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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1760558765808669 1.6767e-08  
a 3.132300664723227 1.0119e-08 au
q 2.580840725480547 5.428e-08 au
i 1.778392351065967 1.0241e-06 deg
node 161.7022877837178 1.5571e-05 deg
peri 139.3423152486386 1.6953e-05 deg
M 344.0957073438843 5.0099e-06 deg
tp 2459289.955170680830
(2021-Mar-16.45517068)
2.8266e-05 TDB
period 2024.853424255581
5.54
9.8118e-06
2.686e-08
d
yr
n .1777906468130406 8.6152e-10 deg/d
Q 3.683760603965907 1.19e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3698  
   data-arc span      41954 days (114.86 yr)  
   first obs. used      1905-11-20  
   last obs. used      2020-10-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44995  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:12:02  

Additional Information
 Earth MOID = 1.56368 au 
 Jupiter MOID = 1.5531 au 
 T_jup = 3.188 
[ 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 10.66   n/a E2021B10 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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