7803 Adachi

7803 Adachi
Discovery [1]
Discovered by T. Kobayashi
Discovery site Ōizumi Obs.
Discovery date 4 March 1997
Designations
MPC designation 7803 Adachi
Named after
 Makoto Adachi
(amateur astronomer)[2]
1997 EW2 · 1973 AA3
1976 UY17 · 1978 EM1
1992 CF2
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 62.52 yr (22,835 days)
Aphelion 2.9254 AU
Perihelion 2.6445 AU
2.7850 AU
Eccentricity 0.0504
4.65 yr (1,698 days)
111.55°
0° 12m 43.2s / day
Inclination 4.9972°
110.63°
9.1781°
Physical characteristics
Dimensions 6.359±0.129 km[4]
10.31 km (calculated)[3]
5.1966±0.0082 h[5]
0.2513±0.0553[4]
0.057 (assumed)[3]
C [3] · S [6]
13.3[1]
13.65±0.27[6]
13.1[4]
13.212±0.005 (R)[5]
13.66[3]

    7803 Adachi, provisional designation 1997 EW2, is an asteroid from the outer region of the asteroid belt. It was discovered by Japanese amateur astronomer Takao Kobayashi at the Ōizumi Observatory in central Japan, on 4 March 1997.[7] Depending on the body's divergent spectral type assessment, it measures 6 or 10 kilometers in diameter.

    The asteroid orbits the Sun at a distance of 2.6–2.9 AU once every 4 years and 8 months (1,700 days). Its orbit has an eccentricity of 0.05 and an inclination of 5° with respect to the plane of the ecliptic.[1] Due to a precovery obtained at the U.S. Palomar Observatory in 1953, extending the asteroid's observation arc by 44 years prior to it discovery.[7]

    The Collaborative Asteroid Lightcurve Link (CALL) classifies this asteroid as a dark C-type with an assumed standard albedo of 0.057, and calculates a diameter of 10.3 kilometers.[3] However, the body has also been classified as a stony S-type by the large-scale Pan-STARRS survey.[6] This spectral type also agrees with the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), which gave a much higher albedo of 0.25. According to WISE, the asteroid's has a smaller diameter of 6.4 kilometers.[4]

    A rotational light-curve of this asteroid was obtained through photometric observations at the U.S. Palomar Transient Factory in August 2013. It showed a period of 5.1966±0.0082 hours with a brightness amplitude of 0.31 in magnitude (U=2).[5]

    The minor planet was named after Japanese amateur astronomer and elementary school teacher from Kyoto, Makoto Adachi (b. 1953). He is the director of the Oriental Astronomical Association and a long-time direct observer of the Solar System's planets, especially Jupiter.[2] Naming citation was published on 6 August 2003 (M.P.C. 49279).[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 7803 Adachi (1997 EW2)" (2016-04-17 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (7803) Adachi, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 36. ISBN 978-3-540-34360-8. Retrieved April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (7803) Adachi". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    4. 1 2 3 4 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. Retrieved April 2016.
    5. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved April 2016.
    6. 1 2 3 Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved April 2016.
    7. 1 2 "7803 Adachi (1997 EW2)". Minor Planet Center. Retrieved April 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved April 2016.

    External links


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