.png) A three-dimensional model of 1862 Apollo based on itslight-curve | |||||||||||||||||
| Discovery[1] | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Discovered by | K. Reinmuth | ||||||||||||||||
| Discovery site | Heidelberg Obs. | ||||||||||||||||
| Discovery date | 24 April 1932 | ||||||||||||||||
| Designations | |||||||||||||||||
| (1862) Apollo | |||||||||||||||||
| Pronunciation | /əˈpɒloʊ/[2] | ||||||||||||||||
Named after | Apollo (Greek mythology) | ||||||||||||||||
| 1932 HA | |||||||||||||||||
| NEO · PHA Venus-crosser Mars-crosser Apollo asteroids | |||||||||||||||||
| Symbol | .svg) (astrological) | ||||||||||||||||
| Orbital characteristics[1] | |||||||||||||||||
| Epoch 29 December 2009 (JD 2455194.5) | |||||||||||||||||
| Uncertainty parameter 0 | |||||||||||||||||
| Observation arc | 85.32 yr (31162 days) | ||||||||||||||||
| Earliestprecovery date | 13 December 1930 | ||||||||||||||||
| Aphelion | 2.2935 AU (343.10 Gm) | ||||||||||||||||
| Perihelion | 0.64699 AU (96.788 Gm) | ||||||||||||||||
| 1.4702 AU (219.94 Gm) | |||||||||||||||||
| Eccentricity | 0.55994 | ||||||||||||||||
| 1.78yr (651.15d) | |||||||||||||||||
| 144.22° | |||||||||||||||||
| 0° 33m 10.332s / day | |||||||||||||||||
| Inclination | 6.3530° | ||||||||||||||||
| 35.739° | |||||||||||||||||
| 285.85° | |||||||||||||||||
| Earth MOID | 0.0257026 AU (3.84505 Gm) | ||||||||||||||||
| Jupiter MOID | 3.06837 AU (459.022 Gm) | ||||||||||||||||
| TJupiter | 4.415 | ||||||||||||||||
| Physical characteristics | |||||||||||||||||
| Dimensions | 1.5 km (0.93 mi)[3] | ||||||||||||||||
| 0.75km | |||||||||||||||||
| 3.065 h (0.1277 d) | |||||||||||||||||
| 0.25[1][3] | |||||||||||||||||
| |||||||||||||||||
| Q(Tholen,SMASS) B–V = 0.819 U–B = 0.481 | |||||||||||||||||
| 16.25[1] | |||||||||||||||||
1862 Apollo/əˈpɒloʊ/ is a stonyasteroid, approximately 1.5 kilometers in diameter, classified as anear-Earth object (NEO). It was discovered by German astronomerKarl Reinmuth atHeidelberg Observatory on 24 April 1932, but was lost and not recovered until 1973.
It is the namesake and the first recognized member of theApollo asteroids, a subgroup of NEOs which areEarth-crossers, that is, they cross the orbit of the Earth when viewed perpendicularly to the ecliptic plane (crossing an orbit is a more general term than actually intersecting it). In addition, since Apollo's orbit is highlyeccentric, it crosses the orbits of Venus and Mars and is therefore called aVenus-crosser andMars-crosser as well.
Although Apollo was the first Apollo asteroid to be discovered, its official IAU-number (1862) is higher than that of some other Apollo asteroids such as1566 Icarus, because it was alost asteroid for more than 40 years and other bodies were numbered in the meantime. The analysis of its rotation provided observational evidence of theYORP effect.[5]
It is named after the Greek godApollo, god of prophecy, music, healing and light, child of Zeus and Leto, after which the minor planets5731 Zeus and68 Leto are named.[6]
On 4 November 2005, it was announced that anasteroid moon, or satellite of Apollo, had been detected by radar observations fromArecibo Observatory,Puerto Rico, on 19 October – 2 November 2005. The announcement is contained in theInternational Astronomical Union Circular (IAUC) 8627.[7] The satellite is only 80 m (260 ft) across and orbits Apollo just 3 km (1.9 mi) away from the asteroid itself.[8] From the surface of Apollo, the satellite would have an angular diameter of about 2.0835 degrees.[a]
1862 Apollo is apotentially hazardous asteroid (PHA) because itsminimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters. Apollo's Earth MOID is 0.0257 AU (3,840,000 km; 2,390,000 mi).[1] Its 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) fromVenus.[1]
