1726 Hoffmeister

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1726 Hoffmeister
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date24 July 1933
Designations
(1726) Hoffmeister
Named after
 Cuno Hoffmeister
(German astronomer) [2]
1933 OE ·1955 FC
1955 HX ·1957 WD
A924 UA
main-belt  ·(middle)
Hoffmeister [3] [4]
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)
42.063°
0° 12m 42.48s / day
Inclination 3.4833°
230.97°
69.026°
Physical characteristics
Dimensions17.35 km (calculated) [5]
22.03±5.39 [6]
22.52±0.23 km [7]
24.61±0.52 [8]
25.250±0.079 km [9]
25.438±0.118 km [10]
25.67±8.37 [11]
11.7058±0.0056 h [12]
0.03±0.03 [11]
0.0360±0.0066 [10]
0.037±0.005 [9]
0.042±0.006 [7]
0.044±0.002 [8]
0.05±0.05 [6]
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.

    Contents

    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

    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

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

    Diameter and albedo

    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

    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]

    Naming

    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 by the Minor Planet Center on 20 February 1976 ( M.P.C. 3933). [15]

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    <span class="mw-page-title-main">1039 Sonneberga</span> Asteroid

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    6433 Enya, provisional designation 1978 WC, is a stony background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 18 November 1978, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic. It was named for Irish musician Enya.

    <span class="mw-page-title-main">1132 Hollandia</span> Asteroid

    1132 Hollandia, provisional designation 1929 RB1, is a stony asteroid from the middle region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 13 September 1929, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named for the region Holland in the Netherlands.

    1159 Granada, provisional designation 1929 RD, is a dark background asteroid and relatively slow rotator from the inner regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 2 September 1929, by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The asteroid was named for the Spanish city and province of Granada.

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    References

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    2. 1 2 Schmadel, Lutz D. (2007). "(1726) Hoffmeister". Dictionary of Minor Planet Names – (1726) Hoffmeister. Springer Berlin Heidelberg. p. 137. doi:10.1007/978-3-540-29925-7_1727. ISBN   978-3-540-00238-3.
    3. 1 2 Migliorini, F.; Manara, A.; di Martino, M.; Farinella, P. (June 1996). "The Hoffmeister asteroid family: inferences from physical data". Astronomy and Astrophysics. 310: 681–685. Bibcode:1996A&A...310..681M . Retrieved 17 November 2015.
    4. 1 2 Carruba, V.; Novakovic, B.; Aljbaae, S. (March 2017). "The Hoffmeister asteroid family". Monthly Notices of the Royal Astronomical Society. 465 (4): 4099–4105. arXiv: 1611.06176 . Bibcode:2017MNRAS.465.4099C. doi:10.1093/mnras/stw3022.
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    15. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN   978-3-642-01964-7.
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