2391 Tomita

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2391 Tomita
Discovery  [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date9 January 1957
Designations
(2391) Tomita
Named after
 Kōichirō Tomita
(Japanese astronomer) [2]
1957 AA ·1929 VX
1938 BF ·1942 DF
1957 BA ·1977 KM
1978 PA4 ·1980 DC6
main-belt  · Nysa   [3]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 87.07 yr (31,804 days)
Aphelion 2.7676 AU
Perihelion 2.1141 AU
2.4408 AU
Eccentricity 0.1339
3.81 yr (1,393 days)
345.07°
0° 15m 30.6s / day
Inclination 3.0111°
163.32°
282.65°
Physical characteristics
Dimensions9.17 km (calculated) [3]
15.07±4.33 km [4]
15.20±3.74 km [5]
16.62±0.23 km [6]
17.941±0.129 [7]
19.412±0.175 km [8]
7.9533±0.0005 h [lower-alpha 1]
8.435±0.079 h [lower-alpha 2]
0.0321±0.0044 [8]
0.06±0.03 [5]
0.070±0.004 [6]
0.07±0.07 [4] [7]
0.21 (assumed) [3]
S   [3]  · C   [9]
12.4 [4] [6] [8]  ·12.5 [1] [3]  ·12.66 [5]  ·12.74±0.28 [9]

    2391 Tomita, provisional designation 1957 AA, is a Nysian asteroid from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. The asteroid was discovered on 9 January 1957, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany. [10] It was named after Japanese astronomer Kōichirō Tomita. [2]

    Contents

    Orbit and classification

    Tomita is a member of the Nysa family, which is named after its most massive member 44 Nysa. It orbits the Sun in the inner main-belt at a distance of 2.1–2.8  AU once every 3 years and 10 months (1,393 days). Its orbit has an eccentricity of 0.13 and an inclination of 3° with respect to the ecliptic. [1]

    A first precovery was taken at Lowell Observatory in 1929, extending the body's observation arc by 28 years prior to its official discovery observation at Heidelberg. [10]

    Physical characteristics

    Tomita has been characterized as a stony S-type asteroid by the Collaborative Asteroid Lightcurve Link (CALL), and as a carbonaceous C-type asteroid by Pan-STARRS ' photometric survey. [3] [9]

    Diameter and albedo

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 15.07 and 19.4 kilometers in diameter and its surface has a low albedo between 0.03 and 0.07, respectively. [4] [5] [6] [7] [8]

    As CALL considers the body to be of a stony composition, it assumes a much higher albedo of 0.21 and calculates a diameter of 9.2 kilometers, as the higher the asteroid's reflectivity (albedo), the shorter its diameter at a constant absolute magnitude (brightness). [3]

    Rotation period

    In December 2013, two rotational lightcurves were obtained for this asteroid from photometric observations. They gave a rotation period of 7.9533±0.0005 and 8.435±0.079 hours with a brightness variation of 0.14 and 0.15 in magnitude, respectively. ( U=3/n.a. ). [lower-alpha 1] [lower-alpha 2]

    Naming

    This minor planet was named in honor of Japanese astronomer Kōichirō Tomita (1925–2006), long-time observer at the Tokyo Astronomical Observatory, and a discoverer of minor planets and comets himself. Tomita was also known as one of Japan's principal popularizer of astronomy. [2] The official naming citation was published by the Minor Planet Center on 14 April 1987 ( M.P.C. 11748). [11]

    Notes

    1. 1 2 Pravec (2013) web: lightcurve plot with a rotation period 7.9533±0.0005 hours with a brightness amplitude of 0.14 mag. Summary figures for (2391) Tomita at Collaborative Asteroid Lightcurve Link (CALL) and Pravec, P.; Wolf, M.; Sarounova, L. (2013)
    2. 1 2 Williams (2013) web: rotation period 8.435±0.079 hours with a brightness amplitude of 0.15 mag. Summary figures for (2391) Tomita at Collaborative Asteroid Lightcurve Link (CALL). Data by Williams, R. (2013), posted on CALL page.

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 2391 Tomita (1957 AA)" (2016-11-23 last obs.). Jet Propulsion Laboratory . Retrieved 13 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(2391) Tomita". Dictionary of Minor Planet Names – (2391) Tomita. Springer Berlin Heidelberg. p. 195. doi:10.1007/978-3-540-29925-7_2392. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 "LCDB Data for (2391) Tomita". Asteroid Lightcurve Database (LCDB). Retrieved 14 August 2016.
    4. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: 1509.02522 . Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID   9341381 . Retrieved 13 June 2017.
    5. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv: 1606.08923 . Bibcode:2016AJ....152...63N. doi: 10.3847/0004-6256/152/3/63 .
    6. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv: 1209.5794 . Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. S2CID   46350317 . Retrieved 14 August 2016.
    7. 1 2 3 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv: 1406.6645 . Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID   119293330 . Retrieved 7 December 2016.
    8. 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. S2CID   35447010 . Retrieved 14 August 2016.
    9. 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. S2CID   53493339 . Retrieved 14 August 2016.
    10. 1 2 "2391 Tomita (1957 AA)". Minor Planet Center. Retrieved 14 August 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 August 2016.
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