+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1499 Pori (1938 UF) Classification: Main-belt Asteroid          SPK-ID: 2001499 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .187059832672468 3.5263e-08   a 2.669607073875681 8.4314e-09 au q 2.170230821335259 9.7916e-08 au i 12.1805658828724 3.7991e-06 deg node 239.6166373181588 1.6416e-05 deg peri 74.81960476919409 1.9481e-05 deg M 306.7459901268983 1.1383e-05 deg tp 2459236.178115692202 (2021-Jan-21.67811569) 5.0838e-05 TDB period 1593.196866327378 4.36 7.5477e-06 2.066e-08 d yr n .2259607758518057 1.0705e-09 deg/d Q 3.168983326416103 1.0009e-08 au   Orbit Determination Parameters    # obs. used (total)      2665      data-arc span      28582 days (78.25 yr)      first obs. used      1942-08-11      last obs. used      2020-11-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40082      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:00:57   Additional Information  Earth MOID = 1.19406 au   Jupiter MOID = 2.19494 au   T_jup = 3.325  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.4   n/a MPO384761   diameter diameter 14.896 km 0.348 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.3557 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D. (2004) Minor Planet Bull. 31, 4-6.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Benishek, V. (2018) Minor Planet Bull. 45, 187-189.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.240   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1499 Pori (1938 UF)          Discovered 1938-Oct-16 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1938 UF = 1951 RU1 = 1959 NA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 00:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin