(8201) 1994 AH2

(8201) 1994 AH2 is a highly eccentric, rare-type asteroid, classified as near-Earth object of the Apollo group of asteroids, approximately 2 kilometers in diameter. It was discovered on 5 January 1994, by Australian amateur astronomer Gordon Garradd during the AANEAS survey at the Siding Spring Observatory, Australia.[7] It has an Earth minimum orbit intersection distance of 0.1 AU (15 million km) and is associated with the Beta Taurids daytime meteor shower.[8]

(8201) 1994 AH2
Discovery [1]
Discovered byG. J. Garradd
Discovery siteSiding Spring Obs.
Discovery date5 January 1994
Designations
(8201) 1994 AH2
1994 AH2
Apollo · NEO [1]
Alinda group
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc34.86 yr (12,731 days)
Aphelion4.3322 AU
Perihelion0.7436 AU
2.5379 AU
Eccentricity0.7070
4.04 yr (1,477 days)
285.46°
0° 14m 37.68s / day
Inclination9.5538°
164.12°
25.120°
Earth MOID0.1012 AU · 39.4 LD
Jupiter MOID0.6611 AU
Physical characteristics
Dimensions1.859±0.183 km[2][3]
2.17 km (calculated)[4]
2.2 km[5]
23.949 h[5][6]
24 h[lower-alpha 1]
0.15 (estimated)[5]
0.154±0.042[2][3]
0.18 (assumed)[4]
SMASS = O [1] · O [4][5]
15.8[1][4] · 16.3[2][5]

    Orbit and classification

    The asteroid orbits the Sun at a distance of 0.7–4.3 AU once every 4.04 years (1,477 days). Its orbit has an eccentricity of 0.71 and an inclination of 10° with respect to the ecliptic.[1] It is a member of the Alinda group of asteroids with a 3:1 resonance with Jupiter that has excited the eccentricity of the orbit over the eons.[9] As an Alinda asteroid it makes approaches to Jupiter, Earth, and Venus.[10]

    1994 AH2 has an Earth minimum orbital intersection distance of 0.1012 AU (15,100,000 km), which corresponds to 39.4 lunar distances. Due to its elongated orbit, it also approaches the orbit of Jupiter within 0.1022 AU (15,300,000 km).[1] On 4 January 2079, it will pass 0.3595 AU (53,800,000 km) from the Earth.[10]

    A first precovery was taken at the discovering observatory in 1981, extending the asteroid's observation arc by 13 years prior to its discovery.[7]

    Physical characteristics

    In the SMASS classification, 1994 AH2 is characterized as a rare O-type asteroid.[1]

    Rotation period

    In the late 1990s, Czech astronomer Petr Pravec obtained two rotational lightcurves for this asteroid from photometric observations taken at the Ondřejov Observatory, Czech Republic. They gave a longer-than average rotation period of 23.949 and 24 hours with a brightness variation of 0.27 and 0.3 magnitude, respectively (U=2/n.a.).[6][lower-alpha 1]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 1.86 kilometers in diameter and its surface has an albedo of 0.154.[2][3] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and calculates a diameter of 2.17 kilometers, based on an absolute magnitude of 15.8.[4] American astronomer Richard Binzel gives a diameter of 2.2 kilometers.[5]

    Naming

    As of 2017, 1994 AH2 remains unnamed.[7]

    Notes
    1. Pravec (1998) web: Observation from 15 July 1998. Rotation period 24 hours with a brightness amplitude of 0.3 mag. No quality rating available. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (8201) and Pravec, P.; Wolf, M.; Sarounova, L. (1998)
    gollark: Yes. This is why I never insult myself, but ironically praise myself.
    gollark: (which is also not plugged in)
    gollark: LyricLy's brain is isomorphic to the Raspberry Pi Zero I have on my desk somewhere.
    gollark: Hard to see, admittedly.
    gollark: I thought ✴️ was the standard unstar though.

    References
    1. "JPL Small-Body Database Browser: 8201 (1994 AH2)" (2016-10-24 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
    2. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    3. Mainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results". The Astrophysical Journal. 743 (2): 17. arXiv:1109.6400. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156.
    4. "LCDB Data for (8201)". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2016.
    5. Binzel, R. P.; Lupishko, D.; di Martino, M.; Whiteley, R. J.; Hahn, G. J. (March 2002). "Physical Properties of Near-Earth Objects" (PDF). Asteroids III: 255–271. Bibcode:2002aste.book..255B. Retrieved 1 September 2016.
    6. Pravec, Petr; Sarounová, Lenka; Wolf, Marek (December 1996). "Lightcurves of 7 Near-Earth Asteroids". Icarus. 124 (2): 471–482. Bibcode:1996Icar..124..471P. doi:10.1006/icar.1996.0223.
    7. "8201 (1994 AH2)". Minor Planet Center. Retrieved 1 September 2016.
    8. Babadzhanov, P. B. (2001). "Search for meteor showers associated with Near-Earth Asteroids". Astronomy and Astrophysics. 373 (1): 329–335. Bibcode:2001A&A...373..329B. doi:10.1051/0004-6361:20010583.
    9. John S Lewis (3 August 2015). "The Alinda Family of Asteroids". Retrieved 26 June 2019.
    10. "JPL Close-Approach Data: 8201 (1994 AH2)" (2016-08-27 last obs.). Jet Propulsion Laboratory. Retrieved 1 September 2016.

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