Amor Asteroid
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Amor Asteroid
The Amor asteroid group compared to the orbits of the terrestrial planets of the Solar System.
  Mars (M)
  Mars trojans
  Venus (V)
  Mercury (H)
  Sun
  Amor asteroids
  Earth (E)

The Amor asteroids are a group of near-Earth asteroids named after the archetype object 1221 Amor. The orbital perihelion of these objects is close to, but greater than, the orbital aphelion of Earth (i.e., the objects do not cross Earth's orbit),[1] with most Amors crossing the orbit of Mars. The Amor asteroid 433 Eros was the first asteroid to be orbited and landed upon by a robotic space probe (NEAR Shoemaker).

Definition

Amor asteroid Eros visited by NEAR Shoemaker in 2000

The orbital characteristics that define an asteroid as being in the Amor group are:[2]

  • The orbital period is greater than one year; i.e., the orbital semi-major axis (a) is greater than 1.0 AU (a > 1.0 AU);
  • The orbit does not cross that of Earth; i.e., the orbital perihelion (q) is greater than Earth's orbital aphelion (q > 1.017 AU);
  • The object is a near-Earth object (NEO); i.e., q < 1.3 AU.

Populations

As of 2019 there are 7427 known Amor asteroids.[3] 1153 are numbered, and 75 of them are named.[4]

Outer Earth-grazer asteroids

An outer Earth-grazer asteroid is an asteroid that is normally beyond Earth's orbit, but which can get closer to the Sun than Earth's aphelion (1.0167 AU), and not closer than Earth's perihelion (0.9833 AU); i.e., the asteroid's perihelion is between Earth's perihelion and aphelion. Outer Earth-grazer asteroids are split between Amor and Apollo asteroids. Using the definition of Amor asteroids above, "Earth grazers" that never get closer to the Sun than Earth does (at any point along its orbit) are Amors, whereas those that do are Apollos.

Potentially hazardous asteroids

To be considered a potentially hazardous asteroid (PHA), an object's orbit must, at some point, come within 0.05 AU of Earth's orbit, and the object itself must be sufficiently large/massive to cause significant regional damage if it impacted Earth.[5] Most PHAs are either Aten asteroids or Apollo asteroids (and thus have orbits that cross the orbit of Earth), but approximately one tenth of PHAs are Amor asteroids. A potentially hazardous Amor asteroid therefore must have a perihelion of less than 1.05 AU. Approximately 20% of the known Amors meet this requirement, and about a fifth of those are PHAs. The fifty known Amor PHAs include the named objects 2061 Anza, 3122 Florence, 3908 Nyx, and 3671 Dionysus.

Lists

Prominent Amor asteroids

Name Year Discoverer Refs
3908 Nyx 1980 Hans-Emil Schuster MPC · JPL · LCDB
1221 Amor 1932 Eugène Delporte MPC · JPL · LCDB
1036 Ganymed 1924 Walter Baade MPC · JPL · LCDB
887 Alinda 1918 Max Wolf MPC · JPL · LCDB
719 Albert 1911 Johann Palisa MPC · JPL · LCDB
433 Eros 1898 Gustav Witt MPC · JPL · LCDB

Named Amor asteroids

This is a non-static list of named Amor asteroids.[6]

Designation Prov. designation
433 Eros 1898 DQ
719 Albert 1911 MT
887 Alinda 1918 DB
1036 Ganymed 1924 TD
1221 Amor 1932 EA1
1580 Betulia 1950 KA
1627 Ivar 1929 SH
1915 Quetzalcoatl 1953 EA
1916 Boreas 1953 RA
1917 Cuyo 1968 AA
1943 Anteros 1973 EC
1980 Tezcatlipoca 1950 LA
2059 Baboquivari 1963 UA
2061 Anza 1960 UA
2202 Pele 1972 RA
2368 Beltrovata 1977 RA
2608 Seneca 1978 DA
3102 Krok 1981 QA
3122 Florence 1981 ET3
3199 Nefertiti 1982 RA
3271 Ul 1982 RB
3288 Seleucus 1982 DV
3352 McAuliffe 1981 CW
3551 Verenia 1983 RD
3552 Don Quixote 1983 SA
Designation Prov. designation
3553 Mera 1985 JA
3671 Dionysus 1984 KD
3691 Bede 1982 FT
3757 Anagolay 1982 XB
3908 Nyx 1980 PA
3988 Huma 1986 LA
4055 Magellan 1985 DO2
4401 Aditi 1985 TB
4487 Pocahontas 1987 UA
4503 Cleobulus 1989 WM
4947 Ninkasi 1988 TJ1
4954 Eric 1990 SQ
4957 Brucemurray 1990 XJ
5324 Lyapunov 1987 SL
5332 Davidaguilar 1990 DA
5370 Taranis 1986 RA
5620 Jasonwheeler 1990 OA
5653 Camarillo 1992 WD5
5751 Zao 1992 AC
5797 Bivoj 1980 AA
5863 Tara 1983 RB
5869 Tanith 1988 VN4
5879 Almeria 1992 CH1
6050 Miwablock 1992 AE
6456 Golombek 1992 OM

See also

References

  1. ^ "Amor asteroid". astronomy encyclopedia. .. Retrieved .
  2. ^ "NEO Groups". NASA/JPL Near-Earth Object Program Office. Retrieved .
  3. ^ List of Amor asteroids generated by the JPL Small-Body Database Search Engine Retrieved 2019-04-03
  4. ^ List of numbered Amor asteroids generated by the JPL Small-Body Database Search Engine Retrieved 2018-11-15
  5. ^ "List Of The Potentially Hazardous Asteroids (PHAs)". The International Astronomical Union Minor Planet Center. IAU - Minor Planet Center. Retrieved .
  6. ^ "List Of Amor Minor Planets (by designation)". Minor Planet Center. Retrieved 2017.

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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