1862 Apollo

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1862 Apollo
1862Apollo (Lightcurve Inversion).png
A three-dimensional model of 1862 Apollo based on its light curve.
Discovery [1]
Discovered by Karl Reinmuth
Discovery site Heidelberg-Königstuhl State Observatory
Discovery date 24 April 1932
Named after
1932 HA
Apollo Apollo
Orbital characteristics[1]
Epoch 16 October 2009 (JD 2455120.5)
Uncertainty parameter 0
Observation arc 84.25 yr
Aphelion 2.2934 AU
Perihelion 0.64694 AU
1.4702 AU
Eccentricity 0.55995
1.78 yr (651.12 d)
22.50 km/s
Inclination 6.3529°
Physical characteristics
Dimensions 1.5 km (mean diameter)[2]
Mass 5.1×1012? kg
Mean density
2.0? g/cm³
0.0005? m/s²
3? km/h
0.12 d (3.065 h)
Albedo 0.25 (geometric)[2]
Temperature ~ 222 K
Spectral type

1862 Apollo /əˈpɒl/ is a Q-type asteroid, discovered by Karl Reinmuth in 1932, but lost and not recovered until 1973. It is named after the Greek god Apollo.

It is the namesake of the Apollo asteroids, and the first one discovered, although because it was lost for a time its asteroid number (1862) is higher than that of some other Apollo asteroids such as 1566 Icarus. Analysis of the spin of this object provided observational evidence of the YORP effect.

It was the first asteroid recognized to cross Earth's orbit. It is also a Venus- and Mars-crosser asteroid.


On November 4, 2005, it was announced that an asteroid moon, or satellite of Apollo, had been detected by radar observations from Arecibo Observatory, Puerto Rico, October 29 – November 2, 2005. The standard provisional designation for this satellite is S/2005 (1862) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8627 [1]. The satellite is just 80 m across and orbits Apollo closely, in an orbit a mere 3 km in radius [2].

Potentially hazardous object[edit]

1862 Apollo is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters. The Earth MOID is 0.0258 AU (3,860,000 km; 2,400,000 mi).[1] The orbit is well determined for the next several hundred years. On 17 May 2075 it will pass 0.0083 AU (1,240,000 km; 770,000 mi) from Venus.[1]

Further reading[edit]

See also[edit]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1862 Apollo (1932 HA)" (2015-03-16 last obs.). Jet Propulsion Laboratory. Retrieved September 2015. 
  2. ^ a b Gehrels, Tom (1994). Hazards Due to Comets and Asteroids. Tucson: University of Arizona Press. pp. 540–543. ISBN 0816515050. 

External links[edit]