(23958) 1998 VD30

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(23958) 1998 VD30
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date10 November 1998
Designations
(23958) 1998 VD30
1998 VD30 · 1986 WG9
Minor planet category
Jupiter trojan[1][2]
Greek[3] · background[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc30.86 yr (11,272 d)
Aphelion5.7455 AU
Perihelion4.7171 AU
5.2313 AU
Eccentricity0.0983
11.97 yr (4,370 d)
186.20°
0° 4m 56.64s / day
Inclination24.901°
225.44°
234.89°
Jupiter MOID0.0976 AU
TJupiter2.8050
Physical characteristics
Mean diameter
46.00±1.19 km[5]
47.91±4.66 km[6]
562±4 h[7]
0.076±0.013[5]
0.084±0.017[6]
C (assumed)[8]
V–I = 0.990±0.029[8]
BR = 1.150±0.041[8]
Absolute magnitude (H)
9.90[6]
10.10[5]
10.2[1][2][8]

(23958) 1998 VD30, provisional designation 1998 VD30, is a Jupiter trojan from the Greek camp, approximately 47 kilometers (29 miles) in diameter. It was discovered on 10 November 1998, by astronomers with the LINEAR survey at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.[1] The dark Jovian asteroid belongs to the 110 largest Jupiter trojans and shows an exceptionally slow rotation of 562 hours.[8] It has not been named since its numbering in April 2001.[9]

Orbit and classification[]

1998 VD30 is a dark Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[4] It orbits the Sun at a distance of 4.7–5.7 AU once every 12 years (4,370 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.10 and an inclination of 25° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1986 WG9 at the Kiso Observatory in November 1986, or 12 years prior to its official discovery observation at Socorro.[1]

Numbering and naming[]

This minor planet was numbered by the Minor Planet Center on 8 April 2001 (M.P.C. 42554).[9] As of 2018, it has not been named.[1]

Physical characteristics[]

1998 VD30 is an assumed, carbonaceous C-type asteroid.[8] Most Jupiter trojans are D-types, with the reminder being mostly C and P-type asteroids. It has a typical V–I color index of 0.99 and a BR-color of 1.15.[8]

Rotation period[]

With a rotation period of 562 hours, this slow rotator belongs to the Top 100 slowest rotators known to exist. It is also the third-slowest rotator among the larger Jupiter trojans after 4902 Thessandrus (738 hours) and (7352) 1994 CO (648 hours).

In August 2015, a rotational lightcurve of 1998 VD30 was obtained from photometric observations by the Kepler space observatory during its K2 mission. Lightcurve analysis gave an exceptionally long period of 562±4 hours with a brightness amplitude of 0.45 magnitude, somewhat indicative of a non-spherical shape (U=2).[7] A second, lower-rated lightcurve from Kepler gave an alternative, even longer period of 1143±155 hours (U=2).[8][10]

These results supersede a poor period determination made at the Sierra Nevada Observatory in 2007, which gave a period 12.080 hours (U=1).[8][11]

Diameter and albedo[]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, 1998 VD30 measures 46.00 and 47.91 kilometers in diameter and its surface has an albedo between 0.076 and 0.084, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a larger diameter of 50.77 kilometers based on an absolute magnitude of 10.2.[8]

100+ largest Jupiter trojans

References[]

  1. ^ Jump up to: a b c d e f "23958 (1998 VD30)". Minor Planet Center. Retrieved 27 June 2018.
  2. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 23958 (1998 VD30)" (2017-10-10 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2018.
  3. ^ "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 27 June 2018.
  4. ^ Jump up to: a b "Asteroid (23958) 1998 VD30 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 27 June 2018.
  5. ^ Jump up to: a b c d 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:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  6. ^ Jump up to: a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  7. ^ Jump up to: a b Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116.
  8. ^ Jump up to: a b c d e f g h i j "LCDB Data for (23958)". Asteroid Lightcurve Database (LCDB). Retrieved 27 June 2018.
  9. ^ Jump up to: a b "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 June 2018.
  10. ^ Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. S2CID 119275951.
  11. ^ Duffard, R. D.; Melita, M.; Ortiz, J. L.; Licandro, J.; Williams, I. P.; Jones, D. (December 2007). "Light-Curve Survey of the Trojan Asteroids" (PDF). Asteroids. 1405: 8187. Bibcode:2008LPICo1405.8187D. Retrieved 27 June 2018.

External links[]

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