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1102 Pepita

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Stony background asteroid

1102 Pepita
Lightcurve-based 3D-model of Pepita
Discovery
Discovered byJ. Comas Solà
Discovery siteFabra Obs.
Discovery date5 November 1928
Designations
MPC designation(1102) Pepita
Named afterJosep Comas i Solà
(discoverer himself)
Alternative designations1928 VA · 1960 WQ
A899 KB
Minor planet categorymain-belt · (outer)
background
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.24 yr (31,499 days)
Aphelion3.4119 AU
Perihelion2.7311 AU
Semi-major axis3.0715 AU
Eccentricity0.1108
Orbital period (sidereal)5.38 yr (1,966 days)
Mean anomaly267.80°
Mean motion0° 10 59.16 / day
Inclination15.828°
Longitude of ascending node216.59°
Argument of perihelion116.55°
Physical characteristics
Mean diameter30.88±1.59 km
36.632±0.378 km
39.27±2.1 km
41.02±0.74 km
41.733±0.308 km
Synodic rotation period5.1±0.1 h
5.1040±0.0003 h
5.10532±0.00005 h
5.1054±0.0002 h
Geometric albedo0.1842±0.0220
0.188±0.007
0.1991±0.023
0.229±0.054
0.322±0.058
Spectral typeTholen = C
SMASS = S
B–V = 0.724
U–B = 0.424
Absolute magnitude (H)8.68±0.65
9.40

1102 Pepita, provisional designation 1928 VA, is a stony background asteroid from the outer regions of the asteroid belt, approximately 39 kilometers in diameter. It was discovered on 5 November 1928, by Catalan astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona, Spain. It was named after the discoverer by the feminine form of his nickname. The asteroid has a rotation period of 5.1 hours.

Orbit and classification

Pepita is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4 AU once every 5 years and 5 months (1,966 days; semi-major axis of 3.07 AU). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.

In May 1899, the asteroid was first observed as A899 KB at Harvard's Boyden Station in Arequipa, Peru (800). The body's observation arc begins with its official discovery observation at Barcelona.

Physical characteristics

In the SMASS classification, Pepita is a stony S-type asteroid, which agrees with the body's measured geometric albedo (see below). Conversely, it is also classified as a carbonaceous C-type asteroid by Tholen.

Rotation period and poles

Three rotational lightcurves of Pepita were obtained from photometric observations by astronomers Hilari Pallares and Enric Forné (2006, U=2), Pierre Antonini and René Roy (2007, U=3), as well as by Robert Stephens (2007, U=3). The consolidated lightcurve gave a well-defined rotation period of 5.1054 hours with a brightness amplitude between 0.31 and 0.36 magnitude.

In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue and other sources gave a concurring sidereal period 5.10532 hours, as well as two spin axes of (25.0°, −34.0°) and (231.0°, −30.0°) in ecliptic coordinates (λ, β).

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Pepita measures between 30.88 and 41.733 kilometers in diameter and its surface has an albedo between 0.1842 and 0.322.

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1991 and a diameter of 39.27 kilometers based on an absolute magnitude of 9.40.

Naming

This minor planet was named after the discoverer, Josep Comas i Solà (1868–1937), by the feminine form of his nickname, "Pepito". He was the first director of the discovering Fabra Observatory and founded the Astronomical Society of Spain and America (Spanish: Sociedad Astronomica de España y América, SADEYA).

The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 104). The asteroid 1655 Comas Solà is also named after him, as is the Martian crater Comas Sola.

References

  1. ^ "JPL Small-Body Database Browser: 1102 Pepita (1928 VA)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 2 February 2018.
  2. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1102) Pepita. Springer Berlin Heidelberg. p. 94. doi:10.1007/978-3-540-29925-7_1103. ISBN 978-3-540-00238-3.
  3. ^ "LCDB Data for (1102) Pepita". Asteroid Lightcurve Database (LCDB). Retrieved 2 February 2018.
  4. ^ "Asteroid 1102 Pepita – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
  5. ^ 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.
  6. ^ Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  7. ^ Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  8. ^ Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  9. ^ 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.
  10. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1102) Pepita". Geneva Observatory. Retrieved 2 February 2018.
  11. ^ Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738.
  12. ^ Stephens, Robert D.; Sada, Pedro V. (December 2007). "Lightcurve Analysis of 1102 Pepita". The Minor Planet Bulletin. 34 (4): 111. Bibcode:2007MPBu...34..111S. ISSN 1052-8091.
  13. 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.
  14. ^ "1102 Pepita (1928 VA)". Minor Planet Center. Retrieved 2 February 2018.
  15. "Martian crater Comas Solá". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

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