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JPL Small-Body Database Browser
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1025 Riema (A923 PG)
Classification: Inner Main-belt Asteroid          SPK-ID: 2001025
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03915684971365928 3.9595e-08  
a 1.979193514285928 4.0966e-09 au
q 1.901694531292784 7.8125e-08 au
i 26.86206699710835 4.6659e-06 deg
node 163.3749125327683 7.6167e-06 deg
peri 349.1472241401062 4.8797e-05 deg
M 96.2493053643515 4.8919e-05 deg
tp 2458728.589537448214
(2019-Sep-02.08953745)
0.00013812 TDB
period 1017.023095887177
2.78
3.1576e-06
8.645e-09
d
yr
n .3539742621930944 1.099e-09 deg/d
Q 2.056692497279071 4.257e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2382  
   data-arc span      35323 days (96.71 yr)  
   first obs. used      1923-08-13  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39283  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:17:37  

Additional Information
 Earth MOID = .911197 au 
 Jupiter MOID = 2.92157 au 
 T_jup = 3.729 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456429.5 (2013-May-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03948799927008792 3.9581e-08  
q 1.900983908868352 7.8198e-08 au
tp 2456694.426495300832
(2014-Feb-05.92649530)
0.00013661 TDB
node 163.4165372199405 7.6159e-06 deg
peri 349.0311143923694 4.8426e-05 deg
i 26.86144131522904 4.6663e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2382  
   data-arc span      35323 days (96.71 yr)  
   first obs. used      1923-08-13  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39283  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:17:37  

Additional Information
 Jupiter MOID = 2.92157 au 
 T_jup = 3.729 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.566665332800404E-15 -3.09121264870587E-15 2.22121409586843E-12 7.29493610062038E-15 7.57285409149145E-13 -1.743637526512873E-15
q -3.09121264870587E-15 6.114891668250701E-15 -4.373282452116985E-12 -1.423466967046894E-14 -1.493749679409936E-12 3.601081054412727E-15
tp 2.22121409586843E-12 -4.373282452116985E-12 1.866189966901156E-8 1.670837926394239E-11 6.540005823076866E-9 -1.386338187161686E-11
node 7.29493610062038E-15 -1.423466967046894E-14 1.670837926394239E-11 5.80016902416758E-11 -4.5314242469704E-11 1.080177269605601E-11
peri 7.57285409149145E-13 -1.493749679409936E-12 6.540005823076866E-9 -4.5314242469704E-11 2.345043952530928E-9 -1.459952713366021E-11
i -1.743637526512873E-15 3.601081054412727E-15 -1.386338187161686E-11 1.080177269605601E-11 -1.459952713366021E-11 2.177469832277119E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.5   n/a MPO467621  
diameter diameter 4.605 km 0.171 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.588 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2003) Minor Planet Bull. 30, 69-70.]
[Warner, B.D. (2009) Minor Planet Bull. 36, 172-176.]
[Warner, B.D. (2013). Minor Planet Bull. 40, 26-29.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 144-155.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 57-65.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2017) Minor Planet Bull. 44, 213-219.]
[Tan, H.; Yeh, T.; Li, B.; Gao, X. (2018) Minor Planet Bull. 45, 57-59.]
geometric albedo albedo 1.000   0.000 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.714   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=28.96 deg.
U-B UB 0.294   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=28.96 deg.
Tholen spectral type spec_T E   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xe   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)

1025 Riema (A923 PG)          Discovered 1923-Aug-12 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A923 PG = A923 QA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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