+ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2354245070298862 4.0778e-08   a 3.102778221274424 1.0936e-08 au q 2.372308188107826 1.2394e-07 au i 12.66317249581568 3.9308e-06 deg node 265.1052121967992 2.0793e-05 deg peri 96.58847493894206 2.2408e-05 deg M 348.074851237358 7.5035e-06 deg tp 2459066.628067794722 (2020-Aug-05.12806779) 4.165e-05 TDB period 1996.294124286091 5.47 1.0555e-05 2.89e-08 d yr n .1803341479696746 9.5344e-10 deg/d Q 3.833248254441023 1.3511e-08 au   Orbit Determination Parameters    # obs. used (total)      2328      data-arc span      25954 days (71.06 yr)      first obs. used      1949-10-26      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43942      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:00:57   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. 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-Jan-24 13:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin