1726 Hoffmeister

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1726 Hoffmeister
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 24 July 1933
MPC designation (1726) Hoffmeister
Named after
Cuno Hoffmeister
(German astronomer)[2]
1933 OE · 1955 FC
1955 HX · 1957 WD
A924 UA
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 91.85 yr (33,547 days)
Aphelion 2.9051 AU
Perihelion 2.6702 AU
2.7877 AU
Eccentricity 0.0421
4.65 yr (1,700 days)
0° 12m 42.48s / day
Inclination 3.4833°
Physical characteristics
Dimensions 17.35 km (calculated)[5]
22.52±0.23 km[7]
25.250±0.079 km[9]
25.438±0.118 km[10]
11.7058±0.0056 h[12]
0.057 (assumed)[5]
SMASS = Cb [1] · C[5][13]
12.082±0.002 (R)[12] · 12.10[8] · 12.26[11] · 12.2[10] · 12.3[1][6][7] · 12.53[5] · 12.54±0.24[13]

1726 Hoffmeister, provisional designation 1933 OE, is a carbonaceous asteroid and namesake of the Hoffmeister family from the central region of the asteroid belt, approximately 23 kilometers in diameter.

It was discovered on 24 July 1933, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany, and named after astronomer Cuno Hoffmeister.[14]

Orbit and classification[edit]

Hoffmeister is the namesake and lowest-numbered member of the very compact Hoffmeister family (519), which, based upon its low albedo, was most likely formed from the breakup of a 50–100 kilometer-sized, carbon-rich parent body within the past several hundred million years.[3][4]

It orbits the Sun in the central main-belt at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,700 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.04 and an inclination of 3° with respect to the ecliptic.[1] It was first identified as 1924 UA at the Yerkes Observatory in 1924, extending the asteroid's observation arc by 9 years prior to its official discovery observation at Heidelberg.[14]

Physical characteristics[edit]

In the SMASS classification, Hoffmeister is characterized as a Cb-type, a subtype of the carbonaceous C-complex.[1][13]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Hoffmeister measures between 22.03 and 25.67 kilometers in diameter, and its surface has a low albedo between 0.03 and 0.05.[6][7][8][9][10][11] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 17.4 kilometers with an absolute magnitude of 12.53.[5]

Rotational lightcurve[edit]

In December 2009, a rotational lightcurve of Hoffmeister was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. It gave a rotation period of 11.7058±0.0056 hours with a brightness variation of 0.40 magnitude (U=2).[12]


This minor planet was named in memory of German astronomer Cuno Hoffmeister (1892–1968), who founded the Sonneberg Observatory in 1925, and became one of its directors (see 1039 Sonneberga). Hoffmeister discovered thousands of variable stars, co-discovered comet C/1959 O1, thoroughly investigated a large number of meteors, and discovered 5 minor planets: 2183 Neufang, 3203 Huth, 3674 Erbisbühl, 4183 Cuno (which was later named after him) and 4724 Brocken. The lunar crater Hoffmeister was also named in his honor.[2] The official naming citation was published before November 1977 (M.P.C. 3933).[15]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1726 Hoffmeister (1933 OE)" (2016-08-27 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1726) Hoffmeister. Springer Berlin Heidelberg. p. 137. ISBN 978-3-540-00238-3. Retrieved 28 October 2016. 
  3. ^ a b Migliorini, F.; Manara, A.; di Martino, M.; Farinella, P. (June 1996). "The Hoffmeister asteroid family: inferences from physical data". Astronomy and Astrophysics. Bibcode:1996A&A...310..681M. Retrieved 17 November 2015. 
  4. ^ a b Carruba, V.; Novakovic, B.; Aljbaae, S. (March 2017). "The Hoffmeister asteroid family" (PDF). Monthly Notices of the Royal Astronomical Society. 465 (4): 4099–4105. arXiv:1611.06176Freely accessible. Bibcode:2017MNRAS.465.4099C. doi:10.1093/mnras/stw3022. Retrieved 19 April 2017. 
  5. ^ a b c d e "LCDB Data for (1726) Hoffmeister". Asteroid Lightcurve Database (LCDB). Retrieved 28 October 2016. 
  6. ^ 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 19 April 2017. 
  7. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 28 October 2016. 
  8. ^ 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 19 April 2017. 
  9. ^ 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 28 October 2016. 
  10. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 28 October 2016. 
  11. ^ 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 19 April 2017. 
  12. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 28 October 2016. 
  13. ^ a b c 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 28 October 2016. 
  14. ^ a b "1726 Hoffmeister (1933 OE)". Minor Planet Center. Retrieved 28 October 2016. 
  15. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 October 2016. 

External links[edit]