1113 Katja

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1113 Katja
Discovery [1]
Discovered by P. Shajn
Discovery site Simeiz Obs.
Discovery date 15 August 1928
MPC designation (1113) Katja
Named after
Ekaterina Iosko [2]
(assistant at Simeiz Observatory)
1928 QC · A909 DH
main-belt · (outer)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 108.74 yr (39,719 days)
Aphelion 3.5537 AU
Perihelion 2.6687 AU
3.1112 AU
Eccentricity 0.1422
5.49 yr (2,004 days)
0° 10m 46.56s / day
Inclination 13.280°
Physical characteristics
Dimensions 38.20±0.58 km[5]
38.50±2.0 km[6]
38.65 km (derived)[3]
44.792±0.626 km[7]
51.949±1.531 km[8]
18±1 h[9]
18.42±0.02 h[9]
18.465±0.010 h[10]
18.47±0.05 h[9]
0.2253 (derived)[3]
9.30[1][3][7] · 9.40[5][6][8] · 9.49±0.20[12]

1113 Katja, provisional designation 1928 QC, is a background asteroid from the outer regions of the asteroid belt, approximately 39 kilometers in diameter. It was discovered by Pelageya Shajn at the Simeiz Observatory in 1928, and named after Ekaterina Iosko, a staff member at the discovering observatory.[2][13]


Katja was discovered on 15 August 1928, by Soviet astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula.[13] Nine nights later, it was independently discovered by Max Wolf at the German Heidelberg Observatory on 24 August 1928. The Minor Planet Center only recognizes the first discoverer.[2] The asteroid was first observed as A909 DH at Heidelberg on February 1909.[13]

Orbit and classification[edit]

Katja is a non-family asteroid of the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,004 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.14 and an inclination of 13° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, 10 days after its official discovery observation at Simeiz.[13]

Physical characteristics[edit]

Although Katja is an assumed, carbonaceous C-type asteroid, it is rather of stony composition due to its high albedo.[3]

Rotation period[edit]

Between 2002 and 2011, several rotational lightcurves of Katja were obtained from photometric observations by French amateur astronomers Maurice Audejean, René Roy and Laurent Brunetto (U=2/2/2-).[9] Best rated lightcurve, however, was obtained at the Sunflower (739), Blackberry (929) and Universidad de Monterrey (720) observatories in January 2002. Lightcurve analysis gave a well-defined synodic rotation period of 18.465 hours with a brightness amplitude of 0.17 magnitude (U=3).[10]

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, Katja measures between 38.20 and 51.949 kilometers in diameter and its surface has an albedo between 0.1144 and 0.211.[5][6][7][8][11]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2253 and a diameter of 38.65 kilometers based on an absolute magnitude of 9.3.[3]


This minor planet was named for Ekaterina ("Katja") Iosko, a laboratory assistant and orbit calculator at the discovering Simeiz Observatory (AN 238, 149). She was the daughter of Iosif Gavrilovich Iosko, who also worked as a mechanician at the observatory.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1113 Katja (1928 QC)" (2017-11-25 last obs.). Jet Propulsion Laboratory. Retrieved 26 January 2018.
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1113) Katja. Springer Berlin Heidelberg. p. 94. ISBN 978-3-540-00238-3. Archived from the original on 2016-04-24. Retrieved 26 January 2018.
  3. ^ a b c d e f g "LCDB Data for (1113) Katja". Asteroid Lightcurve Database (LCDB). Retrieved 26 January 2018.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 January 2018.
  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 26 January 2018.
  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. Archived from the original on 2016-06-03. Retrieved 26 January 2018.
  7. ^ 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 January 2018.
  8. ^ 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 January 2018.
  9. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1113) Katja". Geneva Observatory. Retrieved 26 January 2018.
  10. ^ a b Robinson, L. E.; Sada, P. V.; Cooney, W. R., Jr. (September 2002). "CCD Photometry of Asteroid 1113 Katja". The Minor Planet Bulletin. 29: 54. Bibcode:2002MPBu...29...54R. Retrieved 26 January 2018.
  11. ^ a b 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" (PDF). The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 26 January 2018.
  12. ^ 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. Retrieved 26 January 2018.
  13. ^ a b c d "1113 Katja (1928 QC)". Minor Planet Center. Retrieved 26 January 2018.

External links[edit]