+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2744 Birgitta (1975 RB) Classification: Mars-crossing Asteroid          SPK-ID: 2002744 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3324461787041686 4.8223e-08   a 2.302021399868598 4.2676e-09 au q 1.536723182187061 1.1111e-07 au i 6.744529885429879 3.5882e-06 deg node 315.5398934977064 3.5284e-05 deg peri 43.9629305623514 3.5523e-05 deg M 341.192167806044 5.2582e-06 deg tp 2459267.149777242890 (2021-Feb-21.64977724) 1.8717e-05 TDB period 1275.74084881249 3.49 3.5475e-06 9.713e-09 d yr n .2821889730466046 7.847e-10 deg/d Q 3.067319617550134 5.6863e-09 au   Orbit Determination Parameters    # obs. used (total)      1700      data-arc span      31796 days (87.05 yr)      first obs. used      1933-08-27      last obs. used      2020-09-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45863      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 14:11:37   Additional Information  Earth MOID = .539897 au   Jupiter MOID = 2.41886 au   T_jup = 3.506  [ hide covariance matrix ] Orbital Elements at Epoch 2456900.5 (2014-Aug-31.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3307713585146554 4.7912e-08   q 1.541053575846026 1.1017e-07 au tp 2456714.828003141053 (2014-Feb-26.32800314) 1.7071e-05 TDB node 315.6321552744834 3.5196e-05 deg peri 43.79265219648711 3.5456e-05 deg i 6.751857514123472 3.5875e-06 deg   Orbit Determination Parameters    # obs. used (total)      1700      data-arc span      31796 days (87.05 yr)      first obs. used      1933-08-27      last obs. used      2020-09-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45863      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 14:11:37   Additional Information  Jupiter MOID = 2.41886 au   T_jup = 3.506  Orbit Covariance (6×6)   e q tp node peri i e 2.295514558251391E-15 -5.276794675325085E-15 3.593715388151296E-13 1.160727682568964E-14 9.567126695697824E-15 -1.660120641183887E-14 q -5.276794675325085E-15 1.213805602682435E-14 -8.21428876817566E-13 -2.66617514328941E-14 -2.036422317834685E-14 3.820632599106056E-14 tp 3.593715388151296E-13 -8.21428876817566E-13 2.914202086781999E-10 5.172168807229667E-12 8.17194795967415E-11 -4.420376604362557E-12 node 1.160727682568964E-14 -2.66617514328941E-14 5.172168807229667E-12 1.238781127532199E-9 -1.229444330082781E-9 3.377548862560466E-11 peri 9.567126695697824E-15 -2.036422317834685E-14 8.17194795967415E-11 -1.229444330082781E-9 1.257143651795015E-9 -3.433052201257811E-11 i -1.660120641183887E-14 3.820632599106056E-14 -4.420376604362557E-12 3.377548862560466E-11 -3.433052201257811E-11 1.287029207943361E-11 [ 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 14.69   n/a E2021B10   rotation period rot_per 8.994 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Lagerkvist, C.-I. (1976) Icarus 29, 143-145.] [Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html] [Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.] [Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46, 458-503.] B-V BV 0.909   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.09 deg. U-B UB 0.527   0.061 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.09 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices SMASSII spectral type spec_B S   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) 2744 Birgitta (1975 RB)          Discovered 1975-Sep-04 by Lagerkvist, C.-I. at Kvistaberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1975 RB = 1933 QY  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 05:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin