+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1648 Shajna (1935 RF) Classification: Main-belt Asteroid          SPK-ID: 2001648 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2062200781080879 3.1057e-08   a 2.236151401308091 5.3635e-09 au q 1.775012084668827 7.0128e-08 au i 4.57236358132822 3.4678e-06 deg node 130.3989073625201 4.6154e-05 deg peri 134.6947159812239 4.6974e-05 deg M 185.7702677800016 9.9683e-06 deg tp 2459591.612307972968 (2022-Jan-12.11230797) 3.4745e-05 TDB period 1221.378395976452 3.34 4.3943e-06 1.203e-08 d yr n .2947489501909781 1.0605e-09 deg/d Q 2.697290717947356 6.4696e-09 au   Orbit Determination Parameters    # obs. used (total)      3021      data-arc span      36389 days (99.63 yr)      first obs. used      1921-04-01      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43578      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:54   Additional Information  Earth MOID = .762791 au   Jupiter MOID = 2.39517 au   T_jup = 3.606  [ 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 12.1   n/a MPO502169   diameter diameter 9.450 km 0.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.4156 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Skiff, B.A. (2018) Posting on CALL web site: http://www.minorplanet.info/call.html] geometric albedo albedo 0.191   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   B-V BV 0.792   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=15.91 deg. U-B UB 0.497   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=15.91 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1648 Shajna (1935 RF)          Discovered 1935-Sep-05 by Shajn, P. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1935 RF = 1934 CK1 = 1938 MC = 1941 FD = 1948 LC = 1951 EX2 = 1952 SX = 1952 UW = 1955 QT = 1955 RP = A921 GB = A924 EQ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 07:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin