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2889 Brno (1981 WT1)
Classification: Main-belt Asteroid          SPK-ID: 2002889
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1172896655345441 3.255e-08  
a 3.021498614268657 1.3983e-08 au
q 2.667108052387998 9.9017e-08 au
i 9.49721272125289 3.4474e-06 deg
node 220.1767964499622 2.1237e-05 deg
peri 124.5057602418588 2.5467e-05 deg
M 206.9372162708014 1.5546e-05 deg
tp 2460016.141158315791
(2023-Mar-12.64115832)
8.5003e-05 TDB
period 1918.368461880201
5.25
1.3317e-05
3.646e-08
d
yr
n .1876594654017417 1.3027e-09 deg/d
Q 3.375889176149316 1.5623e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3059  
   data-arc span      24791 days (67.87 yr)  
   first obs. used      1953-05-07  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39464  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:36:04  

Additional Information
 Earth MOID = 1.67323 au 
 Jupiter MOID = 2.11478 au 
 T_jup = 3.215 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457288.5 (2015-Sep-23.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .115470799701856 3.248e-08  
q 2.674399368081921 9.8492e-08 au
tp 2458096.631898528537
(2017-Dec-09.13189853)
8.1824e-05 TDB
node 220.2133064681167 2.1247e-05 deg
peri 124.2777478880597 2.5605e-05 deg
i 9.49163806547708 3.4459e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3059  
   data-arc span      24791 days (67.87 yr)  
   first obs. used      1953-05-07  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39464  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:36:04  

Additional Information
 Jupiter MOID = 2.11478 au 
 T_jup = 3.215 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.054947856164787E-15 -3.173856865088259E-15 2.063388621518079E-13 3.460909798051455E-15 1.71114787853264E-14 -2.411428097830129E-19
q -3.173856865088259E-15 9.700688681230709E-15 -3.638554285915152E-13 -9.221175510926284E-15 -2.224586820515269E-14 5.082596570168941E-16
tp 2.063388621518079E-13 -3.638554285915152E-13 6.695219267069059E-9 1.307230246922006E-11 1.182994257620119E-9 -2.378149622729869E-12
node 3.460909798051455E-15 -9.221175510926284E-15 1.307230246922006E-11 4.514409159988551E-10 -4.426198645296016E-10 -9.922300586042794E-12
peri 1.71114787853264E-14 -2.224586820515269E-14 1.182994257620119E-9 -4.426198645296016E-10 6.556405367918581E-10 9.37230084768401E-12
i -2.411428097830129E-19 5.082596570168941E-16 -2.378149622729869E-12 -9.922300586042794E-12 9.37230084768401E-12 1.187409184622368E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.63   n/a MPCxxxxx  
diameter diameter 17.184 km 0.297 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.51 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.150   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2889 Brno (1981 WT1)          Discovered 1981-Nov-17 by Mrkos, A. at Klet
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 WT1 = 1953 JE = 1958 GE = 1970 SF1 = 1976 UO4 = 1983 AB1 = 1984 HN2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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