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1516 Henry, provisional designation 1938 BG, is a stony asteroid from the middle region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 28 January 1938, by French astronomer André Patry at Nice Observatory in southeastern France.[13] It is named for French astronomers and opticians, Paul and Prosper Henry.[2]

1516 Henry
Discovery [1]
Discovered byA. Patry
Discovery siteNice Obs.
Discovery date28 January 1938
MPC designation(1516) Henry
Named after
Paul and Prosper Henry (astronomers, opticians)[2]
1938 BG · 1938 DM
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc79.00 yr (28,854 days)
Aphelion3.1087 AU
Perihelion2.1368 AU
2.6227 AU
4.25 yr (1,551 days)
0° 13m 55.2s / day
Physical characteristics
Dimensions19.19±4.31 km[4]
19.92±1.7 km[5]
19.98 km (derived)[3]
26.163±0.138 km[6]
26.442±0.150 km[7]
27.70±8.84 km[8]
28.55±0.36 km[9]
10 h[10]
17.370±0.006 h[11]
0.0701 (derived)[3]
11.33±1.36[12] · 11.8[7][9] · 11.90[8] · 11.95[4] · 12.0[1][3] · 12.30[5]

Orbit and classificationEdit

The S-type asteroid orbits the Sun in the central main-belt at a distance of 2.1–3.1 AU once every 4 years and 3 months (1,551 days). Its orbit has an eccentricity of 0.19 and an inclination of 9° with respect to the ecliptic.[1] No precoveries were taken, and no prior identifications were made. Henry's observation arc starts at Nice in August 1939, or 19 months after its official discovery observation.[13]

Physical characteristicsEdit

In May 2005, a rotational lightcurve of Henry was obtained by French amateur astronomer Christophe Demeautis. It gave a rotation period of 17.370 hours with a brightness variation of 0.54 magnitude (U=2).[11] In February 2010, photometric observations by David Polishook and others at the Californian Palomar Transient Factory gave a divergent period of 10 hours with an amplitude of only 0.04 (U=2).[10]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Henry measures between 19.19 and 28.55 kilometers in diameter, and its surface has an albedo between 0.039 and 0.070.[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0701 and a diameter of 19.98 kilometers with an absolute magnitude of 12.0.[3]


This minor planet is named for the two brothers Paul Henry and Prosper Henry (1848–1905 and 1849–1903, respectively), who each discovered seven asteroids. As opticians, they constructed the 76-cm refracting telescope at Nice Observatory, among others. While mapping the ecliptic during their Carte du Ciel survey, they made all their fourteen, low-numbered asteroid discoveries, starting with 125 Liberatrix.

The Henry Brothers are also honored by the lunar crater Henry Frères. The Martian crater Henry was named in honour of Paul.[2] The official naming citation was published by the Minor Planet Center on 1 April 1978 (M.P.C. 4358).[14]


  1. ^ a b c d "JPL Small-Body Database Browser: 1516 Henry (1938 BG)" (2017-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1516) Henry". Dictionary of Minor Planet Names – (1516) Henry. Springer Berlin Heidelberg. p. 120. doi:10.1007/978-3-540-29925-7_1517. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1516) Henry". Asteroid Lightcurve Database (LCDB). Retrieved 3 January 2017.
  4. ^ 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. Retrieved 3 January 2017.
  5. ^ a b c d 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 3 January 2017.
  6. ^ 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 3 January 2017.
  7. ^ 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.
  8. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 3 January 2017.
  9. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 3 January 2017.
  10. ^ a b Polishook, D.; Ofek, E. O.; Waszczak, A.; Kulkarni, S. R.; Gal-Yam, A.; Aharonson, O.; et al. (April 2012). "Asteroid rotation periods from the Palomar Transient Factory survey". Monthly Notices of the Royal Astronomical Society. 421 (3): 2094–2108. arXiv:1201.1930. Bibcode:2012MNRAS.421.2094P. doi:10.1111/j.1365-2966.2012.20462.x. Retrieved 3 January 2017.
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1516) Henry". Geneva Observatory. Retrieved 3 January 2017.
  12. ^ 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 3 January 2017.
  13. ^ a b "1516 Henry (1938 BG)". Minor Planet Center. Retrieved 3 January 2017.
  14. ^ 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 linksEdit