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 · (middle) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 63.65 yr (23,247 days)
Aphelion 2.9252 AU
Perihelion 2.6451 AU
2.7851 AU
Eccentricity 0.0503
4.65 yr (1,698 days)
196.60°
0° 12m 43.2s / day
Inclination 4.9971°
110.64°
8.9816°
Physical characteristics
Dimensions 6.359±0.129 km[4][5]
10.31 km (calculated)[3]
5.1966±0.0082 h[6]
0.057 (assumed)[3]
0.251±0.055[4][5]
C [3] · S [7]
13.1[4] · 13.212±0.005 (R)[6] · 13.3[1] · 13.65±0.27[7] · 13.66[3]

    7803 Adachi, provisional designation 1997 EW2, is an asteroid from the middle region of the asteroid belt, approximately 6 kilometers in diameter. The asteroid was discovered on 4 March 1997, by Japanese amateur astronomer Takao Kobayashi at the Ōizumi Observatory in central Japan.[8] It was named for Japanese amateur astronomer Makoto Adachi.

    Orbit and classification

    Adachi orbits the Sun in the central main-belt at a distance of 2.6–2.9 AU once every 4 years and 8 months (1,698 days). Its orbit has an eccentricity of 0.05 and an inclination of 5° with respect to the ecliptic.[1] The first precovery was taken at the U.S. Palomar Observatory in 1953, extending the asteroid's observation arc by 44 years prior to it discovery.[8]

    Physical characteristics

    Diameter, albedo and type

    The Collaborative Asteroid Lightcurve Link (CALL) classifies Adachi 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.[7] 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][5]

    Rotation period

    In August 2013, a rotational lightcurve of Adachi was obtained through photometric observations at the Palomar Transient Factory in California. It showed a period of 5.1966 hours with a brightness variation of 0.31 magnitude (U=2).[6]

    Naming

    This minor planet was named after Makoto Adachi (born 1953), Japanese amateur astronomer and elementary school teacher from Kyoto. He is the director of the Oriental Astronomical Association and a long-time direct observer of the Solar System's planets, especially Jupiter.[2] The approved naming citation was published by the Minor Planet Center on 6 August 2003 (M.P.C. 49279).[9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 7803 Adachi (1997 EW2)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
    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 28 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (7803) Adachi". Asteroid Lightcurve Database (LCDB). Retrieved 28 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407 Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 28 April 2016.
    5. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. Bibcode:2011ApJ...741...68M. arXiv:1109.4096 Freely accessible. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016.
    6. 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. Bibcode:2015AJ....150...75W. arXiv:1504.04041 Freely accessible. doi:10.1088/0004-6256/150/3/75. Retrieved 28 April 2016.
    7. 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762 Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 28 April 2016.
    8. 1 2 "7803 Adachi (1997 EW2)". Minor Planet Center. Retrieved 28 April 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 April 2016.
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