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3103 Eger (1982 BB)
Classification: Apollo [NEO]          SPK-ID: 2003103
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 543 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3542291417134177 1.1126e-08  
a 1.404144820557701 3.4387e-10 au
q .9067558059302053 1.549e-08 au
i 20.93108559567073 1.0313e-06 deg
node 129.7526093284639 1.9922e-06 deg
peri 254.0736553956078 2.9853e-06 deg
M 194.7595145776488 2.441e-06 deg
tp 2459479.452489569607
(2021-Sep-21.95248957)
4.1626e-06 TDB
period 607.7378433522489
1.66
2.2325e-07
6.112e-10
d
yr
n .5923606764625016 2.176e-10 deg/d
Q 1.901533835185196 4.6568e-10 au
  Orbit Determination Parameters
   # obs. used (total)      3413  
   # delay obs. used      1  
   # Doppler obs. used      3  
   data-arc span      14358 days (39.31 yr)  
   first obs. used      1982-01-21  
   last obs. used      2021-05-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39927  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-15 06:33:30  

Additional Information
 Earth MOID = .078152 au 
 Jupiter MOID = 3.70787 au 
 T_jup = 4.613 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456456.5 (2013-Jun-13.0) TDB
Reference: JPL 543 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3542471728189884 1.1137e-08  
q .9069632489348037 1.5486e-08 au
tp 2456440.244758413129
(2013-May-27.74475841)
3.7986e-06 TDB
node 129.8010402052548 1.9929e-06 deg
peri 254.0187706775631 2.9851e-06 deg
i 20.93119203602262 1.0312e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3413  
   # delay obs. used      1  
   # Doppler obs. used      3  
   data-arc span      14358 days (39.31 yr)  
   first obs. used      1982-01-21  
   last obs. used      2021-05-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39927  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-15 06:33:30  

Additional Information
 Jupiter MOID = 3.70787 au 
 T_jup = 4.613 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.240333679453833E-16 -1.724503765335183E-16 1.445826903751861E-14 7.379140414399609E-15 6.133005297106313E-15 6.336333926055614E-16
q -1.724503765335183E-16 2.398042429764092E-16 -2.010209116662687E-14 -1.039281561708789E-14 -8.558892278245267E-15 -8.776973847532046E-16
tp 1.445826903751861E-14 -2.010209116662687E-14 1.442968013218047E-11 6.397330744670311E-13 8.547475172467667E-12 6.999904985274024E-13
node 7.379140414399609E-15 -1.039281561708789E-14 6.397330744670311E-13 3.971841643307907E-12 -2.748491236219268E-12 -1.184298646447024E-12
peri 6.133005297106313E-15 -8.558892278245267E-15 8.547475172467667E-12 -2.748491236219268E-12 8.910677243125832E-12 1.866459204790955E-12
i 6.336333926055614E-16 -8.776973847532046E-16 6.999904985274024E-13 -1.184298646447024E-12 1.866459204790955E-12 1.063452181711044E-12

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 15.19   n/a E2020-QM5  
diameter diameter 1.5 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 5.7103 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z. (1987) Icarus 70, 566-572.]
[Wisniewski, W.Z. (1991) Icarus 90, 117-122.]
[Velichko, F.P.; Krugly, Yu.N.; Chiornij, V.G. (1992) Astron. Tsirk. 1553, 37-38.]
[De Sanctis, M.C.; Barucci, M.A.; Angeli, C.A.; Fulchignoni, M.; et al. (1994) Planet. Space Sci. 42, 859-864.]
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Durech, J.; Vokrouhlicky, D.; Baransky, A.R.; Breiter, S.; et al. (2012) Astron. Astrophys. 547, A10.]
[Warner, Brian D. (2014) Minor Planet Bull. 41, 213-224.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 311-319.]
[Vaduvescu, O.; Aznar, A.M.; Tudor, V.; Predatu, M.; et al. (2017) Earth, Moon, and Planets 120, 41-100.]
[Warner, B.D.; Stephens, R.D (2017) Minor Planet Bull. 44, 220-222.]
[Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46, 423-438.]
geometric albedo albedo 0.64   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.732   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=44.97 deg.
U-B UB 0.235   0.039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=44.97 deg.
SMASSII spectral type spec_B Xe   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)

3103 Eger (1982 BB)          Discovered 1982-Jan-20 by Lovas, M. at Piszkesteto
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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