1575 Winifred

1575 Winifred, provisional designation 1950 HH, is a stony Phocaea asteroid and slow rotator from the inner regions of the asteroid belt, approximately 9.5 kilometers in diameter.

1575 Winifred
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date20 April 1950
Designations
(1575) Winifred
Named after
Winifred Sawtell
(staff member at USNO)[2]
1950 HH · 1928 HG
1939 GK · 1950 HD1
1977 UH1
main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc88.51 yr (32,327 days)
Aphelion2.7990 AU
Perihelion1.9497 AU
2.3743 AU
Eccentricity0.1789
3.66 yr (1,336 days)
158.55°
0° 16m 9.84s / day
Inclination24.827°
206.84°
348.40°
Physical characteristics
Dimensions9.31±1.0 km (IRAS)[5]
9.441±0.131 km[6]
9.45 km (derived)[3]
9.488±0.254[7]
10.66±0.43 km[8]
125±2 h[9]
129 h[10]
0.236±0.033[7]
0.2388±0.0311[6]
0.2452±0.064[5]
0.247±0.034[8]
0.3134 (derived)[3]
S [3]
11.36±1.19[11] · 12.0[1][3][8] · 12.3[6]

    It was discovered on 20 April 1950, by astronomer Robert Curry Cameron of Indiana University during the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States.[12] It was named after Winifred Cameron, an astronomer at the United States Naval Observatory.[2]

    Orbit and classification

    The stony S-type asteroid is a member of the Phocaea family (701), a group of asteroids with similar orbital characteristics, named after the family's namesake 25 Phocaea.[4] 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]

    Winifred was first identified as 1928 HG at Johannesburg Observatory in 1928, extending the body's observation arc by 22 years prior to its official discovery observation.[12]

    Physical characteristics

    Rotational lightcurve

    In July 2009, a rotational lightcurve was obtained for this asteroid from photometric observations taken by American astronomer Brian D. Warner at his Palmer Divide Observatory in Colorado. It gave a well-defined 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).[9] The result supersedes a previous observation by French astronomer Laurent Bernasconi from May 2005, that gave a similar, yet less accurate period of 129 hours, and with a smaller amplitude of 0.51 in magnitude (U=1).[10]

    Diameter and albedo

    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, Winifred has an albedo of 0.24 to 0.25 and a diameter between 9.3 and 10.7 kilometers,[5][6][7][8] while the Collaborative Asteroid Lightcurve Link derives a higher albedo of 0.31 and a diameter of 9.5 kilometers with an absolute magnitude of 12.0.[3]

    Naming

    This minor planet was named for a staff member of the United States Naval Observatory in Washington D.C., Winifred Sawtell Cameron. The official naming citation was proposed by the discovering astronomer and published by the Minor Planet Center in December 1952 (M.P.C. 844).[2][13]

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    References
    1. "JPL Small-Body Database Browser: 1575 Winifred (1950 HH)" (2016-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
    2. Schmadel, Lutz D. (2007). "(1575) Winifred". Dictionary of Minor Planet Names – (1575) Winifred. Springer Berlin Heidelberg. p. 125. doi:10.1007/978-3-540-29925-7_1576. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1575) Winifred". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
    4. "Asteroid 1575 Winifred – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
    6. 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 17 May 2016.
    7. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 8 December 2016.
    8. 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 17 May 2016.
    9. 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.
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1575) Winifred". Geneva Observatory. Retrieved 17 May 2016.
    11. 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 17 May 2016.
    12. "1575 Winifred (1950 HH)". Minor Planet Center. Retrieved 1 February 2016.
    13. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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