1690 Mayrhofer

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1690 Mayrhofer
Discovery [1]
Discovered by M. Laugier
Discovery site Nice Obs.
Discovery date 8 November 1948
MPC designation (1690) Mayrhofer
Named after
Karl Mayrhofer
(amateur astronomer)[2]
1948 VB · 1932 WN
1953 VC2 · 1956 GN
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 84.11 yr (30,723 days)
Aphelion 3.3376 AU
Perihelion 2.7395 AU
3.0386 AU
Eccentricity 0.0984
5.30 yr (1,935 days)
0° 11m 9.96s / day
Inclination 13.049°
Physical characteristics
Dimensions 31.18±0.49 km[4]
31.198±7.539 km[5]
31.63 km (derived)[3]
31.71±2.0 km[6]
33.810±1.378 km[7]
19.0808±0.1110 h[8]
22.194±0.004 h[9]
0.0641 (derived)[3]
10.9[4][5][6] · 10.91±0.34[10] · 10.950±0.004 (R)[8] · 11.1[1][3][7]

1690 Mayrhofer, provisional designation 1948 VB, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 8 November 1948, by French astronomer Marguerite Laugier at Nice Observatory in south-east France.[11] It was later named after Austrian amateur astronomer Karl Mayrhofer.[2]

Orbit and classification[edit]

The C-type asteroid orbits the Sun in the outer main-belt at a distance of 2.7–3.3 AU once every 5 years and 4 months (1,935 days). Its orbit has an eccentricity of 0.10 and an inclination of 13° with respect to the ecliptic.[1] First identified as 1932 WN at Uccle, Mayrhofer's observation arc begins with its first used observation taken at Goethe Link Observatory in 1953, or 5 years after its official discovery observation at Nice.[11]

Physical characteristics[edit]

Rotation period[edit]

In November 2006, a rotational lightcurve of Mayrhofer was obtained from observations taken by French amateur astronomer Pierre Antonini, giving a rotation period of 22.194 hours with a brightness variation of 0.45 in magnitude (U=2).[9] Photometric observation in the R-band at the Palomar Transient Factory in November 2011, gave a shorter period of 19.0808 hours with an amplitude of 0.30 magnitude (U=2).[8]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Mayrhofer measures between 31.18 and 33.81 kilometers in diameter, and its surface has an albedo between 0.056 and 0.082.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.064 and a diameter of 31.63 kilometers based on an absolute magnitude of 11.1.[3]


Proposed by German catholic priest and amateur astronomer Otto Kippes, this minor planet was named after Austrian amateur astronomer Karl Mayrhofer (1903–1982). He lived in the Austrian town of Ried im Innkreis and was known for his calculations of orbital elements for asteroids.[2] Naming citation was published on 1 October 1980 (M.P.C. 5523).[12]


  1. ^ a b c d "JPL Small-Body Database Browser: 1690 Mayrhofer (1948 VB)" (2017-01-09 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1690) Mayrhofer. Springer Berlin Heidelberg. p. 134. ISBN 978-3-540-00238-3. Retrieved 19 December 2016.
  3. ^ a b c d e f "LCDB Data for (1690) Mayrhofer". Asteroid Lightcurve Database (LCDB). Retrieved 19 December 2016.
  4. ^ 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 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 December 2016.
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 19 December 2016.
  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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 19 December 2016.
  8. ^ 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 19 December 2016.
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1690) Mayrhofer". Geneva Observatory. Retrieved 19 December 2016.
  10. ^ 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 19 December 2016.
  11. ^ a b "1690 Mayrhofer (1948 VB)". Minor Planet Center. Retrieved 19 December 2016.
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 December 2016.

External links[edit]