1575 Winifred

1575 Winifred
Discovery [1]
Discovered by R. C. Cameron of Indiana University
Discovery site Goethe Link Obs.
Discovery date 20 April 1950
Designations
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)
356.93°
0° 16m 9.84s / day
Inclination 24.825°
206.84°
348.33°
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]
0.2452±0.064[4]
0.2388±0.0311[5]
0.247±0.034[6]
0.3134 (derived)[3]
S [3]
12.0[1][3][6]
12.3[5]
11.36±1.19[9]

    1575 Winifred, provisional designation 1950 HH, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, about 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]

    In 2009, a photometric light-curve analysis by Brian Warner at the U.S. Palmer Divide Observatory, Colorado, 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] An alternative light-curve observation published by Behrend in 2005, gave a similar, yet less accurate rotation period of 129 hours, with a smaller amplitude of 0.51 in magnitude.[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 (CALL) 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]

    See also

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 1575 Winifred (1950 HH)" (2016-02-19 last obs.). Jet Propulsion Laboratory. Retrieved February 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1575) Winifred. Springer Berlin Heidelberg. p. 125. ISBN 978-3-540-00238-3. Retrieved February 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (1575) Winifred". Asteroid Lightcurve Database (LCDB). Retrieved February 2016.
    4. 1 2 3 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 February 2016.
    5. 1 2 3 4 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved February 2016.
    6. 1 2 3 4 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 February 2016.
    7. 1 2 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 February 2016.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1575) Winifred". Geneva Observatory. Retrieved February 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved February 2016.
    10. ↑ "1575 Winifred (1950 HH)". Minor Planet Center. Retrieved February 2016.

    External links


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