1000 Piazzia

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1000 Piazzia
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 12 August 1923
MPC designation (1000) Piazzia
Named after
Giuseppe Piazzi
1923 NZ · 1951 OB
1967 ED
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 93.25 yr (34,058 days)
Aphelion 3.9889 AU
Perihelion 2.3533 AU
3.1711 AU
Eccentricity 0.2579
5.65 yr (2,063 days)
0° 10m 28.2s / day
Inclination 20.571°
Physical characteristics
Dimensions 45.72±12.12 km[4]
47.15 km (derived)[3]
47.78±2.0 km (IRAS:17)[5]
49.54±6.12 km[6]
51.55±0.86 km[7]
9.2±0.2 h[8]
9.47±0.01 h[9]
0.0457 (derived)[3]
0.1119±0.010 (IRAS:17)[5]
Temperature 152 K (−121 °C) (mean)[10]
9.6[5][7] · 10.6[1][3][4] · 10.61[6] · 10.84±0.20[11]

1000 Piazzia, provisional designation 1923 NZ, is a dark asteroid from the outer region of the asteroid belt, approximately 47 kilometers in diameter. It was discovered on 12 August 1923, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after Italian Giuseppe Piazzi, who discovered 1 Ceres.[2][12]

Orbit and classification[edit]

Orbit of Piazzia (blue), the inner planets and Jupiter

Piazzia orbits the Sun in the outer main-belt at a distance of 2.4–4.0 AU once every 5 years and 8 months (2,063 days). Its orbit has an eccentricity of 0.26 and an inclination of 21° with respect to the ecliptic.[1] As no precoveries were taken, the body's observation arc begins with its first recorded observation on the night following its official discovery date.[12]

Physical characteristics[edit]

Rotation period[edit]

After Piazzia had been published by The Minor Planet Bulletin as an opportunity for photometry in 2001, a classically shaped bimodal lightcurve was obtained at the Santana Observatory (646) in Rancho Cucamonga, California. The lightcurve gave a rotation period of 9.47±0.01 hours with a brightness variation of 0.45 magnitude (U=3).[9] A second lightcurve was obtained by astronomer René Roy in March 2007, rendering a period of 9.2±0.2 hours and an amplitude of 0.2 magnitude (U=2).[8]

Diameter and albedo[edit]

According to the space-based surveys carried out by Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Piazzia measures between 45.72 and 51.55 kilometers and its surface has an albedo between 0.041 and 0.112.[4][5][6][7] The Collaborative Asteroid Lightcurve Link (CALL) derives a low albedo of 0.046 (in accordance with AKARI) and a diameter of 47.15 kilometers (in accordance with IRAS), based on an absolute magnitude of 10.6.[3] Although CALL derives an albedo of less than 0.05, it classifies the body as a S-type rather than a carbonaceous C-type asteroid.[3]


This minor planet was named in honour of Italian Theatine monk Giuseppe Piazzi (1746–1826). He was a director of both the Palermo Observatory and Naples Observatory, known for the compilation of the Palermo Catalogue, containing the precise position of 7,646 stars. In 1801, Piazzi discovered 1 Ceres, the first and largest asteroid and the main-belt's only dwarf planet. He is also honoured by the lunar crater Piazzi. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 96).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1000 Piazzia (1923 NZ)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 7 April 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1000) Piazzia. Springer Berlin Heidelberg. p. 86. ISBN 978-3-540-00238-3. Retrieved 7 April 2017.
  3. ^ a b c d e f g "LCDB Data for (1000) Piazzia". Asteroid Lightcurve Database (LCDB). Retrieved 7 April 2017.
  4. ^ 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 7 April 2017.
  5. ^ 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 7 April 2017.
  6. ^ 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 7 April 2017.
  7. ^ 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 7 April 2017.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1000) Piazzia". Geneva Observatory. Retrieved 7 April 2017.
  9. ^ a b Stephens, R. D. (September 2001). "Rotational Periods and Lightcurves of 1096 Reunerta and 1000 Piazzia". The Minor Planet Bulletin. 28: 56. Bibcode:2001MPBu...28...56S. Retrieved 7 April 2017.
  10. ^ "Planetary Habitability Calculators". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 22 December 2015.
  11. ^ 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 7 April 2017.
  12. ^ a b "1000 Piazzia (1923 NZ)". Minor Planet Center. Retrieved 7 April 2017.

External links[edit]