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2501 Lohja (1942 GD)
Classification: Main-belt Asteroid          SPK-ID: 2002501
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1960407134666374 2.8378e-08  
a 2.422186649089829 7.4935e-09 au
q 1.947339450252895 6.8367e-08 au
i 3.302099235749678 3.4421e-06 deg
node 10.91184187889535 5.8167e-05 deg
peri 229.6532714878195 5.9003e-05 deg
M 239.0520372013716 1.214e-05 deg
tp 2459463.100281568700
(2021-Sep-05.60028157)
4.7611e-05 TDB
period 1376.923575323093
3.77
6.3896e-06
1.749e-08
d
yr
n .2614524193294653 1.2133e-09 deg/d
Q 2.897033847926763 8.9625e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3275  
   data-arc span      28695 days (78.56 yr)  
   first obs. used      1942-04-14  
   last obs. used      2020-11-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42827  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:06:40  

Additional Information
 Earth MOID = .936982 au 
 Jupiter MOID = 2.1251 au 
 T_jup = 3.484 
[ 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 11.9   n/a MPO502177  
diameter diameter 10.218 km 0.772 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.8084 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Higgins, D.; Pravec, P.; Kusnirak, P.; Galad, A.; et al. (2006) Minor Planet Bull. 33, 89-91.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2006) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pravec, P.; Wolf, M.; Sarounova, L. (2010) http://www.asu.cas.cz/~ppravec/neo.htm]
[Higgins, D.; Oey, J.; Pravec, P. (2011) Minor Planet Bull. 38, 46-49.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm]
[Husarik, M. (2014) ACM 2014 Abstracts, 246.]
[Li, B.; Zhao, H.; Lu, Hao; H.; Xianming L. (2015) Minor Planet Bull. 42, 190.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Franco, L.; Baj, G.; Tinella, V.; Bachini, M.; et al. (2017) Minor Planet Bull. 44, 311-312.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Husarik, M. (2018) Contrib. Astron. Obs. Skalnate Pleso 48, 319-328. ArXiv:1803:00238v1.]
geometric albedo albedo 0.281   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 1.059   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.89 deg.
U-B UB 0.580   0.047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.89 deg.
Tholen spectral type spec_T A   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B A   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)

2501 Lohja (1942 GD)          Discovered 1942-Apr-14 by Oterma, L. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1942 GD = 1931 MD = 1935 OG = 1938 DX = 1953 EW1 = 1957 FC = 1969 PU = 1972 GE2 = 1973 SZ5 = 1974 YF = 1976 JS8 = 1979 BQ = 1981 UF = 3110 T-3 = A912 JD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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