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18 Melpomene

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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]
Epoch13 September 2023
(JD2453300.5)
Aphelion2.797AU(418.4 millionkm)
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°
EarthMOID0.81 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)×1018kg[7]
3.0×1018kg[4]
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 Melpomeneis a large, brightmain-beltasteroidthat was discovered byJ. R. Hindon 24 June 1852,[11]and named afterMelpomenē,theMuseoftragedyinGreek mythology.Its historical symbol was a dagger over a star; it is in the pipeline forUnicode17.0 as U+1CECB 𜻋 ().[12][13]

Melpomene is classified as anS-type asteroidand is composed ofsilicatesand metals. This asteroid is orbiting theSunat a distance of 2.296AUwith aperiodof 3.48 years and aneccentricity(ovalness) of 0.22. Theorbital planeis tilted at an angle of 10.1° to theplane of the ecliptic.[3]

MelpomeneoccultedthestarSAO 114159 on 11 December 1978. A possible Melpomeneansatellitewith a diameter at least 37 km was detected. The satellite candidate received aprovisional designationS/1978 (18) 1.[14]In 1988 a search for satellites or dust orbiting this asteroid was performed using theUH88telescope at theMauna Kea Observatories,but the effort came up empty.[15]Melpomene was observed with theHubble Space Telescopein 1993. It was able to resolve the asteroid's slightly elongated shape, but no satellites were detected.[5]

Melpomene has been studied byradar.[16]Photometricobservations during 2012 provided arotation periodof11.571±0.001 hwith a brightness variation of0.34±0.02in magnitude, which is consistent with previous studies.[17]It has amean diameterof141±2 km.[7][3]

Melpomene can reach anapparent magnitudeof +7.9 at a favorableoppositionnearperihelion,such as occurred in September 2002 when it was 0.814AU(121.8 millionkm;317LD) from Earth.[18]

Notes

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  1. ^Flattening derived from the maximum aspect ratio (c/a):,where (c/a) =0.81±0.06.[7]

References

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  1. ^Noah Webster (1884)A Practical Dictionary of the English Language
  2. ^Tim Shephard (2014)Echoing Helicon
  3. ^abcdefghJPL SBDB: 18 Melpomene,NASA Jet Propulsion Laboratory,retrieved20 September2023
  4. ^abcJim Baer (2008)."Recent Asteroid Mass Determinations".Personal Website. Archived fromthe originalon 2 July 2013.Retrieved27 November2008.
  5. ^abStorrs, Alex; Weiss; Zellner; Burlsen; et al. (1999)."Imaging Observations of Asteroids with Hubble Space Telescope"(PDF).Icarus.137(2): 260–268.Bibcode:1999Icar..137..260S.doi:10.1006/icar.1999.6047.Archived fromthe original(PDF)on 30 October 2008.Retrieved3 November2008.
  6. ^Storrs, Alex; Dunne; Conan; Mugnier; et al. (2005)."A closer look at main belt asteroids 1: WF/PC images"(PDF).Icarus.173(2): 409–416.Bibcode:2005Icar..173..409S.doi:10.1016/j.icarus.2004.08.007.Archived fromthe original(PDF)on 10 March 2012.Retrieved26 November2008.
  7. ^abcdefVernazza, 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. ^"Lightcurves and Map Data on Numbered Asteroids N° 1 TO 52225".AstroSurf. Archived fromthe originalon 27 November 2005.Retrieved3 November2008.
  9. ^"Asteroid Data Archive".Planetary Science Institute. Archived fromthe originalon 23 June 2006.Retrieved3 November2008.
  10. ^Menzel, Donald H.; Pasachoff, Jay M. (1983).A Field Guide to the Stars and Planets(2nd ed.). Boston, MA:Houghton Mifflin.p.391.ISBN0-395-34835-8.
  11. ^"Numbered Minor Planets 1–5000",Discovery Circumstances,IAU Minor Planet center,retrieved7 April2013.
  12. ^Bala, Gavin Jared; Miller, Kirk (18 September 2023)."Unicode request for historical asteroid symbols"(PDF).unicode.org.Unicode.Retrieved26 September2023.
  13. ^Unicode."Proposed New Characters: The Pipeline".unicode.org.The Unicode Consortium.Retrieved6 November2023.
  14. ^IAUC 3315: 1978 (18) 1; WZ Sge,Central Bureau for Astronomical Telegrams,retrieved5 July2011.
  15. ^Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results",Abstracts of the Lunar and Planetary Science Conference,vol. 19, pp. 405–406,Bibcode:1988LPI....19..405G.
  16. ^Radar-Detected Asteroids and Comets,NASA/JPL Asteroid Radar Research,retrieved30 October2011.
  17. ^Pilcher, Frederick (January 2013). "Lightcurves and Derived Rotation Periods for 18 Melpomene 38 Leda, and 465 Alekto".Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers.40(1): 33.Bibcode:2013MPBu...40...33P.
  18. ^"Horizons Batch for September 2002".JPL Horizons.Retrieved17 November2022.
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