+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3325757961878723 4.8172e-08   a 2.301760494387559 4.1988e-09 au q 1.536250665332826 1.1109e-07 au i 6.74400037205556 3.5889e-06 deg node 315.544221494638 3.5313e-05 deg peri 44.00313775373613 3.5554e-05 deg M 284.727764409846 5.1976e-06 deg tp 2459267.198724557926 (2021-Feb-21.69872456) 1.8721e-05 TDB period 1275.523970931613 3.49 3.4902e-06 9.556e-09 d yr n .2822369537571797 7.7228e-10 deg/d Q 3.067270323442292 5.5952e-09 au   Orbit Determination Parameters    # obs. used (total)      1696      data-arc span      31796 days (87.05 yr)      first obs. used      1933-08-27      last obs. used      2020-09-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45833      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:06:27   Additional Information  Earth MOID = .541088 au   Jupiter MOID = 2.41815 au   T_jup = 3.506  [ hide covariance matrix ] Orbital Elements at Epoch 2456893.5 (2014-Aug-24.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3307682019156709 4.7912e-08   q 1.541040550665752 1.1017e-07 au tp 2456714.824921145065 (2014-Feb-26.32492115) 1.7084e-05 TDB node 315.6322150180692 3.5216e-05 deg peri 43.79071469415812 3.5477e-05 deg i 6.751851183185464 3.5888e-06 deg   Orbit Determination Parameters    # obs. used (total)      1696      data-arc span      31796 days (87.05 yr)      first obs. used      1933-08-27      last obs. used      2020-09-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45833      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:06:27   Additional Information  Jupiter MOID = 2.41815 au   T_jup = 3.506  Orbit Covariance (6×6)   e q tp node peri i e 2.295534210257986E-15 -5.276864017561966E-15 3.593469351391006E-13 1.190094459526668E-14 9.252075429620317E-15 -1.662461618676449E-14 q -5.276864017561966E-15 1.21382716778084E-14 -8.213848084800191E-13 -2.733305485736488E-14 -1.965255836798029E-14 3.82606123491663E-14 tp 3.593469351391006E-13 -8.213848084800191E-13 2.918725516632037E-10 5.240088738384432E-12 8.188029328420173E-11 -4.429158419358644E-12 node 1.190094459526668E-14 -2.733305485736488E-14 5.240088738384432E-12 1.240173586691725E-9 -1.230818468908826E-9 3.366187634010361E-11 peri 9.252075429620317E-15 -1.965255836798029E-14 8.188029328420173E-11 -1.230818468908826E-9 1.258616238214404E-9 -3.422001191442412E-11 i -1.662461618676449E-14 3.82606123491663E-14 -4.429158419358644E-12 3.366187634010361E-11 -3.422001191442412E-11 1.287956367542992E-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 14.78   n/a PDS3 (MPC 17266)   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-Jan-22 10:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin