&sq=Envato&lang=en&file=File:NASA-Deimos-MarsMoon-20090221.jpg) Deimos, captured by the Mars Reconnaissance Orbiter in false color | |
| Discovery | |
|---|---|
| Discovered by | Asaph Hall |
| Discovery date | 12 August 1877 |
| Designations | |
Designation | Mars II |
| Pronunciation | /ˈdaɪməs/[1] to /ˈdiːməs/[2] or as Greek Δεῖμος (approximated /ˈdeɪmɒs/)[3] |
Named after | Δεῖμος |
| Adjectives | Deimian /ˈdaɪmiən/[4] |
| Orbital characteristics | |
| Epoch 23 September 2012 (JD 2456191.5) | |
| Periapsis | 23455.5 km |
| Apoapsis | 23470.9 km |
| 23463.2 km[5] (6.92 Mars radii) | |
| Eccentricity | 0.00033[5] |
| 1.263 d[5] (30.312 h) | |
Average orbital speed | 1.3513 km/s[6] |
| Inclination | 0.93° (to Mars's equator) 1.791° (to the local Laplace plane)[5] 27.58° (to the ecliptic) |
| Satellite of | Mars |
| Physical characteristics | |
| Dimensions | 16.08 × 11.78 × 10.22 km (± 0.16 × 0.12 × 0.10 km)[7] |
| 6.27±0.07 km[7] | |
| 522±8 km2[7] | |
| Volume | 1033±19 km3[7] |
| Mass | 1.51×1015 kg[8] |
Mean density | 1.465±0.051 g/cm3[7] |
| 0.003 m/s2[6] (306 μ g) | |
| 5.556 m/s (20 km/h)[6] | |
| Synchronous[5] | |
| Albedo | 0.068±0.007[9] |
| Temperature | ≈ 233 K |
| 12.89[10] | |
Deimos /ˈdaɪməs/ (systematic designation: Mars II)[11] is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars.[5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos.[12] It is named after Deimos, the Ancient Greek god and personification of dread and terror.
- ^ The Century Dictionary and Cyclopedia (1914)
- ^ "Moons of Mars – the Center for Planetary Science".
- ^ "Deimos". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
- ^ Harry Shipman (2013) Humans in Space: 21st Century Frontiers, p. 317
- ^ a b c d e f "HORIZONS Web-Interface". NASA. 21 September 2013. Retrieved 4 December 2013.
- ^ a b c Cite error: The named reference
NASAwas invoked but never defined (see the help page). - ^ a b c d e f Cite error: The named reference
Ernst2023was invoked but never defined (see the help page). - ^ Jacobson (2010), as cited in Ernst et al. (2023).[7]
- ^ Cite error: The named reference
JPLSSDwas invoked but never defined (see the help page). - ^ "Mars' Moons".
- ^ Cite error: The named reference
Blunckwas invoked but never defined (see the help page). - ^ Staff (2016). "Deimos". SeaSky.org. Retrieved 23 January 2016.