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2430 Bruce Helin (1977 VC)
Classification: Main-belt Asteroid          SPK-ID: 2002430
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2144398603688265 2.8446e-08  
a 2.362657647988375 8.6978e-09 au
q 1.856009671854408 6.7465e-08 au
i 23.44983071753136 7.2795e-07 deg
node 45.82787228207008 3.7642e-06 deg
peri 309.6633916719807 6.4196e-06 deg
M 347.8396591252674 9.0069e-06 deg
tp 2459245.306690751310
(2021-Jan-30.80669075)
3.3329e-05 TDB
period 1326.476686520202
3.63
7.3249e-06
2.005e-08
d
yr
n .2713956480791247 1.4987e-09 deg/d
Q 2.869305624122342 1.0563e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2282  
   data-arc span      16314 days (44.67 yr)  
   first obs. used      1976-05-02  
   last obs. used      2020-12-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39382  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:46:30  

Additional Information
 Earth MOID = .919146 au 
 Jupiter MOID = 2.72417 au 
 T_jup = 3.410 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.95   n/a E2021B10  
diameter diameter 12.467 km 0.318 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 128. 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2006) http://www.asu.cas.cz/~ppravec/neo.htm]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.238   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.815   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.62, mean=3.85, max.=4.08) deg.
U-B UB 0.415   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.62, mean=3.85, max.=4.08) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Sl   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)

2430 Bruce Helin (1977 VC)          Discovered 1977-Nov-08 by Helin, E. F. and Shoemaker, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1977 VC = 1976 JU1 = A908 WC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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