1726 Hoffmeister

1726 Hoffmeister
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 24 July 1933
Designations
MPC designation 1726 Hoffmeister
Named after
 Cuno Hoffmeister
(astronomer) [2]
1933 OE · 1955 FC
1955 HX · 1957 WD
A924 UA
main-belt · (outer) [3]
Hoffmeister family [4]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 91.81 yr (33,532 days)
Aphelion 2.9037 AU
Perihelion 2.6703 AU
2.7870 AU
Eccentricity 0.0419
4.65 yr (1,699 days)
317.47°
0° 12m 42.48s / day
Inclination 3.4834°
230.97°
68.879°
Physical characteristics
Dimensions 17.35 km (calculated)[3]
22.52±0.23 km[5]
25.250±0.079 km[6]
25.438±0.118 km[7]
11.7058±0.0056 h[8]
0.0360±0.0066[7]
0.037±0.005[6]
0.042±0.006[5]
0.057 (assumed)[3]
SMASS = Cb [1] · C [9]
12.082±0.002 (R)[8]
12.2[7]
12.3[1][5]
12.53[3]
12.54±0.24[9]

    1726 Hoffmeister, provisional designation 1933 OE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 23 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 24 July 1933.[10]

    The dark C-type asteroid has a Cb-subtype in the SMASS taxonomy. It is the lowest-numbered and probably the largest member of the small and very compact dynamical Hoffmeister family, 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.[4] It orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,699 days). Its orbit has an eccentricity of 0.04 and an inclination of 3° with respect to the ecliptic.[1] The was first identified as "1924 UA" at the U.S. Yerkes Observatory in 1924, extending the asteroid's observation arc by 9 years prior to its discovery.[10]

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 22.5 and 25.4 kilometers in diameter and its surface has a low albedo between 0.036 and 0.042,[5][6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 17.4 kilometers, based on an absolute magnitude of 12.53.[3]

    In December 2009, a rotational light-curve was obtained for this asteroid from photometric observations 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).[8]

    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-discovererd comet C/1959 O1, thoroughly investigated a large number of meteors, and discovererd 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] Naming citation was published before November 1977 (M.P.C. 3933).[11]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 1726 Hoffmeister (1933 OE)" (2016-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 28 October 2016.
    2. 1 2 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. 1 2 3 4 5 "LCDB Data for (1726) Hoffmeister". Asteroid Lightcurve Database (LCDB). Retrieved 28 October 2016.
    4. 1 2 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.
    5. 1 2 3 4 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.
    6. 1 2 3 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.
    7. 1 2 3 4 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.
    8. 1 2 3 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.
    9. 1 2 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.
    10. 1 2 "1726 Hoffmeister (1933 OE)". Minor Planet Center. Retrieved 28 October 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 October 2016.

    External links

    This article is issued from Wikipedia - version of the 10/28/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.