3267 Glo

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]

3267 Glo
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date3 January 1981
Designations
(3267) Glo
Named after
Eleanor F. Helin
(American astronomer)[2]
1981 AA
Mars-crosser [1][3]
Phocaea [4][5]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc36.49 yr (13,329 d)
Aphelion3.0178 AU
Perihelion1.6424 AU
2.3301 AU
Eccentricity0.2951
3.56 yr (1,299 d)
196.67°
0° 16m 37.56s / day
Inclination24.021°
110.47°
307.73°
Physical characteristics
Mean diameter
6.45±1.44 km[6]
7.58±0.76 km[7]
13.56±1.1 km[8]
13.59 km (derived)[4]
6.8782±0.0011 h[4][lower-alpha 1]
0.0607±0.011[8]
0.0725 (derived)[4]
0.233±0.047[7]
0.26±0.12[6]
LS [9] · S (derived)[4]
12.8[3][4][7] · 12.86±0.14[9]
13.19[6]

    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][lower-alpha 1]

    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
    1. 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
    1. "3267 Glo (1981 AA)". Minor Planet Center. Retrieved 14 April 2018.
    2. 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.
    3. "JPL Small-Body Database Browser: 3267 Glo (1981 AA)" (2017-07-02 last obs.). Jet Propulsion Laboratory. Retrieved 14 April 2018.
    4. "LCDB Data for (3267) Glo". Asteroid Lightcurve Database (LCDB). Retrieved 9 March 2017.
    5. "Asteroid 3267 Glo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    6. 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.
    7. 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.
    8. 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.
    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.
    10. "JPL Small-Body Database Search Engine: "spectral type = L (SMASSII)"". JPL Solar System Dynamics. Retrieved 28 April 2017.
    11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 March 2017.

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