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(875163) 1998 SH2

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(Redirected from P/1998 SH2)

(875163) 1998 SH2
Discovery[1]
Discovered bySpacewatch
Discovery siteKitt Peak Observatory
Discovery date17 September 1998
Designations
1998 SH2 · 2016 EC156[2]
NEO · Apollo · PHA
Orbital characteristics[3]
Epoch 9 June 2026 (JD 2461200.5)
Uncertainty parameter 0[4]
Observation arc27.10 years
Aphelion4.701 AU
Perihelion0.785 AU
2.743 AU
Eccentricity0.71379
4.543 years
70.005°
0° 13m 1.115s / day
Inclination2.426°
6.074°
268.72°
Earth MOID0.019 AU
Jupiter MOID0.499 AU
Physical characteristics[3][5]
0.383 ± 0.057 km (0.238 ± 0.035 mi)
0.058±0.024
20.88

(875163) 1998 SH2 is an Apollo-type near-Earth asteroid with an estimated diameter of about 383 m (1,257 ft).[5] It was discovered by the Spacewatch survey of the Kitt Peak National Observatory from Arizona, USA on 17 September 1998.[1]

Physical characteristics

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Infrared observations from the NEOWISE spacecraft revealed that asteroid 1998 SH2 may have a diameter of about 383 m (1,257 ft) assuming a geometric albedo of about 0.058.[5] Astrometric measurements up to 2025 revealed orbital perturbations consistent with weak outgassing,[6] indicating that this object might be also a comet.[7]

Orbit

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As of June 2026, 1998 SH2 currently has a perihelion of about 0.785 AU (117.4 million km) and aphelion of about 4.701 AU (703.3 million km) from the Sun, completing one revolution once every 4.54 years.[4]

It made a close encounter with Earth at a distance of 0.0208 AU (3.11 million km) on 30 August 2025.[8] By 2037, it will approach Jupiter at a distance of 0.98 AU (147 million km), followed by another Earth flyby at 0.0695 AU (10.40 million km) away on 8 September 2052.[8] It is considered a potentially hazardous asteroid, however there is no significant impact risk with Earth in the foreseeable future.[9]

See also

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References

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  1. 1 2 A. Sugie; G. J. Garradd; F. B. Zoltowski; et al. (19 September 1998). G. V. Williams (ed.). "1998 SH2". Minor Planet Electronic Circular. 1998-S10. Bibcode:1998MPEC....S...10S.
  2. ↑ A. F. Tubbiolo; R. Matson (15 March 2016). G. V. Williams (ed.). "1998 SH2 = 2016 EC156". Minor Planet Electronic Circular. 2016-E174. Bibcode:2016MPEC....E..174T.
  3. 1 2 "(875163) 1998 SH2 – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 18 July 2026.
  4. 1 2 "(875163) = 1998 SH2 = 2016 EC156". Minor Planet Center. Retrieved 19 July 2026.
  5. 1 2 3 J. R. Masiero; C. Nugent; A. K. Mainzer; et al. (2017). "NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos". The Astronomical Journal. 154 (4): 168–178. arXiv:1708.09504. Bibcode:2017AJ....154..168M. doi:10.3847/1538-3881/aa89ec.
  6. ↑ D. Farnocchia; O. R. Hainaut; D. Z. Seligment (2026). "Non-gravitational acceleration indicative of cometary activity of near-Earth object" (PDF). Nature Astronomy. 10 (9): 1283–1291. Bibcode:2026NatAs..10.1283F. doi:10.1038/s41550-026-02913-7. PMC 13581609. PMID 42755534.
  7. ↑ I. J. O'Neill; K. Fox; M. Wasser (16 July 2026). "NASA Study Finds Near-Earth Asteroid Is Actually Comet". jpl.nasa.gov. NASA / Jet Propulsion Laboratory. Retrieved 18 July 2026.
  8. 1 2 R. Weryk; R. Wainscoat; L. Wells; et al. (15 July 2026). D. W. Green (ed.). "(875163) = Comet P/1998 SH2 = P/2016 EC156" (TXT). Central Bureau Electronic Telegrams (5716): 1.
  9. ↑ K. Kasal (15 July 2026). "Asteroid with unexplained orbital shift turns out to be a 'dark comet'". Phys.org. Retrieved 19 July 2026.
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