(875163) 1998 SH2

Active asteroid or comet July 2026 yes (875163) 1998 SH 2 #FFC2E0 1998 SH 22016 EC 156MPEC_2016-E174 MPEC_1998-S10 Spacewatch Kitt Peak Observatory 17 September 1998 NEOApolloPHA jpldata 9 June 2026 (JD 2461200.5) 27.10 years 0MPC 0.785 AU 4.701 AU 2.743 AU 0.71379 4.543 years 2.426° 6.074° 268.72° 70.005° 0.2169764 ms / day 0.019 AU 0.499 AU jpldata Masiero_2017 20.88 0.383 ± 0.057 km mi 0.058 0.024 (875163) 1998 SH 2 is an Apollo-type near-Earth asteroid with an estimated diameter of about 383 m ft.Masiero_2017 It was discovered by the Spacewatch survey of the Kitt Peak National Observatory from Arizona, USA on 17 September 1998.MPEC_1998-S10 Physical characteristics Infrared observations from the NEOWISE spacecraft revealed that asteroid 1998 SH 2 may have a diameter of about 383 m ft assuming a geometric albedo of about 0.058.Masiero_2017 Astrometric measurements up to 2025 revealed orbital perturbations consistent with weak outgassing,Farnocchia_2026 indicating that this object might be also a comet.NASA-20260716 Orbit 2026 06, 1998 SH 2 currently has a perihelion of about 0.785 AU e6km unit and aphelion of about 4.701 AU e6km unit from the Sun, completing one revolution once every 4.54 years.MPC It made a close encounter with Earth at a distance of 0.0208 AU e6km unit on 30 August 2025.CBET_5716 By 2037, it will approach Jupiter at a distance of 0.98 AU e6km unit, followed by another Earth flyby at 0.0695 AU e6km unit away on 8 September 2052.CBET_5716 It is considered a potentially hazardous asteroid, however there is no significant impact risk with Earth in the foreseeable future.PHYS-20260715 See also Comet Spacewatch References R. Weryk R. Wainscoat L. Wells etal D. W. Green (875163) Comet P/1998 SH 2 P/2016 EC 156 http://www.cbat.eps.harvard.edu/iau/cbet/005700/CBET005716.txt Central Bureau Electronic Telegrams 2026-07-15 5716 1 TXT D. Farnocchia O. R. Hainaut D. Z. Seligment Non-gravitational acceleration indicative of cometary activity of near-Earth object https://www.nature.com/articles/s41550-026-02913-7.pdf Nature Astronomy 2026 10 9 1283–1291 2026NatAs..10.1283F 10.1038/s41550-026-02913-7 free 42755534 13581609 (875163) 1998 SH 2 – JPL Small-Body Database Lookup https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=875163 ssd.jpl.nasa.gov Jet Propulsion Laboratory 2026-07-18 J. R. Masiero C. Nugent A. K. Mainzer etal NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos The Astronomical Journal 2017 154 4 168–178 2017AJ....154..168M 1708.09504 10.3847/1538-3881/aa89ec free (875163) 1998 SH 2 2016 EC 156 https://www.minorplanetcenter.net/db_search/show_object?object_id=875163 Minor Planet Center 2026-07-19 A. Sugie G. J. Garradd F. B. Zoltowski etal G. V. Williams 1998 SH 2 https://www.minorplanetcenter.net/mpec/J98/J98S10.html Minor Planet Electronic Circular 1998-09-19 1998-S10 1998MPEC....S...10S A. F. Tubbiolo R. Matson G. V. Williams 1998 SH 2 2016 EC 156 https://www.minorplanetcenter.net/mpec/K16/K16EH4.html Minor Planet Electronic Circular 2016-E174 2016-03-15 2016MPEC....E..174T I. J. O'Neill K. Fox M. Wasser NASA Study Finds Near-Earth Asteroid Is Actually Comet https://www.jpl.nasa.gov/news/nasa-study-finds-near-earth-asteroid-is-actually-comet/ jpl.nasa.gov NASA / Jet Propulsion Laboratory 2026-07-16 2026-07-18 K. Kasal Asteroid with unexplained orbital shift turns out to be a 'dark comet' https://phys.org/news/2026-07-asteroid-unexplained-orbital-shift-dark.html Phys.org 2026-07-15 2026-07-19 External links (875163) 1998 SH 2 20875163 875163 (875163) 1998 SH 2 at the Minor Planet Center database 875163 (875163) 1998 SH 2 at Seiichi Yoshida's website (875162) 1997 GK28 875163 (875163) 1998 SH 2 (875164) 1998 SU15 Category:Active asteroids Category:Potentially hazardous asteroids Category:Apollo asteroids Category:Periodic comets # Category:Minor planet object articles (numbered) Category:Discoveries by the Spacewatch project * Category:Astronomical objects discovered in 1998