1008 La Paz

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1008 La Paz
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date31 October 1923
(1008) La Paz
Named after
La Paz (Bolivian capital)[2]
1923 PD · 1950 UN
1970 JA
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc93.41 yr (34,118 days)
Aphelion3.3333 AU
Perihelion2.8495 AU
3.0914 AU
5.44 yr (1,985 days)
0° 10m 52.68s / day
Physical characteristics
Dimensions38.54 km (derived)[3]
38.64±2.7 km[4]
39.02±0.66 km[5]
40.13±13.98 km[6]
41.061±0.240 km[7]
45.450±0.245 km[8]
49.27±17.54 km[9]
50.50±0.91 km[10]
8.998±0.002 h[11]
9.002±0.001 h[11]
0.0684 (derived)[3]
10.40[4][8][10] · 10.50[5] · 10.60[1][3][9] · 10.74[6] · 10.92±0.75[12]

La Paz (minor planet designation: 1008 La Paz), provisional designation 1923 PD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 31 October 1923, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory and named after the city La Paz in Bolivia.[2][13]

Orbit and classification[edit]

La Paz is a background asteroid as it does not belong to any known asteroid family. It orbits the Sun in the outer main-belt at a distance of 2.8–3.3 AU once every 5 years and 5 months (1,985 days). Its orbit has an eccentricity of 0.08 and an inclination of 9° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, 10 days after its official discovery observation.[13]

Physical characteristics[edit]

La Paz is an assumed carbonaceous C-type asteroid.[3]


In November 2005, a rotational lightcurve of La Paz was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a well-defined rotation period of 8.998 hours with a brightness amplitude of 0.14 magnitude (U=3).[11] In March 2007, a concurring period of 9.002 hours and an amplitude of 0.14 magnitude (U=3-) was obtained by astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station in Italy (A12).[11]

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, La Paz measures between 38.64 and 50.50 kilometers in diameter and its surface has an albedo between 0.04 and 0.099.[4][5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0684 and a diameter of 38.54 kilometers based on an absolute magnitude of 10.6.[3]


This minor planet was named after La Paz, the capital city of Bolivia in South America. The official naming citation was 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: 1008 La Paz (1923 PD)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 29 August 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1008) la Paz". Dictionary of Minor Planet Names – (1008) La Paz. Springer Berlin Heidelberg. p. 87. doi:10.1007/978-3-540-29925-7_1009. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1008) La Paz". Asteroid Lightcurve Database (LCDB). Retrieved 29 August 2017.
  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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  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 29 August 2017.
  6. ^ 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 29 August 2017.
  7. ^ 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 29 August 2017.
  8. ^ 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.
  9. ^ 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 29 August 2017.
  10. ^ 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. (online, AcuA catalog p. 153)
  11. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1008) La Paz". Geneva Observatory. Retrieved 29 August 2017.
  12. ^ 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 29 August 2017.
  13. ^ a b "1008 La Paz (1923 PD)". Minor Planet Center. Retrieved 29 August 2017.

External links[edit]