Is a Silver Coin a Silver Dollar? Neither, it’s galaxy NGC 253.
Tag: binary stars
Its a Sirius distance
Distance to Earth: 8.611 light years
Close. In astronomical terms.
Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius”is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis…
Its a Sirius distance
Distance to Earth: 8.611 light years
Close. In astronomical terms.
Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius”is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis…
Its a Sirius distance
Dog Star
Distance to Earth: 8.611 light years
Close. In astronomical terms.
Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of -1.46, it is almost twice as bright as Canopus, the next brightest star.
The name “Sirius” is derived from the Ancient Greek (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designation Alpha Canis Majoris (a CMa).
What the naked eye perceives as a single star is actually a binary star system, consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white
dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from its companion varies between 8.2 and 31.5 AU
When a star is not just a star
When a star is not just a star
It’s a Binary Star………
Sirius A and B – Binary Star Example
A binary star is a star system consisting of two stars orbiting around their common center of mass. Systems of two, three, four, or even more stars are called multiple
star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as double (or more) by other…
When a star is not just a star
When a star is not just a star
It’s a Binary Star………
Sirius A and B – Binary Star Example
A binary star is a star system consisting of two stars orbiting around their common center of mass. Systems of two, three, four, or even more stars are called multiple
star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as double (or more) by other…
When a star is not just a star
It’s a Binary Star………
Sirius A and B – Binary Star Example
A binary star is a star system consisting of two stars orbiting around their common center of mass. Systems of two, three, four, or even more stars are called multiple
star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as double (or more) by other means.
Research over the last two centuries suggests that half or more of visible stars are part of multiple star systems.The term double star is often used synonymously with binary star; however, double star can also mean optical double star. Optical doubles are so called because the two stars
appear close together in the sky as seen from the Earth; they are almost on the same line of sight. Nevertheless, their “doubleness” depends only on this optical effect; the stars
themselves are distant from one another and share no physical connection. A double star can be revealed as optical by means of differences in their parallax measurements, proper
motions, or radial velocities. Most known double stars have not been studied sufficiently closely to determine whether they are optical doubles or they are doubles physically
bound through gravitation into a multiple star system.
The Sun
The Sun is a G-type main-sequence star comprising about 99.86% of the total mass of the Solar System. It is a near-perfect sphere, with an oblateness estimated at about 9
millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometres (6.2 mi). Since the Sun consists of a plasma and is not solid, it rotates
faster at its equator than at its poles. This behavior is known as differential rotation and is caused by convection in the Sun and the movement of mass, due to steep temperature
gradients from the core outwards. This mass carries a portion of the Sun’s counter-clockwise angular momentum (as viewed from the ecliptic north pole), thus redistributing the angular velocity. The period of this actual rotation is approximately 25.6 days at the equator and 33.5 days at the poles.
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- Beyond the Milky Way
Our Nearest Main Sequence Star
The Sun The Sun is a G-type main-sequence star comprising about 99.86% of the total mass of the Solar System.
The Sun
The Sun is a G-type main-sequence star comprising about 99.86% of the total mass of the Solar System. It is a near-perfect sphere, with an oblateness estimated at about 9
millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometres (6.2 mi). Since the Sun consists of a plasma and is not solid, it rotates
faster at its equator than at its poles. This behavior is known as differential rotation and is caused by convection in the Sun and the movement of mass, due to steep temperature
gradients from the core outwards. This mass carries a portion of the Sun’s counter-clockwise angular momentum (as viewed from the ecliptic north pole), thus redistributing the angular velocity. The period of this actual rotation is approximately 25.6 days at the equator and 33.5 days at the poles.
#gallery-0-7 {
margin: auto;
}
#gallery-0-7 .gallery-item {
float: left;
margin-top: 10px;
text-align: center;
width: 33%;
}
#gallery-0-7 img {
border: 2px solid #cfcfcf;
}
#gallery-0-7 .gallery-caption {
margin-left: 0;
}
/* see gallery_shortcode() in wp-includes/media.php */
-
- Beyond the Milky Way
Our Nearest Main Sequence Star
The Sun The Sun is a G-type main-sequence star comprising about 99.86% of the total mass of the Solar System.
Our Nearest Main Sequence Star
The Sun
The Sun is a G-type main-sequence star comprising about 99.86% of the total mass of the Solar System. It is a near-perfect sphere, with an oblateness estimated at about 9
millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometres (6.2 mi). Since the Sun consists of a plasma and is not solid, it rotates
faster at its equator than at its poles. This behavior is known as differential rotation and is caused by convection in the Sun and the movement of mass, due to steep temperature
gradients from the core outwards. This mass carries a portion of the Sun’s counter-clockwise angular momentum (as viewed from the ecliptic north pole), thus redistributing the angular velocity. The period of this actual rotation is approximately 25.6 days at the equator and 33.5 days at the poles.
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