1823 Gliese, provisional designation 1951 RD, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 4 September 1951, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[8] The asteroid was named after German astronomer Wilhelm Gliese.[2]

1823 Gliese
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date4 September 1951
MPC designation(1823) Gliese
Named after
Wilhelm Gliese
(German astronomer)[2]
1951 RD · 1944 MC
1948 VH · 1950 BL
1950 DR · 1950 EF
1954 NE · 1970 EU2
1971 SE1
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc68.36 yr (24,967 days)
Aphelion2.5268 AU
Perihelion1.9244 AU
2.2256 AU
3.32 yr (1,213 days)
0° 17m 48.48s / day
Physical characteristics
Dimensions8.19 km (calculated)[3]
9.544±0.025 km[5]
4.4864±0.0006 h[a]
4.488±0.003 h[6]
0.24 (assumed)[3]
12.55±0.49[7] · 12.6[1][3] · 12.9[5]

Orbit and classificationEdit

The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,213 days). Its orbit has an eccentricity of 0.14 and an inclination of 3° with respect to the ecliptic.[1] The first unused observations date back to 1944 at Johannesburg Observatory, when it was identified as 1944 MC. The first used precovery was taken at the discovering Heidelberg observatory in 1950, extending the asteroid's observation arc by one year prior to its official discovery.[8]

Physical characteristicsEdit

Rotation periodEdit

A rotational lightcurve of this asteroid was obtained from photometric observations made by Czech astronomer Petr Pravec at the Ondřejov Observatory in August 2014. The lightcurve gave a well-defined rotation period of 4.4864±0.0006 hours with a brightness variation of 0.27 in magnitude (U=3).[a] One month later, in September 2014, a second lightcurve by American astronomer Brian Warner at his Palmer Divide Observatory, Colorado, gave a concurring period of 4.488±0.003 hours with an amplitude of 0.23 in magnitude (U=3).[6]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 8.4 and 9.5 kilometers in diameter and its surface has an albedo of 0.189 and 0.135, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this asteroid's orbital family – and calculates a diameter of 8.2 kilometers with an absolute magnitude of 12.6.[3]


This minor planet was named after German astronomer Wilhelm Gliese (1915–1993) at the Astronomisches Rechen-Institut. Gliese is widely known for having compiled about 1,000 stars located within 25 parsecs of Earth into the Gliese Catalogue of Nearby Stars.[2] The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4156).[9] A large number of Exoplanets derive their names form this star catalogue.


  1. ^ a b Pravec, P.; Wolf, M.; Sarounova, L. (2014) web publication. Summary figures listed at the Light Curve Data Base – (1823) Gliese


  1. ^ a b c d "JPL Small-Body Database Browser: 1823 Gliese (1951 RD)" (2017-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1823) Gliese". Dictionary of Minor Planet Names – (1823) Gliese. Springer Berlin Heidelberg. p. 146. doi:10.1007/978-3-540-29925-7_1824. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1823) Gliese". Asteroid Lightcurve Database (LCDB). Retrieved 16 May 2016.
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 8 December 2016.
  5. ^ 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. Retrieved 16 May 2016.
  6. ^ a b Warner, Brian D. (January 2015). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October". The Minor Planet Bulletin. 42 (1): 54–60. Bibcode:2015MPBu...42...54W. ISSN 1052-8091. Retrieved 4 November 2015.
  7. ^ 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 16 May 2016.
  8. ^ a b "1823 Gliese (1951 RD)". Minor Planet Center. Retrieved 16 May 2016.
  9. ^ 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