+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1271 Isergina (1931 TN) Classification: Main-belt Asteroid          SPK-ID: 2001271 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1203030738350089 3.4043e-08   a 3.13875445919262 1.4629e-08 au q 2.761152649738407 1.1005e-07 au i 6.68335525159559 3.9735e-06 deg node 126.8428663214338 3.3368e-05 deg peri 271.8135487260378 3.7507e-05 deg M 335.3859486082507 1.8093e-05 deg tp 2459139.372112895805 (2020-Oct-16.87211290) 0.00010225 TDB period 2031.114660760315 5.56 1.42e-05 3.888e-08 d yr n .1772425786465643 1.2391e-09 deg/d Q 3.516356268646833 1.6389e-08 au   Orbit Determination Parameters    # obs. used (total)      2906      data-arc span      41695 days (114.15 yr)      first obs. used      1906-04-17      last obs. used      2020-06-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42927      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:28:41   Additional Information  Earth MOID = 1.77925 au   Jupiter MOID = 1.92059 au   T_jup = 3.189  [ 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 10.3   n/a MPO435707   diameter diameter 47.524 km 0.383 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 7.59932 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Aznar Macias, A.; Carreno Garcerain, A.; Arce Masego, E.; Brines Rodriques, P.; et al. (2016) Minor Planet Bull. 43, 257-263.] [Benishek, V. (2016) Minor Planet Bull. 43, 339-342.] geometric albedo albedo 0.031   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 1271 Isergina (1931 TN)          Discovered 1931-Oct-10 by Neujmin, G. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1931 TN = 1930 MK = 1932 CK1 = 2003 RV22 = 2019 GW35 = A906 HD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-13 05:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin