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1247 Memoria (1932 QA)
Classification: Main-belt Asteroid          SPK-ID: 2001247
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1765336633426511 1.6541e-08  
a 3.133968388610683 1.0263e-08 au
q 2.580717468169174 5.3501e-08 au
i 1.779835098528363 1.0242e-06 deg
node 161.6690735586435 1.5494e-05 deg
peri 139.1850451673925 1.6892e-05 deg
M 19.05866688331625 5.0273e-06 deg
tp 2459289.217135031560
(2021-Mar-15.71713503)
2.8187e-05 TDB
period 2026.470771806578
5.55
9.9543e-06
2.725e-08
d
yr
n .1776487502353975 8.7263e-10 deg/d
Q 3.687219309052193 1.2075e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3893  
   data-arc span      42265 days (115.72 yr)  
   first obs. used      1905-11-20  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44167  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:28:54  

Additional Information
 Earth MOID = 1.56504 au 
 Jupiter MOID = 1.5481 au 
 T_jup = 3.187 
[ 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 10.67   n/a MPO636080 IRAS observations used: 5
diameter diameter 38.906 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 18.79 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Polakis, T. (2020) Minor Planet Bull. 47, 314-321.]
geometric albedo albedo 0.078   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.680   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.04, mean=3.26, max.=5.49) deg.
U-B UB 0.290   0.071 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.04, mean=3.26, max.=5.49) deg.
Tholen spectral type spec_T CXF   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

1247 Memoria (1932 QA)          Discovered 1932-Aug-30 by Laugier, M. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1932 QA = 1927 UL = 1931 JU = 1936 FN = A905 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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