+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7816 Hanoi (1987 YA) Classification: Mars-crossing Asteroid          SPK-ID: 2007816 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2951920177900683 3.9785e-08   a 2.313229836248239 4.7202e-09 au q 1.630382853273932 9.2255e-08 au i 2.386444978203675 3.6782e-06 deg node 222.9544386320435 7.2583e-05 deg peri 170.892759695719 7.29e-05 deg M 159.9993565765703 5.812e-06 deg tp 2458629.360311761128 (2019-May-25.86031176) 1.9977e-05 TDB period 1285.069466311234 3.52 3.9333e-06 1.077e-08 d yr n .2801404977999927 8.5745e-10 deg/d Q 2.996076819222546 6.1136e-09 au   Orbit Determination Parameters    # obs. used (total)      1322      data-arc span      12109 days (33.15 yr)      first obs. used      1987-12-18      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51543      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 20:03:42   Additional Information  Earth MOID = .635797 au   Jupiter MOID = 2.44481 au   T_jup = 3.522  [ 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 15.05   n/a E2021B10   rotation period rot_per 5.17 h n/a LCDB (Rev. 2020-October); 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.arc Last Updated: 2010-06-11 Alternate Designations  1987 YA = 1994 VB1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-15 03:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin