+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2353761297909791 9.7863e-09   a 3.102629810824725 1.0039e-08 au q 2.372344813778684 2.8705e-08 au i 12.66311392631782 6.0571e-07 deg node 265.1052744140984 2.1271e-06 deg peri 96.62077065703087 6.3218e-06 deg M 24.12404276501487 4.2355e-06 deg tp 2459066.735473288989 (2020-Aug-05.23547329) 2.3284e-05 TDB period 1996.150897468965 5.47 9.6878e-06 2.652e-08 d yr n .1803470872149319 8.7527e-10 deg/d Q 3.832914807870766 1.2401e-08 au   Orbit Determination Parameters    # obs. used (total)      2583      data-arc span      26068 days (71.37 yr)      first obs. used      1949-10-26      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42636      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:32:20   Additional Information  Earth MOID = 1.4095 au   Jupiter MOID = 1.9645 au   T_jup = 3.142  [ 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-Apr-13 21:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin