| 词条 | Larissa (moon) |
| 释义 |
| name = Larissa | adjectives = | image = Larissa 1.jpg | discoverer = Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky, and David J. Tholen | discovered = May 24, 1981 | caption = Larissa from Voyager 2 | alt_names = S/1989 N 2 S/1981 N 1 | pronounced = {{IPAc-en|l|ə|ˈ|r|ɪ|s|ə}}{{cn|date=February 2019}} | named_after = Larissa | orbit_ref = [1][2] | epoch = 18 August 1989 | semimajor = 73 548.26 km | eccentricity = 0.001393 ± 0.00008 | period = 0.55465332 ± 0.00000001 d | avg_speed = | inclination = {{unbulleted list | 0.251 ± 0.009° (to Neptune equator) | 0.205° (to local Laplace plane) }} | satellite_of = Neptune | dimensions = 216 × 204 × 168 km (± ~10 km)[3][4] | mean_radius = 97 ± 5.4 km[2] | volume = ~3.5{{e|6}} km³ | mass = ~4.2{{e|18}} kg (estimate){{refn | name = mass estimate | group = lower-alpha | The mass estimate is based on the assumed density of 1.2 g/cm³, and a volume of 3.5 {{e|6}} km³ obtained from a detailed shape model in Stooke (1994).[6] }} | density = ~1.2 g/cm³ (estimate)[7] | surface_grav = ~{{Gr|0.0042|97|3}} m/s2 | escape_velocity = ~{{V2|0.0042|97|3}} km/s | rotation = synchronous | axial_tilt = zero | albedo = 0.09[3][7] | magnitude = 21.5[7] | single_temperature = ~51 K mean (estimate) | note=no }} Larissa ({{IPAc-en|l|ə|ˈ|r|ɪ|s|ə}} {{respell|lə|RISS|ə}}; Greek: Λάρισσα), also known as Neptune VII, is the fifth-closest inner satellite of Neptune. It is named after Larissa, a lover of Poseidon (Neptune) in Greek mythology and eponymous nymph of the city in Thessaly, Greece. DiscoveryIt was first discovered by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen, based on fortuitous ground-based stellar occultation observations[13] on May 24, 1981, given the temporary designation S/1981 N 1 and announced on May 29, 1981.[14] The moon was recovered and confirmed to be the only object in its orbit during the Voyager 2 flyby in 1989[15] after which it received the additional designation S/1989 N 2 on August 2, 1989.[16] The announcement by Stephen P. Synnott spoke of “10 frames taken over 5 days”, which gives a recovery date sometime before July 28. The name was given on September 16, 1991.[17] CharacteristicsThe fourth-largest satellite of Neptune, Larissa is irregular (non-spherical) in shape and appears to be heavily cratered, with no sign of any geological modification. It is likely that Larissa, like the other satellites inward of Triton, is a rubble pile re-accreted from fragments of Neptune's original satellites, which were disrupted by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit.[18] Larissa's orbit is nearly circular and lies below Neptune's synchronous orbit radius, so it is slowly spiralling inward due to tidal deceleration and may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching, similarly to how Triton will eventually collide with Neptune or break into a planetary ring. ExplorationLarissa has only been visited by Voyager 2. The probe was able to get photographs of Larissa, showing it's cratered surface. Notes1. ^1 {{cite journal| doi = 10.1086/423037| last1 = Jacobson | first1 = R. A.| last2 = Owen | first2 = W. M., Jr.| year = 2004| pages = 1412–1417| title = The orbits of the inner Neptunian satellites from Voyager, Earthbased, and Hubble Space Telescope observations| journal = Astronomical Journal| volume = 128| issue = 3| bibcode = 2004AJ....128.1412J| ref = harv}} }}.2. ^1 2 {{cite journal| doi = 10.1016/S0019-1035(03)00002-2| last = Karkoschka| first = Erich| year = 2003| title = Sizes, shapes, and albedos of the inner satellites of Neptune| journal = Icarus| volume = 162| issue = 2| pages = 400–407| bibcode = 2003Icar..162..400K| ref = harv}} 3. ^1 {{cite web| last = Williams| first = Dr. David R.| date = 2008-01-22| title = Neptunian Satellite Fact Sheet| publisher = NASA (National Space Science Data Center)| url = http://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html| accessdate = 2008-12-13}} 4. ^1 2 3 {{cite web| title = Planetary Satellite Physical Parameters| date = 2010-10-18| publisher = JPL (Solar System Dynamics)| url = http://ssd.jpl.nasa.gov/?sat_phys_par| accessdate = 2011-10-11}} 5. ^1 {{cite journal| doi = 10.1007/BF00572198| last = Stooke| first = Philip J.| year = 1994| title = The surfaces of Larissa and Proteus| journal = Earth, Moon, and Planets| volume = 65| issue = 1| pages = 31–54| bibcode = 1994EM&P...65...31S| pmid = | pmc = | ref = harv}} 6. ^1 {{cite journal| doi = 10.1126/science.215.4530.289| last1 = Reitsema| first1 = H. J.| last2 = Hubbard| first2 = W. B.| last3 = Lebofsky| first3 = L. A.| last4 = Tholen| first4 = D. J.| title = Occultation by a Possible Third Satellite of Neptune| journal = Science| volume = 215| issue = 4530| pages = 289–291| year = 1982| bibcode = 1982Sci...215..289R| pmid = 17784355| pmc = | ref = harv}} 7. ^1 {{cite journal| last = Marsden| first = Brian G.| title = S/1981 N 1| date = May 29, 1981| journal = IAU Circular| volume = 3608| url = http://www.cbat.eps.harvard.edu/iauc/03600/03608.html| accessdate = 2011-10-26}} 8. ^1 {{cite journal| doi = 10.1126/science.246.4936.1422| last1 = Smith| first1 = B. A.| last2 = Soderblom| first2 = L. A.| last3 = Banfield| first3 = D.| last4 = Barnet| first4 = C.| last5 = Basilevsky| first5 = A. T.| last6 = Beebe| first6 = R. F.| last7 = Bollinger| first7 = K.| last8 = Boyce| first8 = J. M.| last9 = Brahic| first9 = A.| year = 1989| title = Voyager 2 at Neptune: Imaging Science Results| journal = Science| volume = 246| issue = 4936| pages = 1422–1449| bibcode = 1989Sci...246.1422S| pmid = 17755997| ref = {{sfnRef|Smith Soderblom et al.|1989}}}} [on page 1435] 9. ^1 {{cite journal| last = Marsden| first = Brian G.| title = Satellites of Neptune| date = August 2, 1989| journal = IAU Circular| volume = 4824| url = http://www.cbat.eps.harvard.edu/iauc/04800/04824.html| accessdate = 2011-10-26}} 10. ^1 {{cite journal| last = Marsden| first = Brian G.| title = Satellites of Saturn and Neptune| date = September 16, 1991| journal = IAU Circular| volume = 5347| url = http://www.cbat.eps.harvard.edu/iauc/05300/05347.html| accessdate = 2011-10-26}} 11. ^1 {{cite journal| doi = 10.1016/0019-1035(92)90155-Z| last1 = Banfield| first1 = Don| last2 = Murray| first2 = Norm| date=October 1992 | title = A dynamical history of the inner Neptunian satellites| journal = Icarus| volume = 99| issue = 2| pages = 390–401| pmid = | pmc = | bibcode = 1992Icar...99..390B| ref = harv}} 12. ^1 2 {{cite journal|last1= Showalter|first1=M. R.|last2=de Pater|first2= I.|last3= Lissauer|first3=J. J.|last4= French|first4=R. S.|url=https://www.spacetelescope.org/static/archives/releases/science_papers/heic1904/heic1904a.pdf|title= The seventh inner moon of Neptune|journal= Nature|volume= 566|issue= 7744|year= 2019|pages= 350–353|doi= 10.1038/s41586-019-0909-9}} }} References{{reflist| refs =[1][2][3][4][5][6][7][8][9][10][11][12] }} External links{{Commons category|Larissa (moon)}}
3 : Moons of Neptune|Astronomical objects discovered in 1981|Objects observed by stellar occultation |
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