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4949 Akasofu (1988 WE)
Classification: Main-belt Asteroid          SPK-ID: 2004949
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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1685556625661588 1.5917e-08  
a 2.27208439826235 6.0997e-09 au
q 1.889111707107008 3.713e-08 au
i 4.813276227399609 7.6123e-07 deg
node 108.6406648485914 5.1058e-06 deg
peri 275.7675062389021 7.0365e-06 deg
M 148.2080939957324 5.3437e-06 deg
tp 2458685.503191656055
(2019-Jul-21.00319166)
1.785e-05 TDB
period 1250.936072419625
3.42
5.0374e-06
1.379e-08
d
yr
n .2877844903006669 1.1589e-09 deg/d
Q 2.655057089417693 7.1278e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2339  
   data-arc span      15431 days (42.25 yr)  
   first obs. used      1978-12-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44676  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:57:41  

Additional Information
 Earth MOID = .898902 au 
 Jupiter MOID = 2.80497 au 
 T_jup = 3.588 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.47   n/a E2021B10  
diameter diameter 4.460 km 0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.6798 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Higgins, D.J.; Pravec, P.; Kusnirak, P.; Masi, G.; et al. (2006) Minor Planet Bull. 33, 8-10.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.322   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4949 Akasofu           Discovered 1988 Nov. 29 by T. Kojima at Chiyoda.
Syun-Ichi Akasofu (b. 1930), born in Japan, has been professor of geophysics since 1964 at the University of Fairbanks, Alaska, where he served as director of the International Arctic Research Center (1998-2007) and his auroral work received national and international recognition.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100330/MPCPages.arcLast Updated: 2010-04-05

Alternate Designations
 1988 WE = 1978 YE = 1981 RL5 = 1981 SV6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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