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2167 Erin (1971 LA)
Classification: Main-belt Asteroid          SPK-ID: 2002167
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1860997621404434 1.7433e-08  
a 2.542556288124137 8.5378e-09 au
q 2.069387167675546 4.3705e-08 au
i 6.017637945289346 1.3684e-06 deg
node 252.7514481102226 1.0399e-05 deg
peri 274.6265222462503 1.2101e-05 deg
M 184.8531859045839 6.8039e-06 deg
tp 2460116.950309856754
2.9618e-05 TDB
period 1480.826887362832
n .2431074172627397 1.2245e-09 deg/d
Q 3.015725408572727 1.0127e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3489  
   data-arc span      24655 days (67.50 yr)  
   first obs. used      1954-02-07  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3743  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:25:24  

Additional Information
 Earth MOID = 1.08729 au 
 Jupiter MOID = 2.01246 au 
 T_jup = 3.413 
[ 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 12.13   n/a E2021B10  
diameter diameter 8.998 km 0.365 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.7186 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Montigiani, N.; Benedetti, W.; Stecher, G.; Ford, L.; et al. (2008) Minor Planet Bull. 35, 107-108.]
[Stecher, G.; Ford, L.; Lorenzen, K.; Ulrich, S. (2008) Minor Planet Bull. 35, 76-77.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.379   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B S   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)

2167 Erin           Discovered 1971 June 1 at the Perth Observatory.
Named in honor of the daughter of George Punko, member of the astrometric team at the Perth Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 6530Last Updated: 2006-03-21

Alternate Designations
 1971 LA = 1938 EV = 1954 CH = 1973 WG = 1973 YF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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