175 Andromache

175 Andromache
Orbital diagram
Discovery
Discovered byJ. C. Watson
Discovery date1 October 1877
Designations
(175) Andromache
Pronunciation/ænˈdrɒməkiː/[1]
Named after
Andromache
A877 TA; 1893 KA;
1895 XB; 1946 MB;
1946 OD
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc138.18 yr (50472 d)
Aphelion3.9264 AU (587.38 Gm)
Perihelion2.4442 AU (365.65 Gm)
3.1853 AU (476.51 Gm)
Eccentricity0.23267
5.69 yr (2076.5 d)
35.697°
0° 10m 24.132s / day
Inclination3.2184°
21.353°
320.41°
Earth MOID1.43641 AU (214.884 Gm)
Jupiter MOID1.4787 AU (221.21 Gm)
TJupiter3.153
Physical characteristics
50.585±3.5 km[citation needed]
8.324 h (0.3468 d)
0.0819±0.013[citation needed]
C
8.06[3]
8.31[2]

175 Andromache is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on October 1, 1877, and named after Andromache, wife of Hector during the Trojan War. Watson's telegram to Europe announcing the discovery became lost, and so notification did not arrive until several weeks later. As a result, another minor planet, later designated 176 Iduna, was initially assigned the number 175.[4]

The initial orbital elements for 175 Andromache proved unreliable, and it was only in 1893 that an accurate ephemeris was produced. Because the orbital period is fairly close to being double that of the giant planet Jupiter, 175 Andromache initially became of interest in the study of gravitational perturbations.[4][5]

Based upon its spectrum, this is classified as a C-type asteroid.[6] It has a diameter estimated in the range 101–107 km with a roughly circular shape. The size ratio between the major and minor axes is 1.09 ± 0.09, as determined from the W. M. Keck Observatory. An earlier result published in 2000 gave a larger size ratio of 1.20.[7]

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b Cite error: The named reference JPL was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Warner2007 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Leuschner1936 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Leuschner1922 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Lazzarin1995 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Marchis2006 was invoked but never defined (see the help page).