+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1504 Lappeenranta (1939 FM) Classification: Main-belt Asteroid          SPK-ID: 2001504 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1578137173772097 3.7335e-08   a 2.399378012650174 6.9075e-09 au q 2.020723249080708 8.9964e-08 au i 11.05125522470741 3.5967e-06 deg node 94.85933650082482 2.3165e-05 deg peri 50.79727761341599 2.6502e-05 deg M 333.4852140422235 1.3233e-05 deg tp 2459100.484358345257 (2020-Sep-07.98435835) 5.0038e-05 TDB period 1357.520632510918 3.72 5.8622e-06 1.605e-08 d yr n .2651893395786782 1.1452e-09 deg/d Q 2.77803277621964 7.9976e-09 au   Orbit Determination Parameters    # obs. used (total)      3141      data-arc span      29774 days (81.52 yr)      first obs. used      1939-05-12      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37003      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:02   Additional Information  Earth MOID = 1.05321 au   Jupiter MOID = 2.29886 au   T_jup = 3.485  [ 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 11.6   n/a MPO502168 IRAS observations used: 3 diameter diameter 11.336 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 15.190 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Garlitz, J. (2013) Posting on CALL web site. http://www.minorplanet.info/call.html] [Polakis, T.; Skiff, B.A. (2017) Minor Planet Bull. 44, 299-302.] [Ditteon, R.; Johnson, D.; Lin, W.; Wang, Z.; Zhao, B. (2019) Minor Planet Bull. 46, 280-282.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.270   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.880   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.51 deg. U-B UB 0.418   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.51 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1504 Lappeenranta (1939 FM)          Discovered 1939-Mar-23 by Oterma, L. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 21:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin