also reported.[8] It later received its official numerical designation (475P) alongside ten other periodic comets on April 2024.[9]

Notes

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  1. ↑ Observation arc from the Minor Planet Center database covering dates from 11 February 2004 until 19 June 2025.

References

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  1. 1 2 S. S. Sheppard; Y. R. Fernandez; D. C. Jewitt (16 March 2004). D. W. Green (ed.). "Comet P/2004 DO29 (Spacewatch–LINEAR)". IAU Circular. 8305 (1). Bibcode:2004IAUC.8305....1S.
  2. 1 2 "475P/Spacewatch–LINEAR – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 14 September 2026.
  3. ↑ "475P/Spacewatch–LINEAR Orbit". Minor Planet Center. Retrieved 14 September 2026.
  4. 1 2 S. S. Sheppard; Y. R. Fernandez; D. C. Jewitt; et al. (16 March 2004). B. G. Marsden (ed.). "Comet P/2004 DO29 (Spacewatch–LINEAR)". Minor Planet Electronic Circular. 2004-F09. Bibcode:2004MPEC....F...09S. ISSN 1523-6714.
  5. 1 2 M. L. Paradowski (2022). "A New Indirect Method of Determining Density of Cometary Nuclei" (PDF). Acta Astronomica. 72 (2): 141–159. Bibcode:2022AcA....72..141P. doi:10.32023/0001-5237/72.2.4. ISSN 0001-5237.
  6. ↑ E. M. Epifani; P. Palumbo; M. T. Capria; et al. (2008). "The distant activity of Short Period Comets*– II". Monthly Notices of the Royal Astronomical Society. 390 (1): 265–280. Bibcode:2008MNRAS.390..265M. doi:10.1111/j.1365-2966.2008.13718.x.
  7. ↑ M. Micheli; F. Ocaña; R. Kresken; et al. (22 January 2024). "Comet P/2004 DO29 = P/2023 V7 (Spacewatch–LINEAR)". Minor Planet Electronic Circular. 2024-B93. Bibcode:2004MPEC....F...09S. doi:10.48377/MPEC/2024-B93. ISSN 1523-6714.
  8. ↑ R. Weryk; M. Rudenko; M. Micheli; et al. (23 January 2024). D. W. Green (ed.). "Comet P/2023 V7 = P/2004 DO29 (Spacewatch–LINEAR)". Central Bureau Electronic Telegrams. 5335: 1. Bibcode:2024CBET.5335....1W.
  9. ↑ S. Deen (22 April 2024). D. W. Green (ed.). "New Numberings of Short-Period Comets". Central Bureau Electronic Telegrams. 5386: 1. Bibcode:2024CBET.5386....1D.
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