15224 Penttilä

15224 Penttila
Discovery [1]
Discovered by E. Bowell
Discovery site Anderson Mesa Station
Discovery date 15 May 1985
Designations
MPC designation 15224 Penttila
Named after
 Antti Penttilä
(astronomer)[2]
1985 JG · 1970 HB
2000 HR19
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 45.30 yr (16,545 days)
Aphelion 3.0001 AU
Perihelion 1.8330 AU
2.4166 AU
Eccentricity 0.2414
3.76 yr (1,372 days)
41.185°
Inclination 12.346°
70.121°
196.29°
Physical characteristics
Dimensions 7.924±0.119 km[4]
8.79±3.79 km[5]
4.93 km (calculated)[3]
4.377±0.001 h[6]
4.3771±0.0064 h[7]
0.0849±0.0241[4]
0.069±0.175[5]
0.20 (assumed)[3]
S [3]
13.9[1][3]
13.8[4][5]
14.309±0.009 (S)[7]
13.988±0.006 (R)[7]

    15224 Penttila, provisional designation 1985 JG, is a stony asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by American astronomer Edward Bowell at Lowell's U.S. Anderson Mesa Station, Arizona, on 15 May 1985.[2]

    The S-type asteroid orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,372 days). Its orbit has an eccentricity of 0.24 and an inclination of 12° with respect to the ecliptic.[1] Due to precovery images taken at the Crimean Astrophysical Observatory in 1970, the asteroid's observation arc spans over a period of almost half a century.[2]

    In 2015, a photometric light-curve analysis by astronomre Daniel Klinglesmith at Etscorn Campus Observatory, New Mexico, gave it a rotation period of 4.377±0.001 hours with a brightness amplitude of 0.55 in magnitude (U=3-).[6] A nearly identical period of 4.3771±0.0064 hours with a magnitude variation of 0.46 was previously obtained at the U.S. Palomar Transient Factory, California, in 2012 (U=2).[7]

    According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 7.9 and 8.8 kilometers in diameter, with a low albedo of 0.085 and 0.069, respectively.[4][5] The Collaborative Asteroid Lightcurve Link (CALL), however, assumes a standard albedo for stony asteroids of 0.20, and hence calculates a smaller diameter of 4.9 kilometers.[3]

    The minor planet was named for Finish postdoctoral researcher Antti Penttilä (b. 1977) at the University of Helsinki. He is a specialist on the scattering and absorption of light by cosmic dust in cometary comae as well as on the surfaces of asteroids and cometary nuclei.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 15224 Penttila (1985 JG)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 3 4 "15224 Penttila (1985 JG)". Minor Planet Center. Retrieved April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (15224) Penttila". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    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. Retrieved April 2016.
    5. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved April 2016.
    6. 1 2 Klinglesmith, Daniel A., III; Hanowell, Jesse; Hendrickx, Sebastian; Madden, Karl; Montgomery, Samuel (October 2015). "Asteroids Observed at Etscorn Observatory: 2015 April - June". The Minor Planet Bulletin 42 (4): 251–252. Bibcode:2015MPBu...42..251K. ISSN 1052-8091. Retrieved April 2016.
    7. 1 2 3 4 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:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved April 2016.

    External links


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