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124 Alkeste (A872 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000124
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 134 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07553163584454063 2.8459e-08  
a 2.629800237596277 4.8359e-09 au
q 2.431167123706269 7.6222e-08 au
i 2.957553578489393 4.8467e-07 deg
node 187.9742035518865 4.7387e-06 deg
peri 62.24441635569459 1.1156e-05 deg
M 352.6037054425752 1.0057e-05 deg
tp 2459232.503263338717
(2021-Jan-18.00326334)
4.3531e-05 TDB
period 1557.695507187782
4.26
4.2967e-06
1.176e-08
d
yr
n .2311106364105354 6.3748e-10 deg/d
Q 2.828433351486285 5.2012e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3622  
   data-arc span      54266 days (148.57 yr)  
   first obs. used      1872-08-24  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49241  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:53:37  

Additional Information
 Earth MOID = 1.41728 au 
 Jupiter MOID = 2.18099 au 
 T_jup = 3.395 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457337.5 (2015-Nov-11.0) TDB
Reference: JPL 134 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07599809612947409 2.8438e-08  
q 2.431710083790355 7.6321e-08 au
tp 2457669.744817028574
(2016-Oct-08.24481703)
4.2049e-05 TDB
node 187.9924152879643 4.7411e-06 deg
peri 61.17255939920361 1.1036e-05 deg
i 2.955663974659542 4.8453e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3622  
   data-arc span      54266 days (148.57 yr)  
   first obs. used      1872-08-24  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49241  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:53:37  

Additional Information
 Jupiter MOID = 2.18099 au 
 T_jup = 3.395 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.08724968600587E-16 -2.166953487610597E-15 -4.863641902557034E-13 -7.670115061809808E-15 -4.071598113714038E-14 -1.341026502270249E-15
q -2.166953487610597E-15 5.824895937411046E-15 1.294039172846875E-12 1.932041035400363E-14 1.064956208018028E-13 3.617975099383921E-15
tp -4.863641902557034E-13 1.294039172846875E-12 1.768088324739794E-9 -2.783239393392913E-11 4.078923215216688E-10 -1.255615551918832E-13
node -7.670115061809808E-15 1.932041035400363E-14 -2.783239393392913E-11 2.247806872167954E-11 -2.845258388011953E-11 2.131080657740591E-13
peri -4.071598113714038E-14 1.064956208018028E-13 4.078923215216688E-10 -2.845258388011953E-11 1.217931795430968E-10 -3.866756931072687E-13
i -1.341026502270249E-15 3.617975099383921E-15 -1.255615551918832E-13 2.131080657740591E-13 -3.866756931072687E-13 2.347729607671662E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.13   n/a E2021B10 IRAS observations used: 12
magnitude slope G 0.19   n/a PDS3 (MPC 17257) Fit
diameter diameter 88.648 km 1.651 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.906 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Shevchenko, V.G.; Bel'skaya, I.N.; Krugly, Yu.N.; Chiorny, V.G.; Gaftonyuk, N.M. (2002) Icarus 155, 365-374.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2016) Minor Planet Bull. 43, 296-299.]
geometric albedo albedo 0.128   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.844   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=4.53, mean=15.83, max.=22.07) deg.
U-B UB 0.424   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=4.53, mean=14.22, max.=20.37) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   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)

124 Alkeste (A872 QA)          Discovered 1872-Aug-23 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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