1582 Martir

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1582 Martir
Discovery [1]
Discovered by M. Itzigsohn
Discovery site La Plata Obs.
Discovery date 15 June 1950
MPC designation (1582) Martir
Named after
Eva Perón
(First Lady of Argentina)[2]
1950 LY
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 67.05 yr (24,490 days)
Aphelion 3.5573 AU
Perihelion 2.7521 AU
3.1547 AU
Eccentricity 0.1276
5.60 yr (2,047 days)
0° 10m 33.24s / day
Inclination 11.608°
Physical characteristics
Dimensions 34.42±10.19 km[4]
36.32±0.56 km[5]
36.69 km (derived)[3]
36.79±2.6 km[6]
37.06±12.76 km[7]
37.252±0.111 km[8]
39.47±0.46 km[9]
39.969±0.292 km[10]
9.84±0.01 h[11][a]
15.665±0.004 h (dated)[12]
15.757±0.005 h (dated)[13]
0.0435 (derived)[3]
10.90[5][6][10] · 11.20[3][7][9] · 11.26[4] · 11.3[1] · 11.35±0.29[14]

1582 Martir, provisional designation 1950 LY, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 15 June 1950, by Argentine astronomer Miguel Itzigsohn at the La Plata Astronomical Observatory in Argentina.[15] The asteroid was named after the First Lady of Argentina, Eva Perón.[2]

Orbit and classification[edit]

Martir is a background asteroid that does not belong to any known asteroid family. It orbits the Sun in the outer main-belt at a distance of 2.8–3.6 AU once every 5 years and 7 months (2,047 days). Its orbit has an eccentricity of 0.13 and an inclination of 12° with respect to the ecliptic.[1] The body's observation arc begins at the discovering observatory with its official discovery observation.[15]

Physical characteristics[edit]

Martir has been characterized as a carbonaceous C-type asteroid by PanSTARRS photometric survey.[14]

Rotation period[edit]

In May 2000, a rotational lightcurve of Martir was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. After a review of the previous lightcurve analysis, a half-period solution with a fit on a monomodal lightcurve gave a revised rotation period of 9.84 hours with a brightness amplitude of 0.31 magnitude (U=2).[11][a] This result supersedes two previous analysis that gave a period of 15.665 and 15.757 hours.[12][13]

Diameter and albedo[edit]

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, Martir measures between 34.42 and 39.969 kilometers in diameter and its surface has an albedo between 0.038 and 0.060.[4][5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0435 and a diameter of 36.69 kilometers based on an absolute magnitude of 11.2.[3]


This minor planet was named in homage to the First Lady of Argentina, Eva Perón (1919–1952). The name translates from Spanish to "martyr" and refers to her efforts towards social justice.[2]

The discoverer also named the asteroids 1569 Evita, 1581 Abanderada, 1588 Descamisada and 1589 Fanatica in tribute to Perón. The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 877).[16]


  1. ^ a b Lightcurve plot of 1582 Martir, Palmer Divide Observatory, B. D. Warner (2000), reviewed period of 9.84 hours


  1. ^ a b c d "JPL Small-Body Database Browser: 1582 Martir (1950 LY)" (2017-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 6 September 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1582) Martir. Springer Berlin Heidelberg. p. 125. ISBN 978-3-540-00238-3. Retrieved 6 September 2017. 
  3. ^ a b c d e f "LCDB Data for (1582) Martir". Asteroid Lightcurve Database (LCDB). Retrieved 6 September 2017. 
  4. ^ a b c d 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 6 September 2017. 
  5. ^ a b c d 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. Retrieved 6 September 2017. 
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 6 September 2017. 
  7. ^ a b c d 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 6 September 2017. 
  8. ^ 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 6 September 2017. 
  9. ^ 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 6 September 2017. 
  10. ^ 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 6 September 2017. 
  11. ^ a b Warner, Brian D. (October 2010). "Upon Further Review: II. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 37 (4): 150–151. Bibcode:2010MPBu...37..150W. ISSN 1052-8091. Retrieved 6 September 2017. 
  12. ^ a b Warner, Brian D. (September 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006". The Minor Planet Bulletin. 33 (3): 58–62. Bibcode:2006MPBu...33...58W. ISSN 1052-8091. Retrieved 6 September 2017. 
  13. ^ a b Warner, B. (December 2000). "Lightcurve Parameters for 1582 Martir". The Minor Planet Bulletin. 27: 53–54. Bibcode:2000MPBu...27...53W. Retrieved 6 September 2017. 
  14. ^ a b c 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 6 September 2017. 
  15. ^ a b "1582 Martir (1950 LY)". Minor Planet Center. Retrieved 6 September 2017. 
  16. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 September 2017. 

External links[edit]