+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1498 Lahti (1938 SK1) Classification: Main-belt Asteroid          SPK-ID: 2001498 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2354709768348491 9.7774e-09   a 3.103349980121174 1.0014e-08 au q 2.372601128841632 2.8685e-08 au i 12.66213272384659 6.0564e-07 deg node 265.106590224525 2.1272e-06 deg peri 96.66348062518465 6.3205e-06 deg M 59.42446288367834 4.2899e-06 deg tp 2459066.884728501176 (2020-Aug-05.38472850) 2.3272e-05 TDB period 1996.84594494111 5.47 9.6652e-06 2.646e-08 d yr n .180284313325241 8.7262e-10 deg/d Q 3.834098831400716 1.2372e-08 au   Orbit Determination Parameters    # obs. used (total)      2630      data-arc span      26102 days (71.46 yr)      first obs. used      1949-10-26      last obs. used      2021-04-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42378      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:27:20   Additional Information  Earth MOID = 1.41045 au   Jupiter MOID = 1.96417 au   T_jup = 3.141  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.90   n/a E2021B10   diameter diameter 31.605 km 0.579 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 58. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Ruthroff, J.C. (2011) Minor Planet Bull. 38, 86-88.] geometric albedo albedo 0.034   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1498 Lahti (1938 SK1)          Discovered 1938-Sep-16 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-27 00:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin