1257 Móra

1257 Móra

Discovery[1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	8 August 1932
Designations
MPC designation	(1257) Móra
Named after	Kráoly Móra (Hungarian astronomer)[2]
Alternative designations	1932 PE · 1928 QA 1935 KL · 1964 VO 1964 WA
Minor planet category	main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	88.80 yr (32,434 days)
Aphelion	2.6962 AU
Perihelion	2.2815 AU
Semi-major axis	2.4888 AU
Eccentricity	0.0833
Orbital period (sidereal)	3.93 yr (1,434 days)
Mean anomaly	335.03°
Mean motion	0° 15^m 3.6^s / day
Inclination	3.9231°
Longitude of ascending node	213.94°
Argument of perihelion	18.983°
Physical characteristics
Dimensions	10.79 km (derived)[3] 14.72±4.32 km[4] 17.05±6.10 km[5] 21.392±1.126 km[6][7] 21.47±0.64 km[8]
Synodic rotation period	5.28 h[9] 5.2948±0.0004 h[10] 5.3±0.1 h[10]
Geometric albedo	0.051±0.007[6][7] 0.08±0.07[5] 0.096±0.007[8] 0.10±0.07[4] 0.20 (assumed)[3]
Spectral type	C[9] · S[3] B–V = 0.630[1] U–B = 0.320[1]
Absolute magnitude (H)	11.50[8] · 12.00[5] · 12.09[4] · 12.1[1] · 12.2[3][6][9]

1257 Móra, provisional designation 1932 PE, is an asteroid from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 8 August 1932, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.[11] The asteroid was named after Hungarian astronomer Károly Móra [hu].[2]

Orbit and classification

Móra orbits the Sun in the inner main-belt at a distance of 2.3–2.7 AU once every 3 years and 11 months (1,434 days). Its orbit has an eccentricity of 0.08 and an inclination of 4° with respect to the ecliptic.[1] Identified as 1928 QA, it was first observed at Heidelberg and Algiers Observatory in 1928, extending the body's observation arc by 4 years prior to its official discovery observation.[11]

Physical characteristics

Rotation period

American astronomer Richard Binzel and French amateur astronomer René Roy obtained three rotational light curves of Móra from photometric observation taken in 1983 and 2009/11, respectively. Light curve analysis gave a well-defined rotation period between 2.28 and 2.30 hours with a change in brightness of 0.23 to 0.43 magnitude (U=3/2+/3).[9][10] The short period is just above the threshold of 2.2 hours for the so-called fast rotators.

Diameter, albedo and spectral type

According to the space-based surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Móra measures between 14.72 and 21.47 kilometers in diameter and its surface has an albedo between 0.051 and 0.10.[4][5][6][7][8]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony S-type asteroids of 0.20 and derives a shorter diameter of 10.79 kilometers,[3] while Richard Binzel classified it as a carbonaceous C-type asteroid during his photometric observations in the 1980s.[9]

Naming

This minor planet was named in honour of Hungarian astronomer Károly Móra (1899–1938). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 116). As a curiosity, astronomer Paul Wild reshuffled the letters and numbers of the designation "1257 Mora" to construct a name for his discovery 2517 Orma in 1968 (orma also means "trace, track" in Italian).[2]

References

1. "JPL Small-Body Database Browser: 1257 Mora (1932 PE)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 26 July 2017.
2. Schmadel, Lutz D. (2007). "(1257) Móra". Dictionary of Minor Planet Names – (1257) Móra. Springer Berlin Heidelberg. p. 104. doi:10.1007/978-3-540-29925-7_1258. ISBN 978-3-540-00238-3.
3. "LCDB Data for (1257) Móra". Asteroid Lightcurve Database (LCDB). Retrieved 25 January 2017.
4. 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. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
5. 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. S2CID 9341381. Retrieved 25 January 2017.
6. 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. S2CID 35447010.
7. 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. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497. Retrieved 25 January 2017.
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. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 25 January 2017.
10. Behrend, Raoul. "Asteroids and comets rotation curves – (1257) Móra". Geneva Observatory. Retrieved 25 January 2017.
11. "1257 Mora (1932 PE)". Minor Planet Center. Retrieved 25 January 2017.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1257 Móra at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1257 Móra at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters