15224 Penttilä

15224 PenttiläDiscovery[1]

Discovered by| E. Bowell
Discovery site| Anderson Mesa Stn.
Discovery date| 15 May 1985
Designations

MPC designation

| (15224) Penttilä
Named after| Antti Penttilä[1]
(Finnish astronomer)

Alternative designations

| 1985 JG * 1970 HB
2000 HR19
Minor planet category| main-belt[1][2] * (inner)
background[3][4]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc| 48.02 yr (17,539 d)
|{{{apsis}}}|helion}}| 3.0019 AU
|{{{apsis}}}|helion}}| 1.8313 AU

Semi-major axis

| 2.4166 AU
Eccentricity| 0.2422
Orbital period| 3.76 yr (1,372 d)
Mean anomaly| 356.13°
Mean motion| 0° 15m 44.64s / day
Inclination| 12.350°
Longitude of ascending node| 70.116°

|{{{apsis}}}|helion}}

| 196.23°
Physical characteristics
Mean diameter| 7.924±0.119 km[5][6][7]
8.79±3.79 km[8]
9.60±2.05 km[9]
Rotation period| 4.377±0.001 h[10]
Geometric albedo| 0.04–0.085[5][6][7][8][9]
Absolute magnitude (H)| 13.80[5][7][8]
13.9[1][2][11]
14.13[9]

15224 Penttilä (provisional designation 1985 JG) is a dark background asteroid from the inner regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 15 May 1985, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States.[1] The likely elongated asteroid has a rotation period of 4.4 hours.[11] It was named after planetary scientist Antti Penttilä at the University of Helsinki.[1]

## Contents

* 1 Orbit and classification
* 2 Naming
* 3 Physical characteristics
* 3.1 Rotation period
* 3.2 Diameter and albedo
* 4 References
* 5 External links

## Orbit and classification

Penttilä is a non-family asteroid from the main belt's background population.[3][4] It orbits the Sun in the inner asteroid belt at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,372 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.24 and an inclination of 12° with respect to the ecliptic.[2]

The body's observation arc begins with its first observation, a precovery taken at the Crimean Astrophysical Observatory in April 1970, or 15 years prior to its official discovery observation at Anderson Mesa Station.[1]

## Naming

This minor planet was named for Finnish postdoctoral researcher Antti Penttilä (born 1977) at the University of Helsinki, an expert on light reflection and absorption on the surface of small Solar System bodies such as asteroids and cometary nuclei, as well as of the cosmic dust released by cometary comae.[1] The official naming citation was published on 12 July 2014 (M.P.C. 89081).[12]

## Physical characteristics

The asteroid's spectral type has not been determined.[3] Due to its low geometric albedo, it likely a carbonaceous C-type asteroid (see below).

### Rotation period

In June 2015, a rotational lightcurve was obtained for this asteroid from photometric observations by astronomer Daniel Klinglesmith at Etscorn Campus Observatory (719), New Mexico. Lightcurve analysis gave a rotation period of 4.377±0.001 hours with a brightness variation of 0.55 in magnitude ({{{1}}}), indicative of a non-spherical, elongated shape.[10] Previously, in August 2012, a concurring period of 4.3771±0.0064 hours with an amplitude of 0.46 was determined from observations in the R-band by astronomers at the Palomar Transient Factory, California ({{{1}}}).[13]

### Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Penttilä measures between 7.9 and 9.6 kilometers in diameter and its surface has an albedo between 0.04 and 0.085.[5][6][7][8][9] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, and hence calculates a smaller diameter of 4.9 kilometers.[11]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "15224 Penttila (1985 JG)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=15224.
2. ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 15224 Penttila (1985 JG)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015224.
3. ↑ 3.0 3.1 3.2 "Asteroid 15224 Penttila". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15224+Penttila.
4. ↑ 4.0 4.1 "Asteroid (15224) Penttila – Proper elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=15224&pc=1.1.6.
5. ↑ 5.0 5.1 5.2 5.3 Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R. et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode: 2016PDSS..247.....M. https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab. Retrieved 5 December 2018.
6. ↑ 6.0 6.1 6.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M.
7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. (catalog)
8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M.
9. ↑ 9.0 9.1 9.2 9.3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N.
10. ↑ 10.0 10.1 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. ISSN 1052-8091. Bibcode: 2015MPBu...42..251K.
11. ↑ 11.0 11.1 11.2 "LCDB Data for (15224) Penttilä". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=15224|Penttilä.
12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
13. ↑ 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. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center
* 15224 Penttilä at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 15224 Penttilä at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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