4451 Grieve

4451 Grieve, provisional designation 1988 JJ, is a stony asteroid and large Mars-crosser on an eccentric orbit from the central asteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 9 May 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The S-type asteroid is likely elongated and has a rotation period of 6.9 hours.[2] It was named for Canadian geologist Richard Grieve.[1]

4451 Grieve
Discovery [1]
Discovered byC. Shoemaker
Discovery sitePalomar Obs.
Discovery date9 May 1988
Designations
(4451) Grieve
Named after
Richard Grieve [1]
(Canadian geologist)
1988 JJ · 1971 GF
1980 VE1
Mars-crosser [1][2]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc63.12 yr (23,053 d)
Aphelion3.6024 AU
Perihelion1.6064 AU
2.6044 AU
Eccentricity0.3832
4.20 yr (1,535 d)
348.28°
0° 14m 4.2s / day
Inclination27.799°
219.38°
110.23°
Mars MOID0.4477 AU
Physical characteristics
Mean diameter
12.16±2.43 km[4]
6.864±0.006 h[5]
0.189[4]
SMASS = S [3][2]
Svw (Bus–DeMeo)[6]
12.00[1][3][2][4]

    Orbit and classification

    Grieve is a Mars-crossing asteroid, crossing the orbit of Mars at 1.666 AU. Members of this dynamically unstable group are located between the main belt and near-Earth populations. It orbits the Sun at a distance of 1.6–3.6 AU once every 4 years and 2 months (1,535 days; semi-major axis of 2.6 AU). Its orbit has an eccentricity of 0.38 and an inclination of 28° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at Palomar in 1954, or 34 years prior to its official discovery observation.[1]

    Physical characteristics

    In the SMASS classification, Grieve is a common, stony S-type asteroid.[3] In the Bus-DeMeo taxonomy it is a Svw-type.[6]

    Naming

    This minor planet was named after Canadian geologist Richard Grieve, chief of geophysics with the Geological Survey of Canada. He is a leading investigator of terrestrial and lunar impact craters and maintains the global census of recognized impact structures on Earth. Grieve has led the effort to reliably determine the ages for these structures and has classified impacts in molten rocks based on the abundance and distribution of siderophile elements.[1] The official naming citation was published by the Minor Planet Center on 30 January 1991 (M.P.C. 17657).[7]

    Rotation period

    In October 2001, a rotational lightcurve of Grieve was obtained from photometric observations by American astronomer Edwin E. Sheridan at the Crescent Butte Observatory (682) in Utah. Lightcurve analysis gave a rotation period of 6.864±0.006 hours with a brightness amplitude of 0.90 magnitude (U=3).[5] Alternative observations by Robert Stephens (6.85 h) and Pierre Antonini (6.8607 h) were very similar (U=3/3).[8]
    6.8607±0.0002 h[9] The lightcurve's high brightness variation is indicative of an elongated shape.

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Grieve measures 12.16 kilometers in diameter and its surface has an albedo of 0.189.[4] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 11.83 kilometers based on an absolute magnitude of 12.0.[2]

    This makes Grieve one of the largest Mars-crossing asteroids (MCAs) comparable with 1310 Villigera (13.76 km), as most mid-sized MCA's measure below 10 kilometers such as 1139 Atami (9.35 km), 1474 Beira (14.9 km), 1011 Laodamia (7.5 km), 1727 Mette (5.44 km), 1131 Porzia (7 km), 1235 Schorria (5.55 km), 985 Rosina (8.18 km) and 1468 Zomba (7 km). However, largest members of this dynamical group, namely, 132 Aethra, 1508 Kemi, 2204 Lyyli and 512 Taurinensis are all larger than 20 kilometers in diameter.[4]

    References
    1. "4451 Grieve (1988 JJ)". Minor Planet Center. Retrieved 31 August 2018.
    2. "LCDB Data for (4451) Grieve". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2018.
    3. "JPL Small-Body Database Browser: 4451 Grieve (1988 JJ)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 31 August 2018.
    4. Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics. 603: 8. arXiv:1705.10263. Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917.
    5. Sheridan, E. E. (June 2002). "Rotational Periods and Lightcurve Photometry of 697 Galilea, 1086 Nata, 2052 Tamriko, 4451 Grieve, and (27973) 1997 TR25". The Minor Planet Bulletin. 29: 32–33. Bibcode:2002MPBu...29...32S.
    6. "Asteroid 4451 Grieve". Small Bodies Data Ferret. Retrieved 31 August 2018.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 August 2018.
    8. Stephens, R. D. (June 2002). "Photometry of 1471 Tornio and 4451 Grieve". The Minor Planet Bulletin. 29: 34. Bibcode:2002MPBu...29...34S.
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (4451) Grieve". Geneva Observatory. Retrieved 31 August 2018.

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