+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2354244975286907 4.1487e-08   a 3.102778231328276 1.4558e-08 au q 2.372308225274857 1.2772e-07 au i 12.66316936728147 5.0192e-06 deg node 265.105204586787 2.2576e-05 deg peri 96.58848888188967 2.4901e-05 deg M 348.0748413696054 1.2433e-05 deg tp 2459066.628122835400 (2020-Aug-05.12812284) 6.9211e-05 TDB period 1996.294133988901 5.47 1.405e-05 3.847e-08 d yr n .1803341470931765 1.2692e-09 deg/d Q 3.833248237381696 1.7986e-08 au   Orbit Determination Parameters    # obs. used (total)      1995      data-arc span      25850 days (70.77 yr)      first obs. used      1949-10-26      last obs. used      2020-08-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46625      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:35:56   Additional Information  Earth MOID = 1.41093 au   Jupiter MOID = 1.96335 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 11.8   n/a MPO265964   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. 2019-August); 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 ] 2020-Oct-23 02:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin