99942 Apophis
near-Earth asteroid
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Summary
99942 Apophis is a potentially hazardous asteroid[1]. It ranks in the top 0.68% of potentially hazardous asteroid entities by monthly Wikipedia readership (14,210 views/month, #1 of 147).[2]
Key Facts
- Discoverer or inventor: David J. Tholen[3], Fabrizio Bernardi[4], Roy A. Tucker[5]
- Instance of: near-Earth asteroid[6], near-Earth object[7]
- Site of astronomical discovery: Kitt Peak National Observatory[8]
- Named after: Apophis[9]
- Follows: 99941 Lonniewege[10]
- Followed by: (99943) 2005 AS2[11]
- Minor planet group: Aten asteroid[12]
- Commons category: 99942 Apophis[13]
- Parent astronomical body: Sun[14]
- Provisional designation: 2004 MN4[15]
- Catalog code: 2004 MN4[16]
- Time of discovery or invention: June 19, 2004[17]
- Asteroid spectral type: S-type asteroid[18]
- Significant event: naming[19]
- Topic's main category: Category:99942 Apophis[20]
- Commons gallery: (99942) Apophis[21]
- Orbital eccentricity: 0.1911663355386932[22]
- Apparent magnitude: 21.69[23]
- Absolute magnitude: 19.09[24]
- Orbital inclination: 3.340958441017069 degree[25]
- Mass: 61,000,000,000 kg[26]
- Orbital period: 323.5664375491271 day[27]
- Rotation period: 30.56 hour[28]
- Longitude of ascending node: 203.8996515621043 degree[29]
- Semi-major axis of an orbit: 0.9223803173917017 astronomical unit[30]
Why It Matters
99942 Apophis has Wikipedia articles in 28 language editions, a strong signal of global cultural recognition.[31] It is known by 77 alternative names across languages and contexts.[32]