997 Priska

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997 Priska
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date12 July 1923
MPC designation(997) Priska
Named after
A girl's name picked from a
popular German calendar[2]
1923 NR · 1959 WA
1967 RN
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.71 yr (34,229 days)
Aphelion3.1568 AU
Perihelion2.1787 AU
2.6677 AU
4.36 yr (1,592 days)
0° 13m 34.32s / day
Physical characteristics
Dimensions16.71±0.31 km[5]
18.20±0.28 km[6]
18.59 km (derived)[3]
18.60±5.07 km[7]
18.70±1.6 km[8]
19.45±1.99 km[9]
20.274±0.123 km[10]
20.391±0.119 km[11]
16.22±0.01 h[12]
0.0511 (derived)[3]
SMASS = Ch[1]
12.00[6][8][11] · 12.31±0.29[13] · 12.40[7] · 12.5[1][3] · 12.51[9] · 13.07[5]

997 Priska, provisional designation 1923 NR, is a carbonaceous Adeonian asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 12 July 1923, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany;[14] the asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.[2]

Orbit and classification[edit]

Priska is a member of the Adeona family (505),[4] a large family of carbonaceous asteroids in the central main belt, named after 145 Adeona.[15]:23 It orbits the Sun at a distance of 2.2–3.2 AU once every 4 years and 4 months (1,592 days). Its orbit has an eccentricity of 0.18 and an inclination of 11° with respect to the ecliptic.[1]

The body's observation arc begins with its official discovery observation at Heidelberg.[14]

Physical characteristics[edit]

In the SMASS classification, Priska is a Ch-subtype, a hydrated carbonaceous C-type asteroid.[1]

Rotation period[edit]

In August 2006, a rotational lightcurve of Priska was obtained from photometric observations by Italian amateur astronomers Roberto Crippa and Federico Manzini. Lightcurve analysis gave a rotation period of 16.22 hours with a brightness amplitude of 0.61 magnitude (U=2).[12] A high brightness variation is typically indicative for an elongated rather than spherical shape.

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Priska measures between 16.71 and 20.391 kilometers in diameter and its surface has an albedo between 0.037 and 0.088.[5][6][7][8][9][10][11]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0511 and a diameter of 18.59 kilometers based on an absolute magnitude of 12.5.[3]


This minor planet was named after a girl's name picked from the German popular calendar Der Lahrer hinkende Bote.(de)

Reinmuth's Calendar Girls[edit]

As with 913 Otila and 1144 Oda, Reinmuth selected names from this calendar due to his many asteroid discoveries that he had trouble thinking of proper names; these names are not related to the discoverer's contemporaries. The author of the Dictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomer Ingrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg.[2]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 997 Priska (1923 NR)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 28 October 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(997) Priska". Dictionary of Minor Planet Names – (997) Priska. Springer Berlin Heidelberg. p. 86. doi:10.1007/978-3-540-29925-7_998. ISBN 978-3-540-00238-3.
  3. ^ a b c d e "LCDB Data for (997) Priska". Asteroid Lightcurve Database (LCDB). Retrieved 28 October 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 28 October 2017.
  5. ^ 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 28 October 2017.
  6. ^ 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 28 October 2017.
  7. ^ 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:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 28 October 2017.
  8. ^ 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: IRAS–A–FPA–3–RDR–IMPS–V6.0. Bibcode:2004PDSS...12.....T. Archived from the original on 3 June 2016. Retrieved 28 October 2017.
  9. ^ 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:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 28 October 2017.
  10. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 28 October 2017.
  11. ^ 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.
  12. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (997) Priska". Geneva Observatory. Retrieved 28 October 2017.
  13. ^ 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 October 2017.
  14. ^ a b "997 Priska (1923 NR)". Minor Planet Center. Retrieved 28 October 2017.
  15. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.

External links[edit]