7816 Hanoi

7816 Hanoi
Discovery [1]
Discovered by M. Koishikawa
Discovery site Ayashi Station – Sendai Astronomical Observatory
Discovery date 18 December 1987
Designations
MPC designation 7816 Hanoi
Named after
 Hanoi (Vietnamese capital)[2]
1987 YA · 1994 VB1
Mars-crosser[1][3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 28.17 yr (10,288 days)
Aphelion 2.9950 AU
Perihelion 1.6328 AU
2.3139 AU
Eccentricity 0.2943
3.52 yr (1,286 days)
16.605°
Inclination 2.3787°
223.04°
170.42°
Earth MOID 0.6377 AU
Physical characteristics
Dimensions 2.97 km (calculated)[3]
5.17±0.01 h[4]
5.18±0.02 h[5]
0.20 (assumed)[3]
S [3]
15.0[1][3]
15.18±0.30[6]

    7816 Hanoi, provisional designation 1987 YA, is a stony asteroid and Mars-crosser from the inner regions of the asteroid belt, about 3 kilometers in diameter. It was discovered by Japanese astronomer Masahiro Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory, Japan, on 18 December 1987.[7]

    The S-type asteroid orbits the Sun at a distance of 1.6–3.0 AU once every 3 years and 6 months (1,286 days). Its orbit has a high eccentricity of 0.29 and an inclination of 2° with respect to the ecliptic.[1] In November 2011, a photometric light-curve analysis by Brian Warner at the U.S. Palmer Divide Observatory, Colorado, gave a rotation period of 5.18±0.02 hours with a brightness amplitude of 0.72 in magnitude (U=2+).[5] Ten years later, a remeasurement of the original images rendered a slightly refined period of 5.17±0.01 and an amplitude of 0.77 (U=3-).[4] The Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20, and calculates a diameter of 3.0 kilometers, based on an absolute magnitude of 15.0.[3]

    The minor planet was named for the capital of Vietnam, Hanoi, the city which the discoverer visited in 1997 with astronomer Yoshihide Kozai, after whom the minor planet 3040 Kozai is named, to help Vietnamese astronomers install a 0.40-meter Schmidt-Cassegrain telescope with a CCD camera and a 0.10-meter refractor at HNUE. The equipment, installed at the National Pedagogical University, was obtained using funds from the Japanese Sumitomo Foundations, in an effort to promote astronomical research in Vietnam.[2]

    See also

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 7816 Hanoi (1987 YA)" (2016-02-17 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (7816) Hanoi. Springer Berlin Heidelberg. p. 617. ISBN 978-3-540-00238-3. Retrieved March 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (7816) Hanoi". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
    4. 1 2 Warner, Brian D. (January 2011). "Upon Further Review: V. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin 38 (1): 63–65. Bibcode:2011MPBu...38...63W. ISSN 1052-8091. Retrieved March 2016.
    5. 1 2 Warner, B. D. (June 2002). "Asteroid Photometry at the Palmer Divide Observatory: Results for 620 Drakonia, 3447 Burkhalter, and 7816 Hanoi". The Minor Planet Bulletin 29: 27–28. Bibcode:2002MPBu...29...27W. Retrieved March 2016.
    6. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved March 2016.
    7. ↑ "7816 Hanoi (1987 YA)". Minor Planet Center. Retrieved March 2016.

    External links


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