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18 Melpomene (A852 MA)
Classification: Main-belt Asteroid          SPK-ID: 2000018
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 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2175053316026563 2.9389e-08  
a 2.295708700601071 2.295e-09 au
q 1.796379818413732 6.7281e-08 au
i 10.13158956795152 3.5689e-06 deg
node 150.3651823248487 1.9153e-05 deg
peri 228.0776863471598 2.083e-05 deg
M 20.46210219604495 9.5212e-06 deg
tp 2458928.286009292591
(2020-Mar-19.78600929)
3.3548e-05 TDB
period 1270.496863205588
3.48
1.9051e-06
5.216e-09
d
yr
n .2833537102104169 4.249e-10 deg/d
Q 2.79503758278841 2.7942e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5098  
   data-arc span      61111 days (167.31 yr)  
   first obs. used      1852-06-29  
   last obs. used      2019-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42644  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:14:02  

Additional Information
 Earth MOID = .813814 au 
 Jupiter MOID = 2.69803 au 
 T_jup = 3.543 
[ hide covariance matrix ]
Orbital Elements at Epoch 2450442.5 (1996-Dec-25.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2176409323811318 2.9307e-08  
q 1.796226346376139 6.7107e-08 au
tp 2450034.159567958999
(1995-Nov-12.65956796)
2.9444e-05 TDB
node 150.5883669149758 1.915e-05 deg
peri 227.7847139430649 2.084e-05 deg
i 10.12960997490127 3.5701e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      5098  
   data-arc span      61111 days (167.31 yr)  
   first obs. used      1852-06-29  
   last obs. used      2019-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42644  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:14:02  

Additional Information
 Jupiter MOID = 2.69803 au 
 T_jup = 3.543 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.588838523534387E-16 -1.965965678929366E-15 -5.490670757682678E-14 4.054505042935249E-15 -2.168976678443855E-14 8.303057701622279E-16
q -1.965965678929366E-15 4.503297010181762E-15 1.304375840747269E-13 -9.134460525929894E-15 5.059455451982703E-14 -1.857286353572105E-15
tp -5.490670757682678E-14 1.304375840747269E-13 8.669641141032564E-10 -6.305550095385844E-12 2.526456580831865E-10 -5.245776248986847E-14
node 4.054505042935249E-15 -9.134460525929894E-15 -6.305550095385844E-12 3.667402262653809E-10 -3.62231631269204E-10 -2.946644939252802E-12
peri -2.168976678443855E-14 5.059455451982703E-14 2.526456580831865E-10 -3.62231631269204E-10 4.343012467332218E-10 2.919636452093384E-12
i 8.303057701622279E-16 -1.857286353572105E-15 -5.245776248986847E-14 -2.946644939252802E-12 2.919636452093384E-12 1.274575146673503E-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 6.6   n/a MPO492748 IRAS observations used: 15
magnitude slope G 0.25   n/a PDS3 (MPC 17257) Fit
diameter diameter 139.594 km 2.452 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.570 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Binzel, R.P.; Harris, A.W. (1980) Icarus 42, 43-45.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Hoffmann, M.; Geyer, E.H. (1990) in Asteroids, Comets, Meteors III. C.-I. Lagerkvist, H. Rickman, B.A. Lindblad, M. Lindgren, eds. Uppsala, p. 111-114.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2013) Minor Planet Bull. 40, 33.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 155-156.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.181   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.854   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=2.60, mean=19.31, max.=27.48) deg.
U-B UB 0.425   0.041 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=2.60, mean=18.73, max.=27.48) 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)

18 Melpomene (A852 MA)          Discovered 1852-Jun-24 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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