1179 Mally

From Wikipedia, the free encyclopedia
Jump to: navigation, search
1179 Mally
Discovery [1]
Discovered by M. F. Wolf
Discovery site Heidelberg Obs.
Discovery date 19 March 1931
MPC designation 1179 Mally
Named after
Mally Wolf
(discoverer's family)[2]
1931 FD
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 85.23 yr (31,131 days)
Aphelion 3.0675 AU
Perihelion 2.1695 AU
2.6185 AU
Eccentricity 0.1715
4.24 yr (1,548 days)
0° 13m 57.36s / day
Inclination 8.7071°
Physical characteristics
Dimensions 10.65 km (calculated)[3]
13.159±0.183 km[4]
13.379±0.077 km[5]
14.41±0.47 km[6]
46.6917±0.1516 h[7]
0.10 (assumed)[3]
12.530±0.002 (R)[7] · 12.8[1] · 12.9[5][6] · 12.98[3]

1179 Mally, provisional designation 1931 FD, is an asteroid and long-lost minor planet from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 19 March 1931, by German astronomer Max Wolf at Heidelberg Observatory in Southern Germany.[8]

Mally orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 3 months (1,548 days). Its orbit has an eccentricity of 0.17 and an inclination of 9° with respect to the ecliptic.[1] After its initial discovery in 1931, it became one of few well known lost minor planets for over 55 years. In 1986, Mally was rediscovered by Lutz D. Schmadel, Richard Martin West and Hans-Emil Schuster, who remeasured the original discovery plates and computed alternative search ephemerides. This allowed them to find the body very near to its predicted position. In addition, historic photographic plates from the Palomar Sky Survey (1956–1958), the UK Schmidt Telescope (Australia), and the ESO Schmidt Telescope (Chile) confirmed the rediscovery.[9][10][11]

According to the 2014-published results from the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Mally measures between 13.2 and 14.4 kilometers in diameter, and its surface has an albedo between 0.059 and 0.071,[4][5][6] while the Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.10 and calculates a diameter of 10.7 kilometers, based on an absolute magnitude of 12.98.[3] In addition, CALL classifies it as a stony S-type body, despite its low albedo.[3]

In September 2013, a rotational light-curve of Mally was obtained from photometric observations taken at the Palomar Transient Factory in California. It gave a longer than average rotation period of 46.6 hours with a brightness variation of 0.08 magnitude.[7] However, the result is rejected by CALL (U=1).[3]

The minor planet was named after Mally Wolf, wife of Franz Wolf and the discoverer's daughter-in-law (H 110).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1179 Mally (1931 FD)" (2016-06-11 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1179) Mally. Springer Berlin Heidelberg. p. 99. ISBN 978-3-540-00238-3. Retrieved 26 October 2016. 
  3. ^ a b c d e f g h "LCDB Data for (1179) Mally". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2016. 
  4. ^ a b c 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 14 September 2016. 
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 October 2016. 
  6. ^ a b c d 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 October 2016. 
  7. ^ a b c 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 26 October 2016. 
  8. ^ "1179 Mally (1931 FD)". Minor Planet Center. Retrieved 26 October 2016. 
  9. ^ Brian G. Marsden (5 December 1986). "International Astronomical Union Circular 4278". Central Bureau for Astronomical Telegrams. Retrieved 26 October 2016. 
  10. ^ "Long Lost Planet Found Again" (Press release). Garching, Germany: European Southern Observatory. 4 December 1986. Retrieved 26 October 2016. 
  11. ^ Schmadel, L. D.; West, R. M. (1988). "Recovery of the long lost minor planet (1179) Mally". Astronomische Nachrichten. Astronomisches Rechen-Institut, and ESO. 309 (3): 223–225. Bibcode:1988AN....309..223S. doi:10.1002/asna.2113090318. ISSN 0004-6337. Retrieved 26 October 2016. 

External links[edit]