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Mansa Musa was the ruler of the Mali Empire in West Africa. Details recorded here should be sourced; unknown information is left blank.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Sextans[1] |
| Right ascension | 10h 19m 38.00889s[2] |
| Declination | −09° 48′ 22.6058″[2] |
| Apparent magnitude (V) | 12.46[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K7V[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.42±0.55[2] km/s |
| Proper motion (μ) | RA: −41.992(18) mas/yr[2] Dec.: −38.004(18) mas/yr[2] |
| Parallax (π) | 11.4740±0.0163 mas[2] |
| Distance | 284.3 ± 0.4 ly (87.2 ± 0.1 pc) |
| Details[3] | |
| Mass | 0.723+0.028 −0.031[5] M☉ |
| Radius | 0.6506±0.0054 R☉ |
| Surface gravity (log g) | 4.639±0.01[5] cgs |
| Temperature | 4286+34 −40[5] K |
| Metallicity [Fe/H] | −0.01±0.15 dex |
| Rotation | 15.6±0.4 d |
| Rotational velocity (v sin i) | 2.26±0.54 km/s |
| Age | 7±7[6] Gyr |
| Other designations | |
| Gnomon, TOI-656, TIC 36734222, WASP-43, GSC 05490-00141, 2MASS J10193800-0948225[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-43, also named Gnomon, is a K-type star about 284 light-years (87 parsecs) away in the Sextans constellation. It is about half the size of the Sun, and has approximately half the mass. WASP-43 has one known planet in orbit, a hot Jupiter called WASP-43b. At the time of publishing of WASP-43b's discovery on April 15, 2011, the planet was the most closely orbiting hot Jupiter discovered. The small orbit of WASP-43b is thought to be caused by WASP-43's unusually low mass. WASP-43 was first observed between January and May 2009 by the SuperWASP project, and was found to be cooler and slightly richer in metals than the Sun. WASP-43 has also been found to be an active star that rotates at a high velocity.
The designation WASP-43 indicates that this was the 43rd star found to have a planet by the Wide Angle Search for Planets.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[8] The approved names, proposed by a team from Romania, were announced in June 2023. WASP-43 is named Gnomon and its planet is named Astrolábos, after the gnomon and the Greek word for the astrolabe.[9]
WASP-43 was first observed by the WASP-South part of the planet-searching SuperWASP project between January and May 2009. It was determined from the collected data that WASP-43 could potentially host a planet that transited, or crossed in front of, its host star as seen from Earth.[4] Later observations by both the WASP-South and SuperWASP-North sections of SuperWASP between January and May 2010 yielded a total of 13,768 data points.[4]
Scientists interpreted that a 0.81-day orbit of a possible planet from the data, and followed up with observations using the CORALIE spectrograph on the Leonhard Euler Telescope at Chile's La Silla Observatory. CORALIE provided radial velocity measurements that indicated that WASP-43 was being transited by a planet that was 1.8 times Jupiter's mass, now dubbed WASP-43b. Another follow-up using the TRAPPIST telescope further defined the light curve of the body transiting WASP-43.[4]
WASP-43b's discovery was reported on April 15, 2011 in the journal Astronomy and Astrophysics.[4]
WASP-43 is a K-type star with a mass that is 0.72 times that of the Sun, and a radius that is 0.67 times that of the Sun.[5] With an effective temperature of 4400 K, WASP-43 is cooler than the Sun. It also has slightly lower quantities of iron than the Sun, with a measured metallicity of [Fe/H] = -0.05 (89% of that measured in the Sun).[6] However, in general, the star has a slightly larger quantity of metals than the Sun. A notable exception is lithium, which is not present in WASP-43's spectrum. However, the star's spectrum also indicates that WASP-43 is an active star.[4] WASP-43 has been found to rotate quickly, although the exact mechanism that causes such speed in this rotation is uncertain, it may be possible that this is caused by tidal interactions between WASP-43 and its planet.[4]
With an apparent magnitude of 12.5, WASP-43 cannot be seen with the unaided eye.[3] The star is located approximately 87 parsecs (280 light-years) away from Earth.[2]
WASP-43b is a hot Jupiter with a mass that is 1.78 times the mass of Jupiter and a radius that is 0.93 times Jupiter's radius. WASP-43b orbits its host star every 0.813475 days (19.5234 hours) at a distance of 0.015 AU,[3] the closest orbit yet found at the time of WASP-43b's discovery.[4] WASP-43's unusually low mass accounts for WASP-43b's small orbit. Because planets with orbits around stars like WASP-43 are not usually observed, models either suggest that planets like WASP-43b are either uncommon or have short lifetimes caused by a decay in their orbits.[4] WASP-43b has a density of 2.20 g/cm3.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b / Astrolábos | 2.054+0.055 −0.060[5] MJ |
0.01504(29) | 0.813473978(35) | <0.0062[6] | 82.109±0.088 | 1.049+0.014 −0.016[5] RJ |
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
WASP-43, also named Gnomon, is a K-type star about 284 light-years (87 parsecs) away in the Sextans constellation. It is about half the size of the Sun, and has approximately half the mass. WASP-43 has one known planet in orbit, a hot Jupiter called WASP-43b. At the time of publishing of WASP-43b's discovery on April 15, 2011, the planet was the most closely orbiting hot Jupiter discovered. The small orbit of WASP-43b is thought to be caused by WASP-43's unusually low mass. WASP-43 was first observed between January and May 2009 by the SuperWASP project, and was found to be cooler and slightly richer in metals than the Sun. WASP-43 has also been found to be an active star that rotates at a high velocity.
WASP-43b, formally named Astrolábos, is a transiting planet in orbit around the young, active, and low-mass star WASP-43 in the constellation Sextans. The planet is a hot Jupiter with a mass twice that of Jupiter, but with a roughly equal radius. WASP-43b was flagged as a candidate by the SuperWASP program, before they conducted follow-ups using instruments at La Silla Observatory in Chile, which confirmed its existence and provided orbital and physical characteristics. The planet's discovery was published on April 14, 2011. WASP-43b has an orbital period of approximately 0.8 days (19.2 hours), which at the time of discovery was the third-shortest known, surpassed only by WASP-19b and WASP-47e. At the time of its discovery, the size of WASP-43b's orbit was the smallest known for a hot Jupiter, probably due to its host star's low mass.
A gnomon is the part of a sundial that casts the shadow. Gnomon may also refer to: Gnomon (figure), in geometry, a plane figure formed by removing a similar parallelogram from a corner of a larger parallelogram Gnomon (journal), a German language academic journal of classics Gnomon (novel), a science fiction novel by Nick Harkaway Gnomon, the difference between a pair of consecutive figurate numbers Gnomon, one of the twenty-five fictional islands in the fantasy book series The Books of Abarat Gnomon School of Visual Effects, a Hollywood-based university Gnomon, a proposed 1,000 megaton nuclear weapon conceived alongside Sundial. The proper name of the star WASP-43
WASP-12b is a hot Jupiter (a class of extrasolar planets) orbiting the star WASP-12, discovered in April of 2008, by the SuperWASP planetary transit survey. The planet takes only a little over one Earth day to orbit its star, in contrast to about 365.25 days for the Earth to orbit the Sun. Its distance from the star (approximately 3.5 million kilometers [2.2 million miles; 0.023 astronomical units]) is only 1 43 {\displaystyle \textstyle {\frac {1}{43}}} the Earth's distance from the Sun, with an eccentricity the same as Jupiter's. Consequently, it has one of the lowest densities for exoplanets ("inflated" by the flux of energy from the star). On December 3, 2013, scientists working with the Hubble Space Telescope (HST) reported detecting water in the atmosphere of the exoplanet. In July 2014, NASA announced finding very dry atmospheres on three exoplanets (HD 189733b, HD 209458b, WASP-12b) orbiting sun-like stars. In September 2017, researchers working on the HST announced that WASP-12b reflects just 6% of the light that shines on its surface. As a result, its reflectivity has been described as "black as asphalt" and as "pitch black", although it is so hot that it emits a reddish glow.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Mae Jemison, aboard Space Shuttle Endeavour in 1992.
