+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1814 Bach (1931 TW1) Classification: Main-belt Asteroid          SPK-ID: 2001814 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .130121055502672 2.933e-08   a 2.227015339581531 5.7884e-09 au q 1.937233752974541 6.4552e-08 au i 4.344405256228883 4.3311e-06 deg node 20.27021135849946 4.2363e-05 deg peri 65.65196808516608 4.6083e-05 deg M 193.8225013797228 1.9019e-05 deg tp 2459560.841716612331 (2021-Dec-12.34171661) 6.5121e-05 TDB period 1213.900917123473 3.32 4.7327e-06 1.296e-08 d yr n .2965645671090487 1.1562e-09 deg/d Q 2.516796926188521 6.5416e-09 au   Orbit Determination Parameters    # obs. used (total)      2619      data-arc span      32546 days (89.11 yr)      first obs. used      1931-10-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45143      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:02:50   Additional Information  Earth MOID = .958095 au   Jupiter MOID = 2.67052 au   T_jup = 3.630  [ hide covariance matrix ] Orbital Elements at Epoch 2456711.5 (2014-Feb-23.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1304397669395749 2.939e-08   q 1.935800134918915 6.4684e-08 au tp 2457134.481543575806 (2015-Apr-21.98154358) 6.1051e-05 TDB node 20.32618397115521 4.2356e-05 deg peri 65.64203641198118 4.6044e-05 deg i 4.345809836231935 4.3314e-06 deg   Orbit Determination Parameters    # obs. used (total)      2619      data-arc span      32546 days (89.11 yr)      first obs. used      1931-10-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45143      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:02:50   Additional Information  Jupiter MOID = 2.67052 au   T_jup = 3.630  Orbit Covariance (6×6)   e q tp node peri i e 8.63751581033153E-16 -1.895454753950878E-15 -8.892394669293581E-15 1.137281306796371E-15 -2.940346338165712E-14 -3.030054021919667E-17 q -1.895454753950878E-15 4.183959261637234E-15 1.197934895515688E-13 -3.22421987837177E-15 9.105296556170998E-14 5.805538476529765E-17 tp -8.892394669293581E-15 1.197934895515688E-13 3.727214043927427E-9 -1.642248820488083E-11 1.107602499364765E-9 -5.877305428425144E-13 node 1.137281306796371E-15 -3.22421987837177E-15 -1.642248820488083E-11 1.794015438567122E-9 -1.793121151853655E-9 -3.198314768855786E-11 peri -2.940346338165712E-14 9.105296556170998E-14 1.107602499364765E-9 -1.793121151853655E-9 2.120095781780117E-9 3.173202169865848E-11 i -3.030054021919667E-17 5.805538476529765E-17 -5.877305428425144E-13 -3.198314768855786E-11 3.173202169865848E-11 1.876066040165713E-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 12.9   n/a MPO384765   diameter diameter 7.516 km 0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 7.2408 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm] [Carreño, A.; Fornas, G.; Arce, E.; Mas, V. (2020) Minor Planet Bull. 47, 7-10.] geometric albedo albedo 0.180   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   1814 Bach (1931 TW1)          Discovered 1931-Oct-09 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1931 TW1 = 1941 SK2 = 1961 TN1 = 1961 VF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 22:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin