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3267 Glo
Discovery
Discovered by	E. Bowell
Discovery site	Anderson Mesa Stn.
Discovery date	3 January 1981
Designations
MPC designation	(3267) Glo
Named after	Eleanor F. Helin; (American astronomer)
Alternative designations	1981 AA
Minor planet category	Mars-crosser; Phocaea
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	36.49 yr (13,329 d)
Aphelion	3.0178 AU
Perihelion	1.6424 AU
Semi-major axis	2.3301 AU
Eccentricity	0.2951
Orbital period (sidereal)	3.56 yr (1,299 d)
Mean anomaly	196.67°
Mean motion	0° 16m 37.56s / day
Inclination	24.021°
Longitude of ascending node	110.47°
Argument of perihelion	307.73°
Physical characteristics
Mean diameter	6.45±1.44 km; 7.58±0.76 km; 13.56±1.1 km; 13.59 km (derived)
Synodic rotation period	6.8782±0.0011 h
Geometric albedo	0.0607±0.011; 0.0725 (derived); 0.233±0.047; 0.26±0.12
Spectral type	LS · S (derived)
Absolute magnitude (H)	12.8 · 12.86±0.14; 13.19

3267 Glo, provisional designation 1981 AA, is an eccentric Phocaean asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 6.4 kilometers (4.0 miles) in diameter. It was discovered on 3 January 1981, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Flagstaff, Arizona.^[1] It was later named after American astronomer Eleanor Helin.^[2]

Orbit and classification

Glo is an eccentric member of the Phocaea family (701),^[5] that orbits the Sun in the inner asteroid belt at a distance of 1.6–3.0 AU once every 3 years and 7 months (1,299 days; semi-major axis of 2.33 AU). Its orbit has an eccentricity of 0.30 and an inclination of 24° with respect to the ecliptic.^[3]

The body's observation arc begins with its official discovery observation at Anderson Mesa in January 1981.^[1]

Physical characteristics

The asteroid has been characterized as an L- and S-type asteroid by Pan-STARRS large-scale survey.^[9]

Spectral type

PanSTARRS' photometric survey, has characterized Glo as a LS-type asteroid, a transitional spectral type between the common S-type and rather rare L-type asteroids,^[9] which have very different albedos, from as low as 0.039 to as high as 0.383.^[10]

Rotation period

A rotational lightcurve of Glo was obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory in January 2006. Lightcurve analysis gave a well-defined rotation period of 6.8782 hours with a brightness variation of 0.33 magnitude (U=3).^[4]

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, Glo measures 6.45 and 13.56 kilometers in diameter and its surface has an albedo of 0.061 and 0.26, respectively.^[6]^[8] The Collaborative Asteroid Lightcurve Link agrees with IRAS and derives a similar albedo of 0.0725 and a diameter of 13.59 kilometers with an absolute magnitude of 12.8.^[4]^[a]

Naming

This minor planet was named in honor of Eleanor "Glo" Helin (1932–2009), who was a planetary scientist at JPL and a prolific discoverer of minor planets.^[2] The official naming citation was published by the Minor Planet Center on 13 February 1987 (M.P.C. 11641).^[11]

Notes

^ ^a ^b Lightcurve plot of 3267 Glo giving a rotation period of 6.8782 hours with an amplitude of 0.0329 magnitude, taken from unpublished data of the Ondrejov Asteroid Photometry Project. Summary figures at the LCDB.

References

^ ^a ^b ^c ^d "3267 Glo (1981 AA)". Minor Planet Center. Retrieved 14 April 2018.
^ ^a ^b ^c Schmadel, Lutz D. (2007). "(3267) Glo". Dictionary of Minor Planet Names – (3267) Glo. Springer Berlin Heidelberg. p. 272. doi:10.1007/978-3-540-29925-7_3268. ISBN 978-3-540-00238-3.
^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 3267 Glo (1981 AA)" (2017-07-02 last obs.). Jet Propulsion Laboratory. Retrieved 14 April 2018.
^ ^a ^b ^c ^d ^e ^f ^g ^h "LCDB Data for (3267) Glo". Asteroid Lightcurve Database (LCDB). Retrieved 9 March 2017.
^ ^a ^b "Asteroid 3267 Glo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
^ ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
^ ^a ^b ^c Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics. 603: 8. arXiv:1705.10263. Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917. S2CID 119224590.
^ ^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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
^ ^a ^b ^c ^d Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2014). "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. S2CID 53493339.
^ "JPL Small-Body Database Search Engine: "spectral type = L (SMASSII)"". JPL Solar System Dynamics. Retrieved 28 April 2017.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 March 2017.