List of Aten asteroids
This is a list of Aten asteroids, a group of near-Earth objects. As of January 2017, there are 1125 known Atens,[1] most of which remain provisionally designated without a number,[2] as they have not been observed at two or more oppositions. The list is divided into named members, brightest, notable and other record holding Aten asteroids. For a list of existing articles, see Aten asteroids (category).
Named Atens
As of August 2015, a total of twelve Aten asteroids have received a name. They are listed in chronological order of discovery.
| Number | Name | Year | Discoverer |
|---|---|---|---|
| 2062 | Aten | 1976 | Eleanor F. Helin |
| 2340 | Hathor | 1976 | Charles T. Kowal |
| 2100 | Ra-Shalom | 1978 | Eleanor F. Helin |
| 3362 | Khufu | 1984 | R. Scott Dunbar, Maria A. Barucci |
| 3554 | Amun | 1986 | Carolyn S. Shoemaker, Eugene M. Shoemaker |
| 3753 | Cruithne | 1986 | J. Duncan Waldron |
| 5381 | Sekhmet | 1991 | Carolyn S. Shoemaker |
| 136818 | Selqet | 1997 | Roy Tucker |
| 326290 | Akhenaten | 1998 | Roy Tucker |
| 99942 | Apophis | 2004 | Roy Tucker, David J. Tholen i Fabrizio Bernardi |
| 163693 | Atira | 2003 | LINEAR |
| 367943 | Duende | 2012 | Observatorio Astronómico de La Sagra (OAM) |
The February 15, 2013 Earth encounter shortened 367943 Duende orbital period to about 317 days, changing its orbital class from Apollo to Aten.[3]
Brightest Atens
The following lists Aten asteroids thought to be larger than 2 kilometers across. Assuming an albedo of 0.15, this converts to an absolute magnitude of about 16.2
| Designation | Discovery date | Absolute magnitude | Diameter (km) | Catalog |
|---|---|---|---|---|
| (66146) 1998 TU3 | 1998/10/13 | 14.5 | 3–7 | list entry |
| (137170) 1999 HF1 | 1999/04/20 | 14.5 | 3–7 | list entry |
| 3753 Cruithne | 1986/10/10 | 15.6 | 2–5 | list entry |
| (152931) 2000 EA107 | 2000/03/15 | 15.8 | 2–4 | list entry |
| (105140) 2000 NL10 | 2000/07/10 | 15.8 | 2–4 | list entry |
| 3554 Amun | 1986/03/04 | 15.82 | 2.33–2.82 | list entry |
| (87684) 2000 SY2 | 2000/09/20 | 16.0 | 2–4 | list entry |
| 2100 Ra-Shalom | 1978/09/10 | 16.05 | 2.05–2.59 | list entry |
| (96590) 1998 SB | 1998/12/01 | 16.2 | 1–3 | list entry |
Selection of designated Atens
Record-holding Atens
The following is a list of current records for Aten asteroids
| Discovery Records | |||
|---|---|---|---|
| Record | Object | Date | |
| First Detected | (363505) 2003 UC20 | 5 December 1954 | |
| First Confirmed | 2062 Aten | 7 January 1976 | |
| Physical Records | |||
| Record | Object | Absolute magnitude | Diameter |
| Brightest | (137170) 1999 HF1 | 14.5 | 4.3 km |
| Brightest (numbered) | (66146) 1998 TU3 | 14.7 | 3.6 km |
| Brightest (named) | 3753 Cruithne | 15.1 | 3.3 km |
| Smallest (named) | 3362 Khufu | 18.3 | 700 m |
| Dimmest | 2003 SW130 | 29.1 | 5 m |
| Dimmest (numbered) | (68347) 2001 KB67 | 19.9 | 505 m |
| Dimmest (named) | 2340 Hathor | 19.2 | 210 m |
| Orbital Records | |||
| Perihelion Records | Object | q (AU) | notes |
| Smallest | (137924) 2000 BD19 | 0.092 | smallest of all asteroids |
| Smallest (named) | 2340 Hathor | 0.464 | |
| Largest (numbered) | 2062 Aten | 0.790 | |
| Largest | 2002 AA29 | 0.984 | Earth Co-Orbital |
| Semi-Major Axis Records | Object | a (AU) | notes |
| Smallest | (434326) 2004 JG6 | 0.635 | Apohele asteroid, smallest of all asteroids |
| Smallest (numbered) | (66391) 1999 KW4 | 0.642 | |
| Smallest (named) | 2100 Ra-Shalom | 0.832 | |
| Largest (numbered) | 3753 Cruithne | 0.998 | Earth Co-Orbital |
| Largest | (85770) 1998 UP1 | 0.999 | In Earth's Zone of Influence |
| Aphelion Records | Object | Q (AU) | notes |
| Smallest | (434326) 2004 JG6 | 0.973 | Apohele asteroid, smallest of all asteroids |
| Smallest (numbered) | (33342) 1998 WT24 | 1.019 | smallest of all numbered asteroids |
| Smallest (named) | 2062 Aten | 1.143 | smallest of all named asteroids |
| Largest (named) | 3753 Cruithne | 1.511 | Earth Co-Orbital |
| Largest | (66063) 1998 RO1 | 1.705 | In Earth's Zone of Influence, Binary |
| Eccentricity Records | Object | e | notes |
| Smallest | 2002 AA29 | 0.013 | Earth Co-Orbital |
| Smallest (numbered) | 2062 Aten | 0.183 | |
| Largest (named) | 3753 Cruithne | 0.515 | Earth Co-Orbital |
| Largest | (137924) 2000 BD19 | 0.895 | |
| Inclination Records | Object | i (deg) | notes |
| Smallest | 2004 FH | 0.0° | |
| Smallest (numbered) | (65679) 1989 UQ | 1.3° | |
| Smallest (named) | 2340 Hathor | 5.9° | |
| Largest (numbered) | 5381 Sekhmet | 49.0° | |
| Largest | (333889) 1998 SV4 | 53.3° | |
References
- ↑ "Near-Earth Asteroid Discovery Statistics". 5 January 2017. Retrieved 7 January 2017.
- ↑ "List Of Aten Minor Planets (by designation)". Minor Planet Center. Retrieved 7 January 2017.
- ↑ Paul Chodas and Don Yeomans (1 February 2013). "Asteroid 2012 DA14 To Pass Very Close to the Earth on February 15, 2013". NASA/JPL Near-Earth Object Program Office. Retrieved 17 February 2013.