1546 Izsák

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1546 Izsák
Discovery [1]
Discovered by G. Kulin
Discovery site Konkoly Obs.
Discovery date 28 September 1941
MPC designation (1546) Izsák
Named after
Imre Izsák[2]
(Hungarian astronomer)
1941 SG1 · 1935 QC
1938 FH · 1978 BF
main-belt · (outer)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 81.86 yr (29,898 days)
Aphelion 3.5686 AU
Perihelion 2.7886 AU
3.1786 AU
Eccentricity 0.1227
5.67 yr (2,070 days)
0° 10m 26.04s / day
Inclination 16.138°
Physical characteristics
Dimensions 19.31±0.85 km[5]
26.08±1.45 km[6]
26.438±0.139 km[7]
28.487±0.110 km[8]
42.23 km (calculated)[3]
7.33200±0.00005 h[9]
7.350±0.006 h[10][a]
0.057 (assumed)[3]
X[11] · M[8] · C[3]
10.60[3][6] · 10.68±0.37[11] · 10.70[1][5][8]

1546 Izsák, provisional designation 1941 SG1, is a background asteroid from the outer regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 28 September 1941, by Hungarian astronomer György Kulin at the Konkoly Observatory near Budapest, Hungary.[12] The asteroid was named after Hungarian astronomer Imre Izsák.[2]

Orbit and classification[edit]

Izsák is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,070 days). Its orbit has an eccentricity of 0.12 and an inclination of 16° with respect to the ecliptic.[1]

The body's observation arc begins with its identification as 1935 QC at Simeiz Observatory in August 1935, more than 6 years prior to its official discovery observation at Konkoly.[12]

Physical characteristics[edit]

Izsák has been characterized as a generic X-, a metallic M- and a carbonaceous C-type asteroid, by PanSTARRS photometric survey, by the Wide-field Infrared Survey Explorer (WISE) and by the Lightcurve Data Base, respectively.[3][8][11]

Rotation period[edit]

In April 2006, a rotational lightcurve of Izsák was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado (716). Lightcurve analysis gave a well-defined rotation period of 7.350 hours with a brightness amplitude of 0.31 magnitude (U=3).[10][a]


In 2016, a modeled lightcurve gave a concurring period of 7.33200 hours and determined two spin axis of (124.0°, 32.0°) and (322.0°, 60.0°) in ecliptic coordinates (λ, β).[9]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Izsák measures between 19.31 and 28.487 kilometers in diameter and its surface has an albedo between 0.1153 and 0.249.[5][6][7][8]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 42.23 kilometers based on an absolute magnitude of 10.6.[3]


This minor planet was named in memory of Imre Izsák (1929–1965), a Hungarian-born astronomer and celestial mechanician, who studied the motion of artificial satellites. He also worked at the Cincinnati Observatory and the Smithsonian Astrophysical Observatory in the United States.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5182).[13] He is also honored by a lunar crater Izsak.[2]


  1. ^ a b Lightcurve plot of 1546 Izsák, Palmer Divide Observatory, Brian D. Warner (2006). Summary figures at the LCDB


  1. ^ a b c d "JPL Small-Body Database Browser: 1546 Izsak (1941 SG1)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 28 September 2017. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1546) Izsák. Springer Berlin Heidelberg. p. 122. ISBN 978-3-540-00238-3. Retrieved 28 September 2017. 
  3. ^ a b c d e f g "LCDB Data for (1546) Izsák". Asteroid Lightcurve Database (LCDB). Retrieved 28 September 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 28 September 2017. 
  5. ^ 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 28 September 2017. 
  6. ^ 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 28 September 2017. 
  7. ^ 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 28 September 2017. 
  8. ^ a b c d e f 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 28 September 2017. 
  9. ^ a b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network" (PDF). Astronomy and Astrophysics. 586: 24. arXiv:1510.07422Freely accessible. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 28 September 2017. 
  10. ^ a b Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - March - June 2006". The Minor Planet Bulletin. 33 (4): 85–88. Bibcode:2006MPBu...33...85W. ISSN 1052-8091. Retrieved 28 September 2017. 
  11. ^ 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 28 September 2017. 
  12. ^ a b "1546 Izsak (1941 SG1)". Minor Planet Center. Retrieved 28 September 2017. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 September 2017. 

External links[edit]