2429 Schürer

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2429 Schürer
Discovery [1]
Discovered by P. Wild
Discovery site Zimmerwald Obs.
Discovery date 12 October 1977
MPC designation (2429) Schurer
Named after
Max Schürer
1977 TZ · A915 TB
Eunomia[3] · Maria[4]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 100.66 yr (36,765 days)
Aphelion 2.8327 AU
Perihelion 2.3121 AU
2.5724 AU
Eccentricity 0.1012
4.13 yr (1,507 days)
0° 14m 20.04s / day
Inclination 15.057°
Physical characteristics
Dimensions 11.03 km (calculated)[3]
11.582±0.133 km[5]
12.517±0.026 km[6]
15.95±0.38 km[7]
15.99±0.26 km[8]
6.66±0.05 h[9]
7.070 h[4]
7.45±0.01 h[a]
0.21 (assumed)[3]
11.9[6][8] · 12.08±0.59[10] · 12.1[1][3] · 12.20[7]

2429 Schürer, provisional designation 1977 TZ, is a stony asteroid from the middle region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 12 October 1977.[11]

The Collaborative Asteroid Lightcurve Link (CALL) classifies the asteroid as a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. However, based on its concurring orbital elements, Alvarez-Candal from the Universidad Nacional de Córdoba, groups the asteroid into the Maria family, which is named after 170 Maria (also see 9175 Graun).[4]:389

It orbits the Sun at a distance of 2.3–2.8 AU once every 4 years and 2 months (1,507 days). Its orbit has an eccentricity of 0.10 and an inclination of 15° with respect to the ecliptic.[1] The body's rotation period has been determined by three different photometric light-curve observations, that gave a period between 6.7 and 7.5 hours.[a][4][9] The asteroid's albedo amounts to 0.10–0.20, according to the surveys carried out by the Japanese Akari satellite (0.10) and the Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission (0.12 and 0.20), while CALL assumes an albedo of 0.21, which results in the lowest of all estimated diameters for the body (12.1 km).[3][5][6][7][8]

The minor planet was named in honor of Swiss astronomer Max Schürer (1910–1997), who was director of the Astronomical Institute of the University of Bern from 1947 to 1980. Due to his initiative, endurance, and great technical competence, the discovering observatory at Zimmerwald – after which the asteroid 1775 Zimmerwald is named – could be built in 1956. He did a lot of orbit computation on asteroids when he was a pupil of astronomer Sigmund Mauderli (1876–1962), who was the preceding director of the Astronomical Institute (also see 1748 Mauderli). Schürer also dealt with stellar dynamics and was deeply involved as a pioneer in satellite geodesy.[2] Naming citation was published on 10 November 1992 (M.P.C. 21129).[12]


  1. ^ a b Seifert (2011) web: rotation period 7.45±0.01 hours with a brightness amplitude of 0.12 mag. Summary figures at www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=2429%7CSchurer
  1. ^ a b c d "JPL Small-Body Database Browser: 2429 Schurer (1977 TZ)" (2016-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 7 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2429) Schürer. Springer Berlin Heidelberg. p. 198. ISBN 978-3-540-00238-3. Retrieved 7 December 2016. 
  3. ^ a b c d e f "LCDB Data for (2429) Schürer". Asteroid Lightcurve Database (LCDB). Retrieved 7 December 2016. 
  4. ^ a b c d Alvarez-Candal, Alvaro; Duffard, René; Angeli, Cláudia A.; Lazzaro, Daniela; Fernández, Silvia (December 2004). "Rotational lightcurves of asteroids belonging to families". Icarus. 172 (2): 388–401. Bibcode:2004Icar..172..388A. doi:10.1016/j.icarus.2004.06.008. Retrieved 7 December 2016. 
  5. ^ 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 7 December 2016. 
  6. ^ 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 7 December 2016. 
  7. ^ 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 7 December 2016. 
  8. ^ 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 7 December 2016. 
  9. ^ a b Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; Brosch, N.; Kaplan, M.; et al. (March 2014). "Rotational Properties of the Maria Asteroid Family". The Astronomical Journal. 147 (3): 15. Bibcode:2014AJ....147...56K. doi:10.1088/0004-6256/147/3/56. Retrieved 7 December 2016. 
  10. ^ 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 7 December 2016. 
  11. ^ "2429 Schurer (1977 TZ)". Minor Planet Center. Retrieved 7 December 2016. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 December 2016. 

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