solar apex
the point directly opposite the solar apex is called the solar antapex and lies in the constellation columba at about r. a. 6h, dec. - 30° .
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…reference frame is called the apex of solar motion. in addition, the calculation of the solar motion provides dispersion in velocity. such dispersions are as intrinsically interesting as the solar motions themselves because a dispersion is an indication of the integrity of the selection of stars used as a reference…
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when scientists found that the sun moves at very high speeds, they also found that these movements will not continue on forever, but rather that the sun is moving towards a specific point near the constellation hercules called the solar apex, which is also known as the apex of the sun’s way .
the solar apex is the point on the celestial sphere, in the constellation hercules (at about r. a. 18h, dec. + 30°), toward which the sun is moving with respect to the local standard of rest, at a rate of about 19. 4 kilometers per second (about 4. 09 astronomical units per year). as the sun slowly orbits the galactic center, nearby stars (as seen from earth) appear to move away from the solar apex because of the sun' s relative velocity .
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, which in turn leads to a radius of 4. 6 times solar. a minimum equatorial rotation velocity of just 25 kilometers per second (low for the class, suggesting that the star may appear more or less pole - on) gives a rotation period of under 9 days. stellar structure theory leads to a mass very close to 8 times that of the sun, and shows the star to be roughly half way through its hydrogen - fusing dwarf lifetime of only 32 million years. while there is a rumor that the star is variable, there seems to be no supporting evidence. in spite of its name, furud is not solitary, but has a lower - mass
companion that shifts furud proper back and forth as the two orbit over a period of 675 days (1. 85 years). nothing is known about it. a guess of two solar masses (consistent with the degree of shift) gives a separation of 3. 2 astronomical units (60 percent jupiter' s distance from the sun), a high eccentricity of 0. 57 moving the stars between 5. 1 and 1. 4 au apart. furud is listed as having an eighth magnitude companion at an angular separation of nearly three minutes of arc, but the dimmer star' s class and motion clearly show the
companionship
to be merely a line - of - sight coincidence. furud is perilously close to the mass limit above which stars explode as
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furud (zeta canis majoris). the proper name of this prominent near - dead - on - third - magnitude (3. 02) star derives from the arabic
al - furud ,
meaning
single
or
solitary ones ,
a plural applying to any such star, but erroneously stuck on bayer' s zeta cma alone. it certainly qualifies, as it is set rather well away from the main figure of
, the dove (making furud quite easy to find). and as a luminous, hot, blue class b (b2. 5) dwarf, it' s well worth locating. the star' s rather goodly distance of 335 light years (known to an accuracy of about six percent) and proximity to the
causes it to be dimmed a bit by interstellar dust, by 0. 16 magnitudes (about 16 percent). making that correction, and another for a large amount of ultraviolet light radiated by a surface heated to 21, 500 kelvin, we find a high luminosity 4020 times that of the
instead, perhaps a rare one composed of neon and oxygen rather than the usual carbon - oxygen mix (the result of advanced nuclear processing). zeta cma is an excellent marker for the
antapex of the sun' s way ,
the direction from which the sun appears to be coming, which lies 3. 5 degrees due west of the star in the constellation
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we present a determination of the cosmic microwave background dipole amplitude and direction from the cobe differential microwave radiometers (dmr) first year of data. data from the six dmr channels are consistent with a doppler - shifted planck function of dipole amplitude deltat = 3. 365±0. 027 mk toward direction (l
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atom, smallest unit into which matter can be divided without the release of electrically charged particles. …
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and the sun runneth on unto a resting place for him. that is the measuring of the mighty, the wise
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the solar apex , or the apex of the sun 's way , refers to the direction that the sun travels with respect to the local standard of rest . this is not to be confused with the sun 's apparent motion through the constellations of the zodiac , which is illusory – this supposed motion is actually caused by the earth revolving around the sun . the solar apex is in the constellation of hercules , southwest of the star vega . there are several coordinates for the solar apex . the visual coordinates ( as obtained by visual observation of the apparent motion ) is right ascension ( ra ) 18ʰ 28ᵐ 0ˢ and declination ( dec ) of 30 ° north ( in galactic coordinates : 56.24 ° longitude , 22.54 ° latitude ) . the radioastronomical position is ra 18ʰ 03ᵐ 50.2 ˢ and dec 30 ° 00 ′ 16.8 ″ ( galactic coordinates : 58.87 ° longitude , 17.72 ° latitude ) . the speed of the sun towards the solar apex is about 20 km/s . this speed is not to be confused with the orbital speed of the sun around the galactic center , which is about 220 km/s and is included in the movement of the local standard of rest . thus the sun gains distance towards the apex at about 1/13 its orbital speed . the sun 's motion in the milky way is not a simple ellipse in the galactic plane ; it also shifts ( " bobs " ) up and down with respect to the plane . the nature and extent of the solar motion was first demonstrated by william herschel in 1783 , who also first determined the direction for the solar apex to lambda herculis , only 10 ° away from today 's accepted position . the solar antapex , the direction opposite of the solar apex , is located near the star zeta canis majoris . 
the solar apex, or the apex of the sun's way, refers to the direction that the sun travels with respect to the local standard of rest. this is not to be confused with the sun's apparent motion through the constellations of the zodiac, which is illusory – this supposed motion is actually caused by the earth revolving around the sun. the solar apex is in the constellation of hercules, southwest of the star vega. there are several coordinates for the solar apex. the visual coordinates (as obtained by visual observation of the apparent motion) is right ascension (ra) 18ʰ 28ᵐ 0ˢ and declination (dec) of 30 ° north (in galactic coordinates: 56.24 ° longitude, 22.54 ° latitude). the radioastronomical position is ra 18ʰ 03ᵐ 50.2 ˢ and dec 30 ° 00 ′ 16.8 ″ (galactic coordinates: 58.87 ° longitude, 17.72 ° latitude). the speed of the sun towards the solar apex is about 20 km/s. this speed is not to be confused with the orbital speed of the sun around the galactic center, which is about 220 km/s and is included in the movement of the local standard of rest. thus the sun gains distance towards the apex at about 1/13 its orbital speed. the sun's motion in the milky way is not a simple ellipse in the galactic plane; it also shifts (" bobs ") up and down with respect to the plane. the nature and extent of the solar motion was first demonstrated by william herschel in 1783, who also first determined the direction for the solar apex to lambda herculis, only 10 ° away from today's accepted position. the solar antapex, the direction opposite of the solar apex, is located near the star zeta canis majoris.
the solar apex, or the apex of the sun's way, refers to the direction that the sun travels with respect to the local standard of rest. this is not to be confused with the sun's apparent motion through the constellations of the zodiac, which is illusory – this supposed motion is actually caused by the earth revolving around the sun. the solar apex is in the constellation of hercules, southwest of the star vega. there are several coordinates for the solar apex. the visual coordinates (as obtained by visual observation of the apparent motion) is right ascension (ra) 18ʰ 28ᵐ 0ˢ and declination (dec) of 30 ° north (in galactic coordinates: 56.24 ° longitude, 22.54 ° latitude). the radioastronomical position is ra 18ʰ 03ᵐ 50.2 ˢ and dec 30 ° 00 ′ 16.8 ″ (galactic coordinates: 58.87 ° longitude, 17.72 ° latitude). the speed of the sun towards the solar apex is about 20 km/s. this speed is not to be confused with the orbital speed of the sun around the galactic center, which is about 220 km/s and is included in the movement of the local standard of rest. thus the sun gains distance towards the apex at about 1/13 its orbital speed. the sun's motion in the milky way is not a simple ellipse in the galactic plane; it also shifts (" bobs ") up and down with respect to the plane. the nature and extent of the solar motion was first demonstrated by william herschel in 1783, who also first determined the direction for the solar apex to lambda herculis, only 10 ° away from today's accepted position. the solar antapex, the direction opposite of the solar apex, is located near the star zeta canis majoris.