1575 Winifred

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1575 Winifred
Discovery [1]
Discovered by R. C. Cameron
(Indiana University)
Discovery site Goethe Link Obs.
Discovery date 20 April 1950
MPC designation 1575 Winifred
Named after
Winifred Sawtelle
(staff member at USNO)[2]
1950 HH · 1928 HG
1939 GK · 1950 HD1
1977 UH1
main-belt · Phocaea[3]
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 87.84 yr (32,083 days)
Aphelion 2.7996 AU
Perihelion 1.9488 AU
2.3742 AU
Eccentricity 0.1791
3.66 yr (1,336 days)
0° 16m 9.84s / day
Inclination 24.825°
Physical characteristics
Dimensions 9.3 km[1]
9.31±1.0 km (IRAS)[4]
9.441±0.131 km[5]
10.66±0.43 km[6]
9.45 km (derived)[3]
125±2 h[7]
129 h[8]
0.3134 (derived)[3]

1575 Winifred, provisional designation 1950 HH, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 20 April 1950, by astronomer R. C. Cameron of Indiana University at the U.S. Goethe Link Observatory, Indiana.[10]

The stony S-type asteroid is a member of the Phocaea family, a group of asteroids with similar orbital characteristics, named after the family's namesake 25 Phocaea. It orbits the Sun at a distance of 1.9–2.8 AU once every 3 years and 8 months (1,336 days). Its orbit has an eccentricity of 0.18 and an inclination of 25° with respect to the ecliptic.[1] The first precovery was taken at Johannesburg Observatory in 1928, extending the asteroid's observation arc by 22 years prior to its discovery.[10]

In July 2009, a rotational light-curve was obtained for this asteroid from photometric observations made by American astronomer Brian Warner at the U.S. Palmer Divide Observatory in Colorado. The well-defined light-curve rendered a long rotation period of 125±2 hours with an exceptionally high brightness amplitude of 1.20 in magnitude (U=3), and no sign of a non-principal axis rotation (NPAR).[7] The result superseded a previous observation by French astronomer Laurent Bernasconi in May 2005, that gave a similar, yet less accurate period of 129 hours, with a smaller amplitude of 0.51 in magnitude (U=1).[8]

According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has an albedo of 0.24 to 0.25 and a diameter between 9.3 and 10.7 kilometers,[4][5][6] while the Collaborative Asteroid Lightcurve Link derives a much higher albedo of 0.31 and a diameter of 9.5 kilometers.[3]

The minor planet was named for a staff member of the United States Naval Observatory in Washington D.C., Miss Winifred Sawtelle. The naming was proposed by the discovering astronomer.[2] Naming citation was published before November 1977 (M.P.C. 844).[11]

See also[edit]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1575 Winifred (1950 HH)" (2016-04-19 last obs.). Jet Propulsion Laboratory. Retrieved 17 May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1575) Winifred. Springer Berlin Heidelberg. p. 125. ISBN 978-3-540-00238-3. Retrieved 1 February 2016. 
  3. ^ a b c d e f "LCDB Data for (1575) Winifred". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016. 
  4. ^ a b c 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 17 May 2016. 
  5. ^ 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". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 17 May 2016. 
  6. ^ 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:1209.5794free to read. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 May 2016. 
  7. ^ a b Warner, Brian D. (January 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 June-September". The Minor Planet Bulletin. 37 (1): 24–27. Bibcode:2010MPBu...37...24W. ISSN 1052-8091. Retrieved 17 May 2016. 
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1575) Winifred". Geneva Observatory. Retrieved 17 May 2016. 
  9. ^ 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:1506.00762free to read. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 17 May 2016. 
  10. ^ a b "1575 Winifred (1950 HH)". Minor Planet Center. Retrieved 1 February 2016. 
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016. 

External links[edit]