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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1848283864033181 2.8636e-08  
a 2.465447641391389 6.4884e-09 au
q 2.009762932071152 7.005e-08 au
i 2.614824772587173 3.2753e-06 deg
node 186.2151605949608 5.8447e-05 deg
peri 177.6660938849508 5.8943e-05 deg
M 352.9410757013664 7.4146e-06 deg
tp 2459028.225419525167
(2020-Jun-27.72541953)
2.9144e-05 TDB
period 1413.976210368523
3.87
5.5818e-06
1.528e-08
d
yr
n .2546011717595826 1.0051e-09 deg/d
Q 2.921132350711626 7.6876e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2965  
   data-arc span      24151 days (66.12 yr)  
   first obs. used      1954-10-03  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44465  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:06:53  

Additional Information
 Earth MOID = 1.00756 au 
 Jupiter MOID = 2.53828 au 
 T_jup = 3.462 
[ 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 13.2   n/a MPO279540  
diameter diameter 13.114 km 3.581 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 6.1025 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2008) http://www.asu.cas.cz/~ppravec/neo.htm]
[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) Ap. J. Supp. Ser. 241, A6.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.050   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
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

[ show close-approach data ]
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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