(38063) 1999 FH

(38063) 1999 FH is a rare-type asteroid from the inner regions of the asteroid belt, classified as Mars-crosser and exceptionally slow rotator, approximately 4 kilometers in diameter. It was discovered on 16 March 1999, by Croatian astronomers Korado Korlević and Mario Jurić at Višnjan Observatory in Croatia.[2]

(38063) 1999 FH
Discovery [1]
Discovered byK. Korlević
M. Jurić
Discovery siteVišnjan Obs.
Discovery date16 March 1999
Designations
(38063) 1999 FH
1999 FH · 2000 SY275
Mars-crosser [1][2][3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc25.07 yr (9,158 days)
Aphelion3.0288 AU
Perihelion1.6559 AU
2.3424 AU
Eccentricity0.2931
3.59 yr (1,309 days)
324.91°
0° 16m 29.64s / day
Inclination11.880°
193.25°
108.31°
Physical characteristics
Dimensions3.395±0.703 km[4]
3.92 km (calculated)[3]
4.17±0.42 km[5]
990±50 h[6][lower-alpha 1]
0.176±0.035[5]
0.20 (assumed)[3]
0.287±0.172[4]
L [7] · S [3]
14.00[7] · 14.4[1][3][4][5] · 14.50±0.13[8]

    Orbit and classification

    1999 FH orbits the Sun at a distance of 1.7–3.0 AU once every 3 years and 7 months (1,309 days). Its orbit has an eccentricity of 0.29 and an inclination of 12° with respect to the ecliptic.[1] A first precovery was taken at Steward Observatory in 1992, extending the body's observation arc by 7 years prior to its official discovery observation.[2]

    Physical characteristics

    SDSS photometry characterized 1999 FH as a rare and reddish L-type, which belong to the larger complex of stony asteroids.[7]

    Slow rotator and tumbler

    In September 2014, American astronomer Robert Stephens obtained a rotational lightcurve from photometric observations taken at the Center for Solar System Studies (CS3, U81) in California.[lower-alpha 1] It gave an exceptionally long rotation period of 990±50 hours with a brightness amplitude of 0.55 magnitude (U=2), which makes it one of the slowest rotators known to exist. It is also a suspected tumbling asteroid, which show a non-principal axis rotation.[6]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, 1999 FH measures 3.395 and 4.17 kilometers in diameter and its surface has an albedo of 0.287 and 0.176, respectively.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.4.[3]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 28 March 2002.[9] As of 2018, it has not been named.[2]

    Notes
    1. Robert Stephens light-curve plot of (38063) with a rotation period 990±50 hours and a brightness amplitude of 0.55 mag

    References
    1. "JPL Small-Body Database Browser: 38063 (1999 FH)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
    2. "38063 (1999 FH)". Minor Planet Center. Retrieved 15 January 2017.
    3. "LCDB Data for (38063)". Asteroid Lightcurve Database (LCDB). Retrieved 15 January 2017.
    4. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 15 January 2017.
    5. Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data" (PDF). Astronomy and Astrophysics. 603: 8. arXiv:1705.10263. Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917. Retrieved 21 October 2017.
    6. Stephens, Robert D. (January 2015). "Asteroids Observed from CS3: 2014 July - September". The Minor Planet Bulletin. 42 (1): 70–74. Bibcode:2015MPBu...42...70S. ISSN 1052-8091. Retrieved 15 January 2017.
    7. Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 15 January 2017.
    8. 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 January 2017.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

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