_Erigone.png) 3D convex shape model of 163 Erigone | |
| Discovery | |
|---|---|
| Discovered by | J. Perrotin |
| Discovery site | Toulouse |
| Discovery date | 26 April 1876 |
| Designations | |
| (163) Erigone | |
| Pronunciation | /ɪˈrɪɡəniː/[1] |
Named after | Erigone |
| A876 HC; 1892 RA; 1957 OT;2017 YH23 | |
| Main belt (Erigone) | |
| Adjectives | Erigonian/ɛrɪˈɡoʊniən/[2] Erigonean/ɛrɪɡəˈniːən/ |
| Orbital characteristics[3] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.56 yr (45131 d) |
| Aphelion | 2.8188 AU (421.69 Gm) |
| Perihelion | 1.9161 AU (286.64 Gm) |
| 2.3675 AU (354.17 Gm) | |
| Eccentricity | 0.19064 |
| 3.64yr (1330.5d) | |
| 280.031° | |
| 0° 16m 14.052s / day | |
| Inclination | 4.8148° |
| 160.166° | |
| 298.260° | |
| Earth MOID | 0.93686 AU (140.152 Gm) |
| Jupiter MOID | 2.3628 AU (353.47 Gm) |
| TJupiter | 3.518 |
| Physical characteristics | |
| Dimensions | 72.63±5.7 km[3] 72.70 ± 1.95 km[4] |
| Mass | (2.01 ± 0.68) × 1018 kg[4] |
Meandensity | 9.99 ± 3.45 g/cm3[4] |
| 16.136 h (0.6723 d)[5] | |
| 0.0546±0.010[3] 0.0428 ± 0.0092[6] | |
| C[6] (Tholen) | |
| 9.47,[3] 9.48[6] | |
163 Erigone is anasteroid from theasteroid belt and the namesake of theErigone family of asteroids that share similarorbital elements and properties. It was discovered by French astronomerHenri Joseph Perrotin on April 26, 1876, and named after one of the twoErigones inGreek mythology. This asteroid is orbiting theSun at a distance of2.37 AU with aperiod of 3.643 years and aneccentricity (ovalness) of 0.19. Theorbital plane is inclined at an angle of 4.8° to theplane of the ecliptic.[3]
Photometric measurements taken in 2014 were used to construct alightcurve that demonstrated arotation period of16.136±0.001 h with anamplitude of0.32±0.02 in magnitude.[5] Erigone is a relatively large and dark asteroid with an estimated size of 73 km.[4] Based upon its spectrum, it is classified as aC-type asteroid,[6] which indicates that it probably has a carbonaceous composition. It is the largest member of the eponymously namedErigone collisional family.[7]
_Erigone_as_it_occults_Regulus_on_March_20%2c_2014.jpg)
In the early morning hours of March 20, 2014, Erigoneocculted thefirst-magnitude starRegulus,[8] as first predicted by Aldo Vitagliano in 2004 using the SOLEX software.[9] This would have been a rare case of an occultation of a very bright star visible from a highly populated area, since the shadow path moved acrossNew York state andOntario, including all five boroughs ofNew York City.[9] Observers in the shadow path would have seen the star wink out for as long as 14 seconds.[8][10]
However, thick clouds and rain blocked the view for most if not all people on the shadow path.[11] The website of theInternational Occultation Timing Association does not list any successful observations at all.[12]
Two single chordAsteroid Occultation events have been observed, in 2013 and 2015.[13]
2014 in space | ||
|---|---|---|
Space probe launches |
|    |
| Impact events | ||
| SelectedNEOs | ||
| Exoplanets | ||
| Discoveries |
| |
| Novae | ||
| Comets | ||
| Space exploration |
| |
