| 词条 | 115 Thyra |
| 释义 |
| minorplanet=yes | background=#D6D6D6 | name=115 Thyra | image = 115Thyra (Lightcurve Inversion).png | caption=A three-dimensional model of 115 Thyra based on its light curve. | discoverer=James Craig Watson | discovered=6 August 1871 | mpc_name=(115) Thyra | alt_names= | pronounced={{IPAc-en|'|θ|aɪ|r|ə}} | named_after=Thyra | mp_category=Main belt | epoch=31 July 2016 (JD 2457600.5) | orbit_ref=[1] | semimajor={{Convert|2.38077|AU|Gm|abbr=on}} | perihelion={{Convert|1.92394|AU|Gm|abbr=on}} | aphelion={{Convert|2.8376|AU|Gm|abbr=on|lk=on}} | eccentricity=0.19188 | period=3.67 yr (1341.8 d) | inclination=11.595° | asc_node=308.901° | arg_peri=96.946° | mean_anomaly=108.401° | avg_speed=19.13 km/s | dimensions={{val|79.83|1.4|ul=km}}[1] 79.83 km[3] | mass=5.3{{e|17}} kg | density= | surface_grav=0.0223 m/s² | escape_velocity=0.0422 km/s | rotation={{Convert|7.241|h|d|abbr=on|lk=on}} | spectral_type=S[1] | abs_magnitude=7.51[1][3] | albedo={{val|0.2747|0.010}}[1] 0.275[3] | single_temperature=~180 K | mean_motion={{Deg2DMS|0.26830|sup=ms}} / day | observation_arc=143.31 yr (52344 d) | uncertainty=0 | moid={{Convert|0.97246|AU|Gm|abbr=on}} | jupiter_moid={{Convert|2.63437|AU|Gm|abbr=on}} | tisserand=3.486 }}Thyra (minor planet designation: 115 Thyra) is a fairly large and bright inner main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on August 6, 1871 and was named for Thyra, the consort of King Gorm the Old of Denmark. Based upon its spectrum, it is categorized as a stony S-type asteroid.[10] Observations made between 1978 and 1981 produced a composite light curve with two minima and maxima. However, a subsequent study in 1983 only found a single minima and maxima. A synodical rotation period of 7.241 hours was determined. This was confirmed by observations between 1995 and 2000. The changes in brightness and color indicate a surface with an uneven composition.[11] The asteroid has a slightly elongated shape, with a ratio of 1.20 between the lengths of the major and minor axes. The orbital longitude and latitude of the asteroid pole in degrees is estimated to be (λ0, β0) = (68°, 23°).[12] Measurements of the thermal inertia of 115 Thyra give a value of around 75 m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.[3] References1. ^*JPL Small-Body Database Browser [2][3][4][5][6]2. ^1 2 3 4 {{Citation | first1 = Donald K. | last1 = Yeomans | title = 115 Thyra | work = JPL Small-Body Database Browser | publisher = NASA Jet Propulsion Laboratory | url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115 | accessdate= 12 May 2016 | postscript= .}} 3. ^1 2 3 4 {{Citation | last1 = Delbo' | first1 = Marco | last2 = Tanga | first2 = Paolo | title = Thermal inertia of main belt asteroids smaller than 100 km from IRAS data | work = Planetary and Space Science | volume = 57 | issue = 2 | pages = 259–265 |date=February 2009 | doi = 10.1016/j.pss.2008.06.015 | bibcode = 2009P&SS...57..259D | postscript= .|arxiv = 0808.0869 }} 4. ^1 {{Citation | last1 = Michałowski | first1 = T. | last2 = Kwiatkowski | first2 = T. | last3 = Kaasalainen | first3 = M. | last4 = Pych | first4 = W. | last5 = Kryszczyńska | first5 = A. | last6 = Dybczyński | first6 = P. A. | last7 = Velichko | first7 = F. P. | last8 = Erikson | first8 = A. | last9 = Denchev | first9 = P. | last10 = Fauvaud | first10 = S. | last11 = Szabó | first11 = Gy. M. | display-authors = 1 | title = Photometry and models of selected main belt asteroids I. 52 Europa, 115 Thyra, and 382 Dodona | work = Astronomy and Astrophysics | volume = 416 | pages = 353–366 |date=March 2004 | doi = 10.1051/0004-6361:20031706 | bibcode = 2004A&A...416..353M | postscript= .}} 5. ^1 {{Citation | last1 = Kryszczyńska | first1 = A. | last2 = La Spina | first2 = A. | last3 = Paolicchi | first3 = P. | last4 = Harris | first4 = A. W. | last5 = Breiter | first5 = S. | last6 = Pravec | first6 = P. | display-authors = 1 | title = New findings on asteroid spin-vector distributions | work = Icarus | volume = 192 | pages = 223–237 |date=December 2007 | doi = 10.1016/j.icarus.2007.06.008 | bibcode = 2007Icar..192..223K | postscript= .}} 6. ^1 {{Citation |last1 = DeMeo |first1 = Francesca E. |last2 = Binzel |first2 = Richard P. |last3 = Slivan |first3 = Stephen M. |last4 = Bus |first4 = Schelte J. |display-authors = 1 |title = An extension of the Bus asteroid taxonomy into the near-infrared |work = Icarus |volume = 202 |issue = 1 |pages = 160–180 |date = July 2009 |doi = 10.1016/j.icarus.2009.02.005 |bibcode = 2009Icar..202..160D |url = http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf |accessdate = 2013-04-08 |postscript = . |deadurl = yes |archiveurl = https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf |archivedate = 2014-03-17 |df = }} See appendix A. }} External links
7 : Background asteroids|Discoveries by James Watson|Minor planets named for people|Named minor planets|S-type asteroids (SMASS)|S-type asteroids (Tholen)|Astronomical objects discovered in 1871 |
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