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4181 Kivi (1938 DK1)
Classification: Main-belt Asteroid          SPK-ID: 2004181
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .133609045903923 1.7419e-08  
a 2.61014912108317 7.4178e-09 au
q 2.261409587348285 4.5807e-08 au
i 14.40088114171797 8.4332e-07 deg
node 151.8168360204318 3.2099e-06 deg
peri 338.9819692533634 5.7444e-06 deg
M 300.0879235408008 8.8398e-06 deg
tp 2459652.835217702113
(2022-Mar-14.33521770)
3.8484e-05 TDB
period 1540.268403743354
4.22
6.566e-06
1.798e-08
d
yr
n .2337254981827081 9.9634e-10 deg/d
Q 2.958888654818055 8.4089e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2754  
   data-arc span      30303 days (82.97 yr)  
   first obs. used      1938-02-22  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40906  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:17:36  

Additional Information
 Earth MOID = 1.28083 au 
 Jupiter MOID = 2.08133 au 
 T_jup = 3.353 
[ 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 12.56   n/a E2021B10  
diameter diameter 8.336 km 0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 178.2 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:
[Rowe, B. (2019) Minor Planet Bull. 46, 92-94.]
[Rowe, B. (2019) Minor Planet Bull. 46, 292.]
geometric albedo albedo 0.306   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4181 Kivi (1938 DK1)          Discovered 1938-Feb-24 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1938 DK1 = 1980 EK = 1988 BO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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