15350 Naganuma

15350 Naganuma, provisional designation 1994 VB2, is a stony background asteroid from the inner regions of the asteroid belt, approximately 4.3 kilometers (2.7 miles) in diameter. It was discovered on 3 November 1994, by Japanese astronomers Yoshio Kushida and Osamu Muramatsu at the Yatsugatake South Base Observatory. The likely S-type asteroid has a rotation period of 2.5 hours.[9] It was named for the town of Naganuma in northern Japan.[1]

15350 Naganuma
Discovery [1]
Discovered byY. Kushida
O. Muramatsu
Discovery siteYatsugatake Obs.
Discovery date3 November 1994
Designations
(15350) Naganuma
Named after
Naganuma [1]
(Japanese town)
1994 VB2 · 1998 WQ19
main-belt [1][2] · (inner)
background [3][4]
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc23.69 yr (8,652 d)
Aphelion3.0346 AU
Perihelion1.7301 AU
2.3823 AU
Eccentricity0.2738
3.68 yr (1,343 d)
240.74°
0° 16m 4.8s / day
Inclination4.6159°
197.86°
204.64°
Physical characteristics
Mean diameter
4.357±0.070 km[5][6][7]
2.5835±0.0001 h[8][lower-alpha 1]
0.256[5][6][7]
S (assumed)[9]
13.90[5][7]
14.1[1][2]

    Orbit and classification

    Naganuma is a non-family asteroid from the main belt's background population.[3][4] It orbits the Sun in the inner asteroid belt at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,343 days; semi-major axis of 2.38 AU). Its orbit has an eccentricity of 0.27 and an inclination of 5° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at the Yatsugatake South Base Observatory in November 1994.[1]

    Naming

    This minor planet was named after the town of Naganuma, located on the island of Hokkaido in northern Japan, where the "Artists Atelier Village" was promoted for many years with more than 20 workshops.[1] The official naming citation was published by the Minor Planet Center on 13 October 2000 (M.P.C. 41387).[10]

    Physical characteristics

    Naganuma is an assumed S-type asteroid,[9] which agrees with its determined geometric albedo (see below).

    Rotation period

    In November 2005, a rotational lightcurve of Naganuma was obtained from photometric observations by Donald Pray at the Carbuncle Hill Observatory (912) on Rhode Island, United States. Lightcurve analysis gave a rotation period of 2.5835±0.0001 hours with a brightness amplitude of 0.20 magnitude (U=3).[8] Concurring periods of 2.58348, 2.5835 and 2.587 hours were also determined by Vladimir Benishek at Sopot Astronomical Observatory (K90) and Petr Pravec at Ondřejov Observatory (U=2/2+/2+).[11][lower-alpha 1]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Naganuma measures 4.36 kilometers in diameter and its surface has an albedo if 0.256.[5][6][7] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-albedo of 0.20 and calculates diameter of 4.34 kilometers based on an absolute magnitude of 14.16.[9][12]

    Notes
    1. Three lightcurve plots of (15350) Naganuma from 2005, 2010, 2016. Summary figures at the LCDB and Ondrejov NEO Photometric Program with Ondrejov data sheet. Pravec in October 2016, rotation period 2.58348 hours with a brightness amplitude of 0.17 mag. Quality code is 2+.

    References
    1. "15350 Naganuma (1994 VB2)". Minor Planet Center. Retrieved 4 December 2018.
    2. "JPL Small-Body Database Browser: 15350 Naganuma (1994 VB2)" (2018-07-12 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2018.
    3. "Asteroid 15350 Naganuma". Small Bodies Data Ferret. Retrieved 4 December 2018.
    4. "Asteroid (15350) Naganuma". AstDyS-2, Asteroids – Dynamic Site. Retrieved 4 December 2018.
    5. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M. Retrieved 4 December 2018.
    6. 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. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
    7. 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. (catalog)
    8. Pray, Donald P.; Galad, Adrian; Gajdos, Stefan; Vilagi, Jozef; Cooney, Walt; Gross, John; et al. (December 2006). "Lightcurve analysis of asteroids 53, 698, 1016, 1523, 1950, 4608, 5080 6170, 7760, 8213, 11271, 14257, 15350 and 17509". The Minor Planet Bulletin. 33 (4): 92–95. Bibcode:2006MPBu...33...92P. ISSN 1052-8091.
    9. "LCDB Data for (15350) Naganuma". Asteroid Lightcurve Database (LCDB). Retrieved 4 December 2018.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 December 2018.
    11. Benishek, Vladimir (January 2017). "Lightcurves and Rotation Periods for Six Asteroids". The Minor Planet Bulletin. 44 (1): 67–69. Bibcode:2017MPBu...44...67B. ISSN 1052-8091.
    12. Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026.

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