(6491) 1991 OA

Last updated

(6491) 1991 OA
Discovery [1]
Discovered by H. E. Holt
Discovery site Palomar Obs.
Discovery date16 July 1991
Designations
(6491) 1991 OA
NEO  · Amor  · PHA [1]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 24.35 yr (8,895 days)
Aphelion 3.9772 AU
Perihelion 1.0227 AU
2.5000 AU
Eccentricity 0.5909
3.95 yr (1,444 days)
215.03°
0° 14m 57.48s / day
Inclination 5.9464°
301.90°
323.60°
Earth  MOID 0.0420 AU ·16.4 LD
Physical characteristics
Dimensions0.52 km (derived) [2]
2.69 h [3]
0.20 (assumed) [2]
S [2]
18.77 [2] [3]  ·18.9 [1]

    (6491) 1991 OA is a highly eccentric, stony asteroid, classified as near-Earth object and potentially hazardous asteroid, approximately half a kilometer in diameter. It was discovered on 16 July 1991, by American astronomer Henry E. Holt at the U.S. Palomar Observatory in California. [4]

    Contents

    Orbit and classification

    The S-type body is an Amor asteroid – a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. It orbits the Sun at a distance of 1.0–4.0  AU once every 3 years and 11 months (1,444 days). Its orbit has an eccentricity of 0.59 and an inclination of 6° with respect to the ecliptic. [1] Its minimum orbit intersection distance (MOID) with Earth is 0.0420  AU, and on 1 August 2086, it will make a close approach and pass by Earth at a distance of 0.09 AU (13,000,000 km). [5]

    A first precovery was taken at the Australian Siding Spring Observatory in March 1991, extending the asteroid's observation arc by 4 months prior to its discovery. [4]

    Physical characteristics

    In 2000, a rotational lightcurve was published from photometric observations obtained by the Near-Earth Objects Follow-up Program during the early 1990s. The lightcurve rendered a rotation period of 2.69 hours with an brightness amplitude of 0.08 in magnitude ( U=2 ). [3] The Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.20 and derives a diameter of 0.53 kilometers, based on an absolute magnitude of 18.77. [2]

    Naming

    As of 2017, 1991 OA remains unnamed. [4]

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    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 6491 (1991 OA)" (2015-07-25 last obs.). Jet Propulsion Laboratory . Retrieved 26 May 2017.
    2. 1 2 3 4 5 "LCDB Data for (6491)". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2016.
    3. 1 2 3 Erikson, A.; Mottola, S.; Lagerros, J. S. V.; Lindgren, M.; Piironen, J.; Oja, T.; et al. (October 2000). "The Near-Earth Objects Follow-up Program. III. 32 Lightcurves for 12 Objects from 1992 and 1995". Icarus. 147 (2): 487–497. Bibcode:2000Icar..147..487E. doi:10.1006/icar.2000.6457 . Retrieved 1 January 2016.
    4. 1 2 3 "6491 (1991 OA)". Minor Planet Center. Retrieved 24 July 2016.
    5. "JPL Close-Approach Data: 6491 (1991 OA)" . Retrieved 24 March 2012. 2011-09-29 last obs