1658 Innes

1658 Innes
Discovery [1]
Discovered by J. A. Bruwer
Discovery site Johannesburg Obs.
Discovery date 13 July 1953
Designations
MPC designation 1658 Innes
Named after
 Robert T. A. Innes
(astronomer)[2]
1953 NA · 1940 GB
1948 EM · 1949 QA
1953 OF · 1953 PN
1957 OE
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 75.92 yr (27730 days)
Aphelion 3.0301 AU (453.30 Gm)
Perihelion 2.0874 AU (312.27 Gm)
2.5587 AU (382.78 Gm)
Eccentricity 0.18422
4.09 yr (1495.0 d)
102.63°
0° 14m 26.916s / day
Inclination 9.0932°
95.446°
188.86°
Earth MOID 1.06977 AU (160.035 Gm)
Jupiter MOID 2.11749 AU (316.772 Gm)
Jupiter Tisserand parameter 3.395
Physical characteristics
Dimensions 14.76 km (calculated)[3]
3.191 h (0.1330 d)[1][4][5]
0.20 (assumed)[3]
B–V = 0.960
U–B = 0.610
Tholen = AS
A [3]
11.52

    1658 Innes, provisional designation 1953 NA, is an asteroid from the inner regions of the asteroid belt, about 15 kilometers in diameter. It was discovered on 13 July 1953 by South African astronomer Jacobus Albertus Bruwer at Union Observatory in Johannesburg.[6]

    The spectral type of the asteroid is that of a rare A-type.[7] It orbits the Sun at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,495 days). Its orbit shows an eccentricity of 0.18 and is tilted by 9 degrees to the plane of the ecliptic. Light-curve observations carried out in May 2014 gave it a rotation period of 3.2 hours.[4][5] The body has an assumed geometric albedo of 0.20.[3]

    The asteroid was named after the Scottish–South African astronomer Robert T. A. Innes (1861–1933), first director of the discovering Union Observatory from 1903 to 1927 (originally named Transvaal Observatory). He was a skilled observational astronomer, famous for his deliberate search and discovery of the nearest star, Proxima Centauri, in 1915. He also made important theoretical and computational contributions to celestial mechanics and to the irregular rotation of the Earth. The astronomer is also honored by the lunar crater Innes.[2]

    1658 Innes was the first numbered discovery of astronomer Jacobus Bruwer. In addition, he also discovered the minor planets 1660 Wood, 1794 Finsen, and 3284 Niebuhr. The asteroid 1811 Bruwer was named in his honour by the Dutch, Dutch-American astronomer trio of the Palomar–Leiden survey.[8]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 1658 Innes (1953 NA)" (2015-10-19 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1658) Innes. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-29925-7. Retrieved 12 November 2015.
    3. 1 2 3 4 5 "LCDB Data for (1658) Innes". Asteroid Lightcurve Database (LCDB). Retrieved 12 November 2015.
    4. 1 2 Franco, Lorenzo; Papini, Riccardo (October 2014). "Rotational Period for 1658 Innes, (10597) 1995 TR10, and 30017 Shaundatta". The Minor Planet Bulletin. 41 (4): 243–244. Bibcode:2014MPBu...41..243F. ISSN 1052-8091. Retrieved 12 November 2015.
    5. 1 2 Stephens, Robert D. (October 2014). "Asteroids Observed from CS3: 2014 April-June". The Minor Planet Bulletin. 41 (4): 226–230. Bibcode:2014MPBu...41..226S. ISSN 1052-8091. Retrieved 12 November 2015.
    6. ↑ "1658 Innes (1953 NA)". Minor Planet Center. Retrieved 12 November 2015.
    7. ↑ "JPL Small-Body Database Search Engine: spec. type = A (SMASSII)". JPL Solar System Dynamics. Retrieved 2015-06-14.
    8. ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1811) Bruwer. Springer Berlin Heidelberg. p. 145. ISBN 978-3-540-29925-7. Retrieved 12 November 2015.

    External links


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