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3267 Glo, provisional designation 1981 AA, is an eccentric Phocaean asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 10 kilometers (6 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
MPC designation(3267) Glo
Named after
Eleanor F. Helin
(American astronomer)[2]
1981 AA
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
3.56 yr (1,299 d)
0° 16m 37.56s / day
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][a]
0.0725 (derived)[4]
LS[9] · S (derived)[4]
12.8[3][4][7] · 12.86±0.14[9]

Orbit and classificationEdit

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 characteristicsEdit

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

Spectral typeEdit

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 periodEdit

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 albedoEdit

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]


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]


  1. ^ 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.


  1. ^ a b c d "3267 Glo (1981 AA)". Minor Planet Center. Retrieved 14 April 2018.
  2. ^ 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.
  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.
  4. ^ a b c d e f g h "LCDB Data for (3267) Glo". Asteroid Lightcurve Database (LCDB). Retrieved 9 March 2017.
  5. ^ a b "Asteroid 3267 Glo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ a b c d 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.

External linksEdit