Back (18) Melpomene ALS 18 ميلبوميني Arabic 18 ميلبوميني (كويكب) ARZ 18 Melpomene AST (18) Мельпамена Byelorussian 18 Мелпомена Bulgarian (18) Melpòmene Catalan (18) Мельпомена CE Melpomene (planetka) Czech (18) Melpomene German

18 Melpomene

18 Melpomene
Discovery
Discovered byJohn Russell Hind
Discovery date24 June 1852
Designations
(18) Melpomene
Pronunciation/mɛlˈpɒmɪniː/[1]
Named after
Melpomenē
Main belt
AdjectivesMelpomenean /mɛlpɒmɪˈniːən/[2]
Symbol (historical)
Orbital characteristics[3]
Epoch 13 September 2023
(JD 2453300.5)
Aphelion2.797 AU (418.4 million km)
Perihelion1.794 AU (268.4 million km)
2.296 AU (343.5 million km)
Eccentricity0.21839
1,270.62 d (3.48 yr)
0.3995°
Inclination10.132°
150.36°
2023-Sep-11
228.15°
Earth MOID0.81 AU (121 million km)
Physical characteristics
Dimensions170 × 155 × 129 km[4]
(150 × 125 km)[5]
(150 × 170 km)[6]
141±2 km[7]
139.594±2.452 km[3]
Flattening0.19[a]
Mass(4.5±0.9)×1018 kg[7]
3.0×1018 kg[4]
Mean density
3.06±0.62 g/cm3[7]
1.69±0.66 g/cm3[4]
0.48221 d (11.57 h)[3][8]
0.221 (calculated)[7]
0.223[9]
0.181 ± 0.033[3]
S[3]
7.5[10] to 12.0
6.35[3]
0.23" to 0.059"

18 Melpomene is a large, bright main-belt asteroid that was discovered by J. R. Hind on 24 June 1852,[11] and named after Melpomenē, the Muse of tragedy in Greek mythology. Its historical symbol was a dagger over a star; it is in the pipeline for Unicode 17.0 as U+1CECB 𜻋 ().[12][13]

Melpomene is classified as an S-type asteroid and is composed of silicates and metals. This asteroid is orbiting the Sun at a distance of 2.296 AU with a period of 3.48 years and an eccentricity (ovalness) of 0.22. The orbital plane is tilted at an angle of 10.1° to the plane of the ecliptic.[3]

Melpomene occulted the star SAO 114159 on 11 December 1978. A possible Melpomenean satellite with a diameter at least 37 km was detected. The satellite candidate received a provisional designation S/1978 (18) 1.[14] In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.[15] Melpomene was observed with the Hubble Space Telescope in 1993. It was able to resolve the asteroid's slightly elongated shape, but no satellites were detected.[5]

Melpomene has been studied by radar.[16] Photometric observations during 2012 provided a rotation period of 11.571±0.001 h with a brightness variation of 0.34±0.02 in magnitude, which is consistent with previous studies.[17] It has a mean diameter of 141±2 km.[7][3]

Melpomene can reach an apparent magnitude of +7.9 at a favorable opposition near perihelion, such as occurred in September 2002 when it was 0.814 AU (121.8 million km; 317 LD) from Earth.[18]

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ Tim Shephard (2014) Echoing Helicon
  3. ^ a b c d e f g h Cite error: The named reference jpldata was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Baer was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hubble1999 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Hubble2005 was invoked but never defined (see the help page).
  7. ^ a b c d e f Vernazza, P.; et al. (October 2021). "VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis". Astronomy & Astrophysics. 54. Bibcode:2021A&A...654A..56V. doi:10.1051/0004-6361/202141781. hdl:10261/263281. A56.
  8. ^ Cite error: The named reference AstroSurf was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference ADA was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Pasachoff1983 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference IAU_MPC was invoked but never defined (see the help page).
  12. ^ Bala, Gavin Jared; Miller, Kirk (18 September 2023). "Unicode request for historical asteroid symbols" (PDF). unicode.org. Unicode. Retrieved 26 September 2023.
  13. ^ Unicode. "Proposed New Characters: The Pipeline". unicode.org. The Unicode Consortium. Retrieved 6 November 2023.
  14. ^ Cite error: The named reference IAUC3315 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gradie1988 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference detected was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Pilcher2013 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Horizons2002 was invoked but never defined (see the help page).


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