1000 Piazzia

From Wikipedia, the free encyclopedia
Jump to: navigation, search
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 47.15 km (derived)[3]
47.78±2.0 km (IRAS:17)[4]
49.54±6.12 km[5]
51.55±0.86 km[6]
9.2±0.2 h[7]
9.47±0.01 h[8]
0.0457 (derived)[3]
0.1119±0.010 (IRAS:17)[4]
Temperature 152 K (−121 °C) (mean)[9]
9.6[4][6] · 10.6[1][3] · 10.61[5] · 10.84±0.20[10]

1000 Piazzia, provisional designation 1923 NZ, is a dark asteroid from the outer region of the asteroid belt, approximately 48 kilometers in diameter. It was discovered on 12 August 1923, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[11]

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

Piazzia orbits the Sun 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.[11]

After Piazzia had been published by The Minor Planet Bulletin as an opportunity for photometry in 2001, a classically shaped bimodal light-curve was obtained at the Santana Observatory (646) in Rancho Cucamonga, California. The light-curve gave a rotation period of 9.47±0.01 hours with a brightness variation of 0.45 magnitude (U=3).[8] A second light-curve 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).[7]

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 47.8 and 51.6 kilometers and its surface has an albedo between 0.041 and 0.112.[4][5][6] The Collaborative Asteroid Lightcurve Link (CALL) derives a low albedo of 0.046 (in accordance with AKARI) and a diameter of 47.2 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]

The 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 (H 96).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1000 Piazzia (1923 NZ)" (2016-11-10 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1000) Piazzia. Springer Berlin Heidelberg. p. 86. ISBN 978-3-540-00238-3. Retrieved 13 April 2016. 
  3. ^ a b c d e f g "LCDB Data for (1000) Piazzia". Asteroid Lightcurve Database (LCDB). Retrieved 13 April 2016. 
  4. ^ 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 13 April 2016. 
  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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 13 April 2016. 
  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 13 April 2016. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1000) Piazzia". Geneva Observatory. Retrieved 13 April 2016. 
  8. ^ 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 13 April 2016. 
  9. ^ "Planetary Habitability Calculators". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 22 December 2015. 
  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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 13 April 2016. 
  11. ^ a b "1000 Piazzia (1923 NZ)". Minor Planet Center. Retrieved 13 April 2016. 

External links[edit]