Astronomy:80 Sappho
 Lightcurve-based 3D-model of Sappho on the top and the image on the bottom. | |
| Discovery | |
|---|---|
| Discovered by | N. R. Pogson |
| Discovery site | Madras Obs. |
| Discovery date | 2 May 1864 |
| Designations | |
| (80) Sappho | |
| Pronunciation | /ˈsæfoʊ/[1] |
| Named after | Sappho (Greek poet) |
| Minor planet category | main-belt · (inner) |
| Adjectives | Sapphonian /sæˈfoʊniən/[2] Sapphoian /sæˈfoʊ.iən/[3] |
| Orbital characteristics[4] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| |{{{apsis}}}|helion}} | 2.7544 astronomical unit|AU (412.05 Gm) |
| |{{{apsis}}}|helion}} | 1.8370 AU (274.81 Gm) |
| 2.2957 AU (343.43 Gm) | |
| Eccentricity | 0.19980 |
| Orbital period | 3.48 yr (1270.5 d) |
| Mean anomaly | 287.260° |
| Mean motion | 0° 17m 0.06s / day |
| Inclination | 8.676° |
| Longitude of ascending node | 218.699° |
| 139.662° | |
| Earth MOID | 0.843652 AU (126.2085 Gm) |
| Jupiter MOID | 2.7319 AU (408.69 Gm) |
| TJupiter | 3.553 |
| Physical characteristics[4] | |
| Mean diameter | 68.563±1.033 km |
| Mass | (4.6 ± 2.11/0.86)×1017 kg[5] |
| Mean density | 3.055 ± 1.400/0.569 g/cm3[5][lower-alpha 1] |
| Rotation period | 14.03087[6] h |
| Pole ecliptic latitude | 194°[6] |
| Pole ecliptic longitude | −26°[6] |
| Geometric albedo | 0.206±0.014[4] 0.185 [7] |
| S-type asteroid | |
| Apparent magnitude | 9.38 to 13.6 |
| Absolute magnitude (H) | 7.98 |
80 Sappho (symbol: 16x16px) is a large, S-type (stony) main-belt asteroid. It was discovered by English astronomer Norman Pogson on 2 May 1864, and is named after Sappho, the Archaic Greece poet. The asteroid is orbiting the Sun at a distance of 2.2957 astronomical unit|AU with a period of 3.48 years and an eccentricity (ovalness) of 0.2. The orbital plane is inclined at an angle of 8.68° to the plane of the ecliptic.[4]
13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 83 kilometres (52 mi).[8] Hanuš et al. (2013) confirmed the polar axis has ecliptic coordinates (λ, β) = (194°, −26°) and listed a rotation period of 14.03087 h.[6]
Sappho (at apparent magnitude 11.8) occulted the magnitude 7.2 star HIP 24403 in the constellation of Taurus on 16 September 2018 at 8:54 UT.[9][10] Sacramento and Salt Lake City were the two major cities located underneath the shadow path. Data from this event will help improve the shape model of the asteroid. During the occultation the asteroid was roughly 1.6 AU (240,000,000 km; 150,000,000 mi) from Earth with an uncertainty of ±76 km.
Notes
- ↑ Assuming a diameter of 66 ± 8 km.
References
- ↑ Sappho (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Sappho (Subscription or UK public library membership required.)
- ↑ Catherine Hobbs (1995) Nineteenth-century Women Learn to Write
- ↑ The Thistle, January 1903, vol. I, no. 2, p. 4
- ↑ 4.0 4.1 4.2 4.3 "80 Sappho", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=80, retrieved 2013-03-30.
- ↑ 5.0 5.1 Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society 492 (1): 589–602. doi:10.1093/mnras/stz3407. https://academic.oup.com/mnras/article/492/1/589/5658701.
- ↑ 6.0 6.1 6.2 6.3 Hanuš, J. et al. (September 2013), "Sizes of main-belt asteroids by combining shape models and Keck adaptive optics observations", Icarus 226 (1): 1045–1057, doi:10.1016/j.icarus.2013.07.023, Bibcode: 2013Icar..226.1045H.
- ↑ "Asteroid Data Sets". http://www.psi.edu/pds/resource/albedo.html.
- ↑ Ostro, S. J. et al. (August 1985), "Mainbelt asteroids - Dual-polarization radar observations", Science 229 (4712): 442–446, doi:10.1126/science.229.4712.442, PMID 17738665, Bibcode: 1985Sci...229..442O.
- ↑ "Interactive GoogleMap of Shadow Path". http://www.poyntsource.com/New/Google/20180916_56486.HTM.
- ↑ "(80) Sappho / HIP 24403 event on 2018 Sep 16, 08:54 UT". http://www.asteroidoccultation.com/2018_09/0916_80_56486.htm.
External links
- Shape model for 80 Sappho
- 80 Sappho at AstDyS-2, Asteroids—Dynamic Site
- 80 Sappho at the JPL Small-Body Database
vec:Lista de asteroidi#80 Safo
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