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4905 Hiromi (1991 JM1)
Classification: Main-belt Asteroid          SPK-ID: 2004905
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1696593552005567 4.0681e-08  
a 2.599832685048582 1.1366e-08 au
q 2.158746748073908 1.0695e-07 au
i 12.42746230671968 4.5318e-06 deg
node 198.40337898826 1.4694e-05 deg
peri 176.155495805701 1.7394e-05 deg
M 215.0633749961751 1.0612e-05 deg
tp 2459616.941926896326
(2022-Feb-06.44192690)
4.6813e-05 TDB
period 1531.145724393824
4.19
1.0041e-05
2.749e-08
d
yr
n .235118051968909 1.5418e-09 deg/d
Q 3.040918622023256 1.3294e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2678  
   data-arc span      40883 days (111.93 yr)  
   first obs. used      1908-10-01  
   last obs. used      2020-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4075  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:47:43  

Additional Information
 Earth MOID = 1.16015 au 
 Jupiter MOID = 2.42357 au 
 T_jup = 3.362 
[ 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 12.3   n/a MPO473834  
diameter diameter 8.374 km 0.600 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.0428 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2013) http://www.asu.cas.cz/~ppravec/neo.htm]
[Skiff, B.A. (2013) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Polishook, D. (2014) Minor Planet Bull. 41, 49-53.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.212   0.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4905 Hiromi (1991 JM1)          Discovered 1991-May-15 by Takahashi and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991 JM1 = 1929 SB = 1950 TE4 = 1971 TV = 1974 HA3 = 1978 GG4 = 1978 JV3 = 1988 VU4 = A908 SF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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