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2100 Ra-Shalom (1978 RA)
Classification: Aten [NEO]          SPK-ID: 2002100
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 269 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4365426444514425 1.5499e-08  
a .8320476102381541 6.6087e-10 au
q .4688233461552873 1.2887e-08 au
i 15.75298265231449 7.4673e-07 deg
node 170.8036962680194 4.9414e-06 deg
peri 356.0511814841616 2.6958e-06 deg
M 171.7620973925118 9.8124e-06 deg
tp 2458868.234820056027
(2020-Jan-19.73482006)
7.5087e-06 TDB
period 277.2175322883897
0.76
3.3028e-07
9.043e-10
d
yr
n 1.298619163904437 1.5472e-09 deg/d
Q 1.195271874321021 9.4937e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.397288661453602E-15 9.49E-16
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      1988  
   # delay obs. used      8  
   # Doppler obs. used      2  
   data-arc span      16407 days (44.92 yr)  
   first obs. used      1975-10-03  
   last obs. used      2020-09-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35917  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-06 06:28:02  

Additional Information
 Earth MOID = .150184 au 
 Jupiter MOID = 3.77658 au 
 T_jup = 6.946 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ show covariance matrix ]

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 16.3   n/a MPO502173  
magnitude slope G 0.12   n/a PDS3 (MPC 17264) Fit
diameter diameter 2.3 km 0.2 Shepard et al., Icarus 193 (2008) 20-38  
rotation period rot_per 19.797 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Ostro, S.J.; Harris, A.W.; Campbell, D.B.; Shapiro, I.I.; Young, J. (1984) Icarus 60, 391-403.]
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2003) http://www.asu.cas.cz/~ppravec/neo.htm]
[Kaasalainen, M.; et al. (2004) Icarus 167, 178-196.]
[Shepard, M.K.; Clark, B.E.; Nolan, M.C.; Benner, L.A.M.; et al. (2008) Icarus 193, 20-38.]
[Durech, J.; Vokrouhlicky, D.; Baransky, A.R.; Breiter, S.; et al. (2012) Astron. Astrophys. 547, A10.]
[Warner, B.D. (2017) Minor Planet Bull. 44, 22-36.]
geometric albedo albedo 0.13   0.03 Shepard et al., Icarus 193 (2008) 20-38  
B-V BV 0.712   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=27.41, mean=27.52, max.=27.63) deg.
U-B UB 0.310   0.053 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=27.41, mean=27.52, max.=27.63) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   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)

2100 Ra-Shalom (1978 RA)          Discovered 1978-Sep-10 by Helin, E. F. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1978 RA = 1975 TB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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