(5648) 1990 VU1

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(5648) 1990 VU1
Discovery [1]
Discovered by K. Endate
K. Watanabe
Discovery site Kitami Obs.
Discovery date 11 November 1990
MPC designation (5648) 1990 VU1
1990 VU1
Jupiter trojan[2][3]
(Trojan camp)[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 66.87 yr (24,426 days)
Aphelion 6.0027 AU
Perihelion 4.3029 AU
5.1528 AU
Eccentricity 0.1649
11.70 yr (4,272 days)
0° 5m 3.48s / day
Inclination 22.693°
Jupiter MOID 0.0512 AU
TJupiter 2.8210
Physical characteristics
Dimensions 59.295±1.354[5][6]
66.92 km (calculated)[3]
16.04±0.01 h[7]
37.56±0.05 h[8]
37.6083±0.1028 h[9]
0.057 (assumed)[3]
9.6[3][5] · 9.692±0.001 (R)[9] · 9.7[1]

(5648) 1990 VU1 is a carbonaceous Jupiter trojan from the Trojan camp, approximately 60 kilometers in diameter. It was discovered on 11 November 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the northern island of Hokkaidō, Japan.[2]

Orbit and classification[edit]

The C-type Jovian asteroid orbits the Sun at a distance of 4.3–6.0 AU once every 11 years and 8 months (4,272 days). Its orbit has an eccentricity of 0.16 and an inclination of 23° with respect to the ecliptic.[1] The first precovery was taken at the U.S. Palomar Observatory in 1950, extending the asteroid's observation arc by 40 years prior to its discovery.[2]

Physical characteristics[edit]

Photometric observations of this asteroid during 1994, were used by astronomer Stefano Mottola to build a lightcurve showing a rotation period of 37.56 hours with a brightness variation of 0.20 magnitude (U=3-).[8] In 2013, the Palomar Transient Factory found concurring period of 37.6083 hours with an amplitude of 0.19 magnitude (U=2).[9]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 59.3 kilometers in diameter and its surface has an albedo of 0.073,[5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a somewhat larger diameter of 66.9 kilometers, as the lower a body's albedo (reflectivity), the larger its diameter at a certain absolute magnitude (brightness).[3]


  1. ^ a b c d "JPL Small-Body Database Browser: 5648 (1990 VU1)" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017. 
  2. ^ a b c "5648 (1990 VU1)". Minor Planet Center. Retrieved 29 June 2016. 
  3. ^ a b c d e f "LCDB Data for (5648)". Asteroid Lightcurve Database (LCDB). Retrieved 29 June 2016. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 29 June 2016. 
  5. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. 
  6. ^ a b c Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 14 December 2016. 
  7. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (5648)". Geneva Observatory. Retrieved 29 June 2016. 
  8. ^ a b Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. 
  9. ^ a b c 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. 

External links[edit]