1425 Tuorla

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1425 Tuorla
Discovery [1]
Discovered by K. Inkeri
Discovery site Turku Obs.
Discovery date 3 April 1937
MPC designation (1425) Tuorla
Named after
Tuorla Observatory[2]
(Inst. for Astronomy and Optics)
1937 GB · 1950 KC
1950 LQ
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 67.14 yr (24,522 days)
Aphelion 2.8766 AU
Perihelion 2.3483 AU
2.6125 AU
Eccentricity 0.1011
4.22 yr (1,542 days)
0° 14m 0.24s / day
Inclination 12.975°
Physical characteristics
Dimensions 11.795±0.874 km[5]
14.34±1.08 km[6]
14.94±1.1 km[3][7]
6.76±0.01 h[a]
6.97±0.01 h[8]
7.748±0.0027 h[9]
7.75±0.06 h[10]
0.2389 (derived)[3]
11.173±0.003 (R)[9] · 11.30[3][5][6][7] · 11.4[1] · 11.91±0.41[11]

1425 Tuorla, provisional designation 1937 GB, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 3 April 1937, by Finnish astronomer Kustaa Inkeri at the Iso-Heikkilä Observatory in Turku, southwestern Finland.[12] The asteroid was named after the Tuorla Observatory of the University of Turku.[2] It was Kustaa Inkeri's only asteroid discovery.[13]

Orbit and classification[edit]

Tuorla is a member of the Eunomia family (502),[3][4] a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[14]:23 It orbits the Sun at a distance of 2.3–2.9 AU once every 4 years and 3 months (1,542 days). Its orbit has an eccentricity of 0.10 and an inclination of 13° with respect to the ecliptic.[1] The body's observation arc begins at Turku, the night before its official discovery observation.[12]

Physical characteristics[edit]

Tuorla has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey,[11] in accordance with the overall spectral type for members of the Eunomia family.[14]:23

Rotation period[edit]

In April 2013, the so-far best-rated a rotational lightcurve of Tuorla was obtained from photometric observations by astronomer Vladimir Benishek at Belgrade Observatory in Serbia. Lightcurve analysis gave a well-defined rotation period of 7.75 hours (h) with a brightness variation of 0.24 magnitude (U=3).[10] Other lightcurves were obtained by Alfonso Carreno Garceran (6.76 h),[a] Laurent Bernasconi (7.75 h),[8] and the Palomar Transient Factory (7.748 h),[9]

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, Tuorla measures between 11.795 and 14.94 kilometers in diameter and its surface has an albedo between 0.2390 and 0.383.[5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2389 and adopts a diameter of 14.94 kilometers from IRAS, based on an absolute magnitude of 11.3.[3]


This minor planet was named after the Tuorla Observatory, the Research Institute for Astronomy and Optics, of the University of Turku, located in Piikkiö near Turku, Finland.[2] The Tuorla Observatory was established by prolific minor-planet discoverer Yrjö Väisälä in 1952, as an alternative to the Iso-Heikkilä Observatory, where this asteroid was discovered. The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 2277).[15]

This asteroid was the only minor-planet discovery made by 1908–1997


  1. ^ a b Garceran (2013) web: rotation period hours with a brightness amplitude of mag. Summary figures for (1425) Tuorla at LCDB


  1. ^ a b c d "JPL Small-Body Database Browser: 1425 Tuorla (1937 GB)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 26 October 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1425) Tuorla. Springer Berlin Heidelberg. p. 114. ISBN 978-3-540-00238-3. Retrieved 26 October 2017. 
  3. ^ a b c d e f g "LCDB Data for (1425) Tuorla". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 October 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 26 October 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 26 October 2017. 
  7. ^ 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 October 2017. 
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1425) Tuorla". Geneva Observatory. Retrieved 26 October 2017. 
  9. ^ 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 2017. 
  10. ^ a b Benishek, Vladimir (April 2014). "Rotation Period Determination for 1425 Tuorla, 1468 Zomba, 1486 Marilyn, 2112 Ulyanov, and (101158) 2000 OL". The Minor Planet Bulletin. 41 (2): 126–127. Bibcode:2014MPBu...41..126B. ISSN 1052-8091. Retrieved 26 October 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 26 October 2017. 
  12. ^ a b "1425 Tuorla (1937 GB)". Minor Planet Center. Retrieved 26 October 2017. 
  13. ^ "Minor Planet Discoverers (by number)". Minor Planet Center. 5 October 2017. Retrieved 26 October 2017. 
  14. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 26 October 2017. 
  15. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 October 2017. 

External links[edit]