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1277 Dolores (1933 HA)
Classification: Main-belt Asteroid          SPK-ID: 2001277
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .237236861894535 3.2994e-08  
a 2.700888333765909 9.0043e-09 au
q 2.060138061135726 8.81e-08 au
i 6.967707853249353 3.8963e-06 deg
node 247.036321129867 3.3721e-05 deg
peri 47.15482060716037 3.4803e-05 deg
M 177.2578438465017 1.0349e-05 deg
tp 2458202.208818380492
4.4902e-05 TDB
period 1621.28128801954
n .2220466014504826 1.1104e-09 deg/d
Q 3.341638606396093 1.114e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2961  
   data-arc span      31641 days (86.63 yr)  
   first obs. used      1933-06-17  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42727  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:50:17  

Additional Information
 Earth MOID = 1.05157 au 
 Jupiter MOID = 1.88627 au 
 T_jup = 3.316 
[ 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 11.2   n/a MPO502165 IRAS observations used: 22
diameter diameter 32.587 km 0.802 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.676 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2018) Observatoire de Geneve web site,]
[Gocalves, R.M.D. (2019) Minor Planet Bull. 46, 95.]
geometric albedo albedo 0.063   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.730   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.35 deg.
U-B UB 0.378   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.35 deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Cb   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)

1277 Dolores (1933 HA)          Discovered 1933-Apr-18 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 HA = 1925 SE = 1929 NB = 1942 JA = 1951 PB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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