1499 Pori

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1499 Pori
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 16 October 1938
MPC designation (1499) Pori
Named after
Pori[2] (Finnish city)
1938 UF · 1951 RU1
1959 NA
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 74.34 yr (27,154 days)
Aphelion 3.1679 AU
Perihelion 2.1729 AU
2.6704 AU
Eccentricity 0.1863
4.36 yr (1,594 days)
0° 13m 33.24s / day
Inclination 12.180°
Physical characteristics
Dimensions 13.37±0.89 km[5]
13.995±0.401 km[6]
14.896±0.348 km[7]
14.90±0.35 km[7]
15.22 km (calculated)[3]
3.3557±0.0004 h[8]
3.36±0.01 h[8]
3.36±0.01 h[9]
3.36±0.05 h[8]
0.21 (assumed)[3]
S (assumed)[3]
11.20[5][6] · 11.30[7] · 11.4[1][3]

1499 Pori, provisional designation 1938 UF, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 16 October 1938, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in southwest Finland.[10] The asteroid was named after the Finnish city of Pori.[2]

Orbit and classification[edit]

Pori is a member of the Eunomia family (502),[4] a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[11]:23 It orbits the Sun in the central main belt at a distance of 2.2–3.2 AU once every 4 years and 4 months (1,594 days). Its orbit has an eccentricity of 0.19 and an inclination of 12° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Turku in October 1938.[10]

Physical characteristics[edit]

Pori is an assumed S-type asteroid which corresponds to the Eunomia family's overall spectral type.[3][11]:23

Rotation period[edit]

Several rotational lightcurves of Pori have been obtained from photometric observations since 2003.[8][9]

In August 2003, photometric observations made by Robert Stephens at the Santana Observatory (646) in California, gave a synodic rotation period of 3.36 hours. The lightcurve shows a brightness variation of 0.28 in magnitude (U=3).[9] In August 2016, another lightcurve by Maurice Audejean gave a refined rotation period of 3.3557 hours with an amplitude of 0.34 magnitude (U=3).[8]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Pori measures between 13.37 and 14.90 kilometers in diameter and its surface has an albedo between 0.240 and 0.330.[5][6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.21 – derived from 15 Eunomia, the largest member and namesake of the Eunomia family – and calculates a diameter of 15.22 kilometers based on an absolute magnitude of 11.4.[3]


This minor planet was named after the city of Pori, located near the Gulf of Bothnia in Finland.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3928).[12]


  1. ^ a b c d "JPL Small-Body Database Browser: 1499 Pori (1938 UF)" (2016-12-14 last obs.). Jet Propulsion Laboratory. Retrieved 27 September 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1499) Pori. Springer Berlin Heidelberg. p. 119. ISBN 978-3-540-00238-3. Retrieved 27 September 2017. 
  3. ^ a b c d e f g "LCDB Data for (1499) Pori". Asteroid Lightcurve Database (LCDB). Retrieved 27 September 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 27 September 2017. 
  5. ^ 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 27 September 2017. 
  6. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 27 September 2017. 
  7. ^ a b c d e 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 27 September 2017. 
  8. ^ a b c d e Behrend, Raoul. "Asteroids and comets rotation curves – (1499) Pori". Geneva Observatory. Retrieved 27 September 2017. 
  9. ^ a b c Stephens, Robert D. (March 2004). "Photometry of 683 Lanzia, 1101 Clematis, 1499 Pori, 1507 Vaasa, and 3893 DeLaeter". The Minor Planet Bulletin. 31 (1): 4–6. Bibcode:2004MPBu...31....4S. ISSN 1052-8091. Retrieved 27 September 2017. 
  10. ^ a b "1499 Pori (1938 UF)". Minor Planet Center. Retrieved 27 September 2017. 
  11. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 27 September 2017. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 September 2017. 

External links[edit]