1665 Gaby

1665 Gaby
	Shape model of Gaby from its lightcurve
Discovery
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	27 February 1930
Designations
MPC designation	(1665) Gaby
Named after	Gaby Reinmuth; (daughter-in-law of); Karl Reinmuth
Alternative designations	1930 DQ · 1941 BC; 1949 HS · 1951 WQ; 1957 KF
Minor planet category	main-belt · (inner)
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	87.04 yr (31,793 days)
Aphelion	2.9145 AU
Perihelion	1.9128 AU
Semi-major axis	2.4136 AU
Eccentricity	0.2075
Orbital period (sidereal)	3.75 yr (1,370 days)
Mean anomaly	165.86°
Mean motion	0° 15m 46.08s / day
Inclination	10.835°
Longitude of ascending node	91.543°
Argument of perihelion	5.9166°
Physical characteristics
Dimensions	10.746±0.179 km; 10.960±0.021 km; 11.009 km; 11.01 km (taken)
Synodic rotation period	66±2 h; 67.905±0.005 h; 67.911±0.005 h
Geometric albedo	0.2532; 0.2681±0.0736; 0.278±0.049
Spectral type	Tholen = S · S; B–V = 0.848; U–B = 0.481
Absolute magnitude (H)	11.85 · 11.9±0.2 · 12.19±0.97

1665 Gaby, provisional designation 1930 DQ, is a stony asteroid and a relatively slow rotator from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 27 February 1930, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.^[12] It was later named after Gaby Reinmuth, the discoverer's daughter-in-law.^[2]

Orbit and classification

Gaby orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 9 months (1,370 days). Its orbit has an eccentricity of 0.21 and an inclination of 11° with respect to the ecliptic.^[1] No precoveries were taken, and no prior identifications were made of Gaby. The body's observation arc begins 2 months after its official discovery observation at Heidelberg.^[12]

Physical characteristics

In the Tholen classification, Gaby is a common S-type asteroid.^[1]

Lightcurves

In February 2005, French amateur astronomer Laurent Bernasconi obtained a rotational lightcurve of Gaby from photometric observations. It gave a rotation period of 66 hours with a brightness variation of 0.27 magnitude (U=2).^[7]

This is a longer-than average rotation, since most minor planets have a period between 2 and 20 hours (see list). In 2016, concurring sidereal periods of 67.905 and 67.911 hours were obtained from modeled photometric observations derived from the Lowell Photometric Database and other sources (U=n.a.).^[8]^[9]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Gaby measures between 10.75 and 11.01 kilometers in diameter, and its surface has an albedo between 0.253 and 0.278.^[4]^[5]^[6] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data with an albedo of 0.2532 and a diameter of 11.01 kilometers using an absolute magnitude of 11.9±0.2.^[3]^[6]

Naming

This minor planet was named by the discoverer for his daughter-in-law, Gaby Reinmuth.^[2] The official naming citation was published by the Minor Planet Center on 15 December 1968 (M.P.C. 2901).^[13]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h "JPL Small-Body Database Browser: 1665 Gaby (1930 DQ)" (2017-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
^ ^a ^b ^c Schmadel, Lutz D. (2007). "(1665) Gaby". Dictionary of Minor Planet Names – (1665) Gaby. Springer Berlin Heidelberg. p. 132. doi:10.1007/978-3-540-29925-7_1666. ISBN 978-3-540-00238-3.
^ ^a ^b ^c ^d ^e "LCDB Data for (1665) Gaby". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
^ ^a ^b ^c 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 23 December 2016.
^ ^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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
^ ^a ^b ^c ^d ^e Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 23 December 2016.
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1665) Gaby". Geneva Observatory. Retrieved 23 December 2016.
^ ^a ^b Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 23 December 2016.
^ ^a ^b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
^ ^a ^b 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 23 December 2016.
^ Harris, A. W.; Young, J. W.; Dockweiler, Thor; Gibson, J.; Poutanen, M.; Bowell, E. (January 1992). "Asteroid lightcurve observations from 1981". Icarus. 95 (1): 115–147.ResearchsupportedbyLowellObservatoryEndowmentandNASA. Bibcode:1992Icar...95..115H. doi:10.1016/0019-1035(92)90195-D. ISSN 0019-1035. Retrieved 23 December 2016.
^ ^a ^b "1665 Gaby (1930 DQ)". Minor Planet Center. Retrieved 23 December 2016.
^ 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.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
1665 Gaby at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1665 Gaby at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[jpldata-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h "JPL Small-Body Database Browser: 1665 Gaby (1930 DQ)" (2017-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.

[springer-2] Schmadel, Lutz D. (2007). "(1665) Gaby". Dictionary of Minor Planet Names – (1665) Gaby. Springer Berlin Heidelberg. p. 132. doi:10.1007/978-3-540-29925-7_1666. ISBN 978-3-540-00238-3.

[lcdb-3] "LCDB Data for (1665) Gaby". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.

[Masiero-2011-4] 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 23 December 2016.

[WISE-5] 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.

[Pravec-2012b-6] Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 23 December 2016.

[geneva-obs-7] Behrend, Raoul. "Asteroids and comets rotation curves – (1665) Gaby". Geneva Observatory. Retrieved 23 December 2016.

[Hanus-2011-8] Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 23 December 2016.

[Hanus-2016a-9] Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.

[Veres-2015-10] 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 23 December 2016.

[Harris-1992-11] Harris, A. W.; Young, J. W.; Dockweiler, Thor; Gibson, J.; Poutanen, M.; Bowell, E. (January 1992). "Asteroid lightcurve observations from 1981". Icarus. 95 (1): 115–147.ResearchsupportedbyLowellObservatoryEndowmentandNASA. Bibcode:1992Icar...95..115H. doi:10.1016/0019-1035(92)90195-D. ISSN 0019-1035. Retrieved 23 December 2016.

[MPC-Gaby-12] "1665 Gaby (1930 DQ)". Minor Planet Center. Retrieved 23 December 2016.

[DoMP-Circular-dates-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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