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4383 Suruga, provisional designation 1989 XP, is a Vestian asteroid and binary system from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 1 December 1989, by Japanese astronomer Yoshiaki Oshima at Gekko Observatory, Japan.[10] The asteroid was named after the former Japanese Suruga Province. Its synchronous minor-planet moon, S/2013 (4383) 1, measures approximately 1.33 kilometers and has a period of 16.386 hours.

4383 Suruga
Discovery [1]
Discovered byY. Oshima
Discovery siteGekko Observatory
Discovery date1 December 1989
MPC designation(4383) Suruga
Named after
Suruga Province
(Japanese province)[2]
1989 XP · 1979 BE2
1981 UD10 · 1983 DN
1985 UL4 · 1985 VB4
main-belt · (inner) · Vestian[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc38.36 yr (14,012 days)
Aphelion2.5785 AU
Perihelion2.2725 AU
2.4255 AU
3.78 yr (1,380 days)
0° 15m 39.24s / day0
Known satellites1 [4][5]
Physical characteristics
Dimensions6.471±0.088 km[6][7]
7.13 km (calculated)[3]
3.811±0.005 h (dated)[8]
3.4069±0.0004 h[5]
0.20 (assumed)[3]
V[9] · S[3]
12.8[6] · 12.86±0.29[9] · 13.1[1][3]


Orbit and classificationEdit

Suruga is an orbital member of the Vesta family in the inner main-belt.[3] It orbits the Sun at a distance of 2.3–2.6 AU once every 3 years and 9 months (1,380 days). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid was first identified as 1979 BE2 at Crimea–Nauchnij in 1979. Its observation arc begins in 1981, when it was identified as 1981 UD10 at the Australian Siding Spring Observatory, extending the body's observation arc by 8 years prior to its official discovery observation.[10]

Physical characteristicsEdit

Suruga has been characterized as a bright V-type asteroid by PanSTARRS' photometric survey.[8][9]

Rotation and shapeEdit

In February 2013, a rotational lightcurve of Suruga was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (714) in Colorado. Lightcurve analysis gave a well-defined rotation period of 3.4069 hours with a brightness variation of 0.14 magnitude (U=3), which indicates a nearly spheroidal shape.[5]

These observations supersede a period of 3.4069 hours (Δmag 0.08) of an ambiguous lightcurve, obtained by Japanese astronomers during lightcurve survey of V-type asteroids in December 2002 (U=1+).[8]

Diameter and albedoEdit

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Suruga measures 6.471 kilometers in diameter and its surface has an albedo of 0.320,[6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.13 kilometers with an absolute magnitude of 13.1.[3]


During Brian Warner's photometric observations in 2013, it was revealed, that Suruga is a synchronous binary system with a minor-planet moon in orbit.[5] The satellite has an orbital period of 16.386. Based on the brightness variations of the mutual eclipsing/occulation events, Warner estimates that the satellite's mean-diameter is at least 21% of that of Suruga's (Ds/Dp of >0.21±0.02).[5] The Johnston's Archive derives a satellite diameter of 1.33 kilometer and estimates a semi-major axis of 11 kilometers for the moon's orbit.[4]


This minor planet was named after the former Suruga Province, what is now the Shizuoka Prefecture in central Japan. It is the place where the discovering Gekko Observatory is located (also see 4261 Gekko).[2] The approved naming citation was published by the Minor Planet Center on 28 May 1991 (M.P.C. 18307).[11]


  1. ^ a b c d "JPL Small-Body Database Browser: 4383 Suruga (1989 XP)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 15 June 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(4383) Suruga". Dictionary of Minor Planet Names – (4383) Suruga. Springer Berlin Heidelberg. p. 376. doi:10.1007/978-3-540-29925-7_4334. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (4383) Suruga". Asteroid Lightcurve Database (LCDB). Retrieved 15 June 2017.
  4. ^ a b Johnston, Robert (21 September 2014). "(4383) Suruga". Retrieved 15 June 2017.
  5. ^ a b c d e Warner, Brian D. (July 2013). "Something Old, Something New: Three Binary Discoveries from the Palmer Divide Observatory". The Minor Planet Bulletin. 40 (3): 119–121. Bibcode:2013MPBu...40..119W. ISSN 1052-8091. Retrieved 15 June 2017.
  6. ^ a b c d 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.
  7. ^ a b c 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. Retrieved 15 June 2017.
  8. ^ a b c Hasegawa, Sunao; Miyasaka, Seidai; Mito, Hiroyuki; Sarugaku, Yuki; Ozawa, Tomohiko; Kuroda, Daisuke; et al. (June 2014). "Lightcurve survey of V-type asteroids in the inner asteroid belt" (PDF). Publications of the Astronomical Society of Japan. 66 (3): 5415. arXiv:1311.4653. Bibcode:2014PASJ...66...54H. doi:10.1093/pasj/psu040. Retrieved 15 June 2017.
  9. ^ a b c 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 15 June 2017.
  10. ^ a b "4383 Suruga (1989 XP)". Minor Planet Center. Retrieved 15 June 2017.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 June 2017.

External linksEdit