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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1301210549242542 2.9356e-08  
a 2.22701533950815 5.7904e-09 au
q 1.937233754198854 6.4606e-08 au
i 4.344405426631166 4.3364e-06 deg
node 20.27021168989766 4.2366e-05 deg
peri 65.65196806348716 4.609e-05 deg
M 193.8225011689726 1.9025e-05 deg
tp 2459560.841717295274
(2021-Dec-12.34171730)
6.514e-05 TDB
period 1213.900917063476
3.32
4.7344e-06
1.296e-08
d
yr
n .2965645671237065 1.1566e-09 deg/d
Q 2.516796924817447 6.5439e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2608  
   data-arc span      32528 days (89.06 yr)  
   first obs. used      1931-10-09  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45151  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:15:13  

Additional Information
 Earth MOID = .958095 au 
 Jupiter MOID = 2.67052 au 
 T_jup = 3.630 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456704.5 (2014-Feb-16.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1304418275540178 2.9416e-08  
q 1.935798637379816 6.4737e-08 au
tp 2457134.475505542873
(2015-Apr-21.97550554)
6.1076e-05 TDB
node 20.32642303225554 4.2358e-05 deg
peri 65.64019674118583 4.6051e-05 deg
i 4.345804056236927 4.3366e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2608  
   data-arc span      32528 days (89.06 yr)  
   first obs. used      1931-10-09  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45151  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:15:13  

Additional Information
 Jupiter MOID = 2.67052 au 
 T_jup = 3.630 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.6529003107381E-16 -1.89873118107444E-15 -1.115966505560472E-14 1.143452804557447E-15 -3.025604854123288E-14 -2.73390363722369E-17
q -1.89873118107444E-15 4.190940964680108E-15 1.246183146630542E-13 -3.234673270977113E-15 9.286472674720713E-14 5.152572864727555E-17
tp -1.115966505560472E-14 1.246183146630542E-13 3.730337115349723E-9 -1.642488607092509E-11 1.108781661007963E-9 -5.881998040434922E-13
node 1.143452804557447E-15 -3.234673270977113E-15 -1.642488607092509E-11 1.794200398406012E-9 -1.793306978456442E-9 -3.189266786714309E-11
peri -3.025604854123288E-14 9.286472674720713E-14 1.108781661007963E-9 -1.793306978456442E-9 2.120725421949443E-9 3.164152124925916E-11
i -2.73390363722369E-17 5.152572864727555E-17 -5.881998040434922E-13 -3.189266786714309E-11 3.164152124925916E-11 1.880637739652393E-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. 2019-August); 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]
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.DBLast Updated: 2003-08-29

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Alternate Designations
 1931 TW1 = 1941 SK2 = 1961 TN1 = 1961 VF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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