5380 Sprigg

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5380 Sprigg
Discovery  [1]
Discovered by R. H. McNaught
Discovery site Siding Spring Obs.
Discovery date7 May 1991
Designations
(5380) Sprigg
Named after
 Reg Sprigg
(Australian geologist) [2]
1991 JT ·1983 JN
1983 LA1
main-belt  ·(middle)  [3]
background
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 35.92 yr (13,118 days)
Aphelion 3.1229 AU
Perihelion 2.0357 AU
2.5793 AU
Eccentricity 0.2108
4.14 yr (1,513 days)
102.71°
0° 14m 16.44s / day
Inclination 9.3019°
242.31°
358.90°
Physical characteristics
Dimensions6.606±0.290 km [4] [5]
12.75 km (calculated) [3]
3.219±0.002 h [6]
0.057 (assumed) [3]
0.280±0.025 [4] [5]
X   [7]  · C   [3]
12.9 [4]  ·13.03±0.32 [7]  ·13.2 [1] [3]

    5380 Sprigg, provisional designation 1991 JT, is a background asteroid from the middle regions of the asteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 7 May 1991, by Australian astronomer Robert McNaught at Siding Spring Observatory in New South Wales, Australia. [8] It was named after Australian geologist Reg Sprigg. [2]

    Contents

    Orbit and classification

    Sprigg is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.0–3.1  AU once every 4 years and 2 months (1,513 days). Its orbit has an eccentricity of 0.21 and an inclination of 9° with respect to the ecliptic. [1] A first precovery was taken at Palomar Observatory in 1980, extending the body's observation arc by 11 years prior to its official discovery observation at Siding Spring. [8]

    Naming

    This minor planet was named after Reg Sprigg (1919–1994), Australian exploration geologist, oceanographer, biologist, author and conservationist. In 1946, he discovered the pre-Cambrian Ediacara biota, an assemblage of some of the most ancient animal fossils known. He is also the founder of the Arkaroola Wilderness Sanctuary which also hosts a small observatory. The naming was proposed by astronomer Duncan Steel. [2] Naming citation was prepared by the Sprigg family and published on 11 April 1998 ( M.P.C. 31609). [9]

    Physical characteristics

    Sprigg has been classified as an X-type asteroid by Pan-STARRS photometric survey. [7]

    Rotation period

    A rotational lightcurve of Sprigg was obtained from photometric observations by astronomer Maurice Clark at Texas Tech University in October 2013. Lightcurve analysis gave a rotation period of 3.219 hours with a brightness amplitude of 0.68 magnitude, indicating that the body has a non-spheroidal shape ( U=3- ). [6]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sprigg measures 6.606 kilometers in diameter and its surface has an albedo of 0.280, [4] [5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a larger diameter of 12.75 kilometers with an absolute magnitude of 13.2. [3]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 5380 Sprigg (1991 JT)" (2016-09-13 last obs.). Jet Propulsion Laboratory . Retrieved 20 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(5380) Sprigg". Dictionary of Minor Planet Names – (5380) Sprigg. Springer Berlin Heidelberg. p. 460. doi:10.1007/978-3-540-29925-7_5173. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (5380) Sprigg". Asteroid Lightcurve Database (LCDB). Retrieved 29 March 2017.
    4. 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.
    5. 1 2 3 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 29 March 2017.
    6. 1 2 Clark, Maurice (July 2014). "Asteroid Photometry from the Preston Gott Observatory". The Minor Planet Bulletin. 41 (3): 178–183. Bibcode:2014MPBu...41..178C. ISSN   1052-8091 . Retrieved 29 March 2017.
    7. 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 . Retrieved 29 March 2017.
    8. 1 2 "5380 Sprigg (1991 JT)". Minor Planet Center. Retrieved 29 March 2017.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 March 2017.
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