4401 Aditi

4401 Aditi
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date 14 October 1985
Designations
MPC designation 4401 Aditi
Named after
 Aditi (Hindu goddess)[2]
1985 TB
Amor · NEO[3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 29.57 yr (10,800 days)
Aphelion 4.0366 AU
Perihelion 1.1224 AU
2.5795 AU
Eccentricity 0.5649
4.14 yr (1,513 days)
140.37°
0° 14m 16.44s / day
Inclination 26.651°
22.908°
68.156°
Earth MOID 0.3288 AU
Physical characteristics
Dimensions 1.801±0.535 km[4]
1.88 km (calculated)[5]
6.670±0.005 h[6]
6.683±0.005 h[7]
6.6780±0.0005 h[lower-alpha 1]
19.2±0.5 h[8]
0.343±0.204[4]
0.20 (assumed)[5]
S [5]
15.50[4]
16.0[1][5]

    4401 Aditi, provisional designation 1985 TB, is an eccentric, stony asteroid, classified as near-Earth object and Amor asteroid, about 1.8 kilometers in diameter. It was discovered by American female astronomer Carolyn Shoemaker at the U.S. Palomar Observatory, California, on 14 October 1985.[3]

    The S-type asteroid orbits the Sun at a distance of 1.1–4.0 AU once every 4 years and 2 months (1,513 days). Its orbit shows a typically high eccentricity of 0.56 and an inclination of 27 degrees from the plane of the ecliptic. The asteroid's observation arc begins with its discovery, as no precoveries were taken and no identifications were made before 1985.[3] With an Earth minimum orbit intersection distance (MOID) of 0.3288 AU (49,000,000 km), it never approaches Earth close enough to be classified as a potentially hazardous object, for which an upper MOID-limit of 0.05 AU is defined.[1]

    Two rotational light-curves were obtained by American astronomer Brian Warner at his Palmer Divide Observatory, Colorado, in August 2014 and March 2015, respectively. The first light-curve gave a period of 6.683±0.005 hours with a brightness variation of 0.64 (U=3-),[7] while the second light curve rendered a period of 6.670±0.005 hours with an amplitude of 0.29 in magnitude (U=3).[6] Other light-curve observations were performed by Benishek[lower-alpha 1] and Manzini.[8]

    According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the body has a high albedo of 0.34 with a corresponding diameter of 1.80 kilometers.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a slightly larger diameter of 1.88 kilometers, as the lower the body's albedo (reflectivity), the higher its diameter, at a constant absolute magnitude (brightness).[5]

    The minor planet is named after the Hindu goddess Aditi, celestial mother of every existing form and being. She was the mother of the thirty-three gods, including the Vasus, the Rudras, and the Ādityas, the twelve zodiacal spirits. She is described in Vedic literature as the gods of the heavenly light.[2] Naming citation was published on 30 January 1991 (M.P.C. 17656).[9]

    References

    1. 1 2 Benishek (2014) web: rotation period 19.2±0.5 hours with a brightness amplitude of 0.55 mag. No LCDB Quality Code available. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (4401) Aditi
    1. 1 2 3 4 "JPL Small-Body Database Browser: 4401 Aditi (1985 TB)" (2015-05-10 last obs.). Jet Propulsion Laboratory. Retrieved 4 June 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4401) Aditi. Springer Berlin Heidelberg. p. 378. ISBN 978-3-540-00238-3. Retrieved 4 June 2016.
    3. 1 2 3 "4401 Aditi (1985 TB)". Minor Planet Center. Retrieved 4 June 2016.
    4. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Cutri, R. M.; McMillan, R. S.; et al. (November 2012). "Physical Parameters of Asteroids Estimated from the WISE 3-Band Data and NEOWISE Post-Cryogenic Survey". The Astrophysical Journal Letters. 760 (1): 6. arXiv:1210.0502Freely accessible. Bibcode:2012ApJ...760L..12M. doi:10.1088/2041-8205/760/1/L12. Retrieved 1 February 2016.
    5. 1 2 3 4 5 "LCDB Data for (4401) Aditi". Asteroid Lightcurve Database (LCDB). Retrieved 4 June 2016.
    6. 1 2 Warner, Brian D. (July 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 January - March". The Minor Planet Bulletin. 42 (3): 172–183. Bibcode:2015MPBu...42..172W. ISSN 1052-8091. Retrieved 1 February 2016.
    7. 1 2 Warner, Brian D. (January 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October". The Minor Planet Bulletin. 42 (1): 41–53. Bibcode:2015MPBu...42...41W. ISSN 1052-8091. Retrieved 1 February 2016.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (4401) Aditi". Geneva Observatory. Retrieved 4 June 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 June 2016.

    External links

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