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7816 Hanoi (1987 YA)
Classification: Mars-crossing Asteroid          SPK-ID: 2007816
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2948836501320763 5.1376e-08  
a 2.313654104787949 5.2762e-09 au
q 1.631395337225017 1.2011e-07 au
i 2.386198069617414 4.8277e-06 deg
node 222.966644337945 7.4571e-05 deg
peri 170.9341556259425 7.4902e-05 deg
M 351.9178962777933 5.7159e-06 deg
tp 2458629.358117232817
2.0453e-05 TDB
period 1285.423023620575
n .2800634447841219 9.5801e-10 deg/d
Q 2.995912872350881 6.832e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1101  
   data-arc span      11668 days (31.95 yr)  
   first obs. used      1987-12-18  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5493  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 21:49:09  

Additional Information
 Earth MOID = .637294 au 
 Jupiter MOID = 2.4414 au 
 T_jup = 3.522 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO347588  
rotation period rot_per 5.17 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2002) Minor Planet Bull. 29, 27-28.]
[Warner, B.D. (2011) Minor Planet Bull. 38, 63-65.]

7816 Hanoi           Discovered 1987 Dec. 18 by M. Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory.
Named for the capital of Vietnam. The discoverer visited the city in 1997 with Yoshihide Kozai to help Vietnamese astronomers install a 0.40-m Schmidt Cassegrain telescope with a CCD camera and a 0.10-m refractor. The equipment, installed at the National Pedagogical University, was obtained using funds from the Sumitomo Foundations, Japan, with the hope that astronomical research in Vietnam will thereby be promoted.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990202/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1987 YA = 1994 VB1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2019-Dec-06 18:27 UT
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