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3611 Dabu (1981 YY1)
Classification: Main-belt Asteroid          SPK-ID: 2003611
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2153475951742325 1.9708e-08  
a 2.784985129642573 1.0137e-08 au
q 2.185245279378047 5.6516e-08 au
i 8.494685705486415 1.0783e-06 deg
node 135.6684384095294 7.2686e-06 deg
peri 290.9437910451157 8.278e-06 deg
M 154.6975574544621 4.7075e-06 deg
tp 2458471.019472252377
(2018-Dec-18.51947225)
2.0348e-05 TDB
period 1697.589763603405
4.65
9.2683e-06
2.538e-08
d
yr
n .2120653692184398 1.1578e-09 deg/d
Q 3.3847249799071 1.232e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2302  
   data-arc span      18051 days (49.42 yr)  
   first obs. used      1971-09-16  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44139  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:19:36  

Additional Information
 Earth MOID = 1.21573 au 
 Jupiter MOID = 1.9849 au 
 T_jup = 3.282 
[ 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 13.02   n/a E2021B10  
diameter diameter 14.044 km 0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 31.9351 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:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.044   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Ch   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)

3611 Dabu (1981 YY1)          Discovered 1981-Dec-20 by Purple Mountain Observatory at Nanking
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 YY1 = 1971 SQ = 1982 BJ8 = 1985 QG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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