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2527 Gregory (1981 RE)
Classification: Main-belt Asteroid          SPK-ID: 2002527
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1848283741364412 3.0948e-08  
a 2.465447645302094 7.5389e-09 au
q 2.009762965502391 7.7019e-08 au
i 2.614826316832751 3.3837e-06 deg
node 186.2151101516496 6.2541e-05 deg
peri 177.6661447707948 6.3006e-05 deg
M 352.9410731840291 7.9079e-06 deg
tp 2459028.225429478510
3.1102e-05 TDB
period 1413.976213732808
n .2546011711538081 1.1678e-09 deg/d
Q 2.921132325101798 8.9323e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2589  
   data-arc span      23726 days (64.96 yr)  
   first obs. used      1954-10-03  
   last obs. used      2019-09-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46649  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:24:04  

Additional Information
 Earth MOID = 1.00756 au 
 Jupiter MOID = 2.53828 au 
 T_jup = 3.462 
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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 13.2   n/a MPO279540  
diameter diameter 13.114 km 3.581 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 6.1025 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2008)]
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) ArXiv:1901.08719.]
geometric albedo albedo 0.050   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B B   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)

2527 Gregory (1981 RE)          Discovered 1981-Sep-03 by Thomas, N. G. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 RE = 1950 RE1 = 1954 TA = 1954 UT = 1962 WU1 = 1977 RK1 = 1980 KC = 1981 TR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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