2029 Binomi

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2029 Binomi
Discovery [1]
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date11 September 1969
MPC designation(2029) Binomi
Named after
Alessandro Binomi
(fictitious mathematician)[2]
1969 RB · 1971 BX2
1976 QV1
main-belt · Vesta[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc47.52 yr (17,355 days)
Aphelion2.6515 AU
Perihelion2.0477 AU
2.3496 AU
3.60 yr (1,316 days)
0° 16m 25.32s / day
Physical characteristics
Dimensions5.39 km (calculated)[3]
6.893±0.164 km[4]
7.050±0.058 km[5]
3.7555±0.010 h[6]
3.756±0.0015 h[7]
0.24 (assumed)[3]
SMASS = S[1][3]
12.9[5] · 13.0[1] · 13.030±0.210 (R)[6] · 13.058±0.001 (R)[7] · 13.24±0.26[8] · 13.51[3]

2029 Binomi, provisional designation 1969 RB, is a Vestian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter.

The asteroid was discovered on 11 September 1969, by Paul Wild at Zimmerwald Observatory near Bern, Switzerland.[9] It was named for the fictitious mathematician "Alessandro Binomi" who invented the binomial formula.[2]

Classification and orbit[edit]

Binomi is a member of the Vesta family, one of the largest collisional populations of the inner asteroid belt. It orbits the Sun at a distance of 2.0–2.7 AU once every 3 years and 7 months (1,316 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.[1]

The body's observation arc begins at Crimea–Nauchnij on 10 September 1969, the night before its official discovery observation at Zimmerwald.[9]

Physical characteristics[edit]

In the SMASS classification, Binomi is a stony S-type asteroid.[1]


In January 2014, two rotational lightcurves of Binomi were obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 3.7555 and 3.756 hours with a brightness variation of 0.51 and 0.52 magnitude, respectively (U=2/2).[6][7]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Binomi measures 6.893 and 7.050 kilometers in diameter and its surface has an albedo of 0.2468 and 0.257, respectively.[4][5]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 5.39 kilometers based on an absolute magnitude of 13.51.[3]


This minor planet was named for the fictitious mathematician "Alessandro Binomi", inventor of the binomial formula. This act of parody science was common among students at German-speaking universities (de:Binomi). The real inventors of the binomial formula are the Bernoullis, after whom the asteroid 2034 Bernoulli was named.[2] The approved naming citation was published by the Minor Planet Center on 1 August 1981 (M.P.C. 6208).[10]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2029 Binomi (1969 RB)" (2017-03-17 last obs.). Jet Propulsion Laboratory. Retrieved 28 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2029) Binomi". Dictionary of Minor Planet Names – (2029) Binomi. Springer Berlin Heidelberg. p. 164. doi:10.1007/978-3-540-29925-7_2030. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (2029) Binomi". Asteroid Lightcurve Database (LCDB). Retrieved 28 June 2017.
  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 28 June 2017.
  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.
  6. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 28 June 2017.
  7. ^ 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:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 28 June 2017.
  8. ^ 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 28 June 2017.
  9. ^ a b "2029 Binomi (1969 RB)". Minor Planet Center. Retrieved 28 June 2017.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 June 2017.

External links[edit]