Gliese 4
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Double star Gliese 4 |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| AladinLite | ||||||||||||||||||||||||||
| Constellation | Andromeda | |||||||||||||||||||||||||
| Apparent brightness | 8.22 likes | |||||||||||||||||||||||||
| Astrometry | ||||||||||||||||||||||||||
| Radial velocity | A: +3.50 ± 2.0 km / s / B: +1.90 ± 2.0 km / s |
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| parallax | A: 88.44 ± 1.56 mas / B: 88.44 ± 1.56 mas |
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| distance | 36.879 Lj (11,307 pc ) |
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| Absolute visual brightness M vis | 8.67 likes | |||||||||||||||||||||||||
| Proper movement : | ||||||||||||||||||||||||||
| Rec. Share: | 887.48 mas / a / 887.48 mas / a |
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| Dec. portion: | -152.02 mas / a / -152.02 mas / a |
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| orbit | ||||||||||||||||||||||||||
| Major semi-axis | 6 " / 68 AU distance | |||||||||||||||||||||||||
| Individual data | ||||||||||||||||||||||||||
| Names | A ; B. | |||||||||||||||||||||||||
| Observation data: | ||||||||||||||||||||||||||
| Right ascension | A. | 00 h 05 m 41.013 s | ||||||||||||||||||||||||
| B. | 00 h 05 m 40.342 s | |||||||||||||||||||||||||
| declination | A. | + 45 ° 48 ′ 43.49 ″ | ||||||||||||||||||||||||
| B. | + 45 ° 48 ′ 38.73 ″ | |||||||||||||||||||||||||
| Apparent brightness | A. | 8,826 mag | ||||||||||||||||||||||||
| B. | 8,995 likes | |||||||||||||||||||||||||
| Typing: | ||||||||||||||||||||||||||
| Spectral class | A. | K6.0Ve | ||||||||||||||||||||||||
| B. | M0.5V | |||||||||||||||||||||||||
| B − V color index | A. | +1.444 | ||||||||||||||||||||||||
| B. | +1.442 | |||||||||||||||||||||||||
| U − B color index | A. | +1.290 | ||||||||||||||||||||||||
| B. | +1.240 | |||||||||||||||||||||||||
| Physical Properties: | ||||||||||||||||||||||||||
| Dimensions | A. | 0.75 M ☉ | ||||||||||||||||||||||||
| B. | 0.74 M ☉ | |||||||||||||||||||||||||
| radius | A. | 0.65 R ☉ | ||||||||||||||||||||||||
| B. | 0.65 R ☉ | |||||||||||||||||||||||||
| Other names and catalog entries |
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Gliese 4 ( BD + 45 ° 4408, HD 38, HIP 473) is a double star in the constellation Andromeda . Gliese 4 AB is 36.9 light years from the sun away and is one of the solar neighborhood systems . With an apparent magnitude of 8.67 mag, it is too faint to be observed without a telescope.
Astrometry
Galactic orbit
Gliese 4 A and B circle the center of the Milky Way at a distance that varies between 6,077 and 8,014 pc, with an eccentricity of 0.138 ( major orbit half-axis 7,046 pc (22,981 LJ)). The current distance to the galactic center is 7,405 pc (24,152 LJ), the orbital speed relative to the sun 48.2 km / s.
distance
The most precise measurement of the parallax of 88.44 ± 1.56 mas comes from the year 2007. This results in a distance of the system to the earth of 36.879 light years (2,332,300 AU ).
The proper movement in the sky that can be observed from earth is 0.87 ″ ( arc seconds ) annually .
Determination of the distance for Gliese 4
| year | source | Parallax (mas) | Distance (pc) | Distance (Lj) | Distance ( Pm ) |
|---|---|---|---|---|---|
| 1970 | Woolley et al. |
94.00 ± 4.00 | 10.638 +0.47−0.43 | 34.697 +1.54−1.42 | 328.26 +14.59−13.40 |
| 1991 |
Gliese & Jahreiß |
87.00 ± 3.80 | 11.494 +0.52−0.48 | 37.489 +1.71−1.57 | 354.68 +16.20−14.84 |
| 1995 | Yale Parallax Catalog | 88.60 ± 2.30 | 11.287 + 0.30−0.29 | 36.812 +0.98−0.93 | 348.27 +9.28−8.81 |
| 1997 | Hipparcos catalog | 85.10 ± 2.74 | 11.751 +0.39−0.37 | 38.326 +1.28−1.20 | 362.59 +12.06−11.31 |
| 2007 | van Leeuwen |
88.44 ± 1.56 | 11.307 +0.20−0.20 | 36.879 +0.66−0.64 | 348.90 +6.26−6.05 |
System Gliese 4 AB
The visual distance between the two components, which are probably approximately the same size and move in an elliptical orbit around the common center of mass , is 6 milli-arcseconds (mas) in 2013. At this heliocentric distance, this corresponds to a real distance between the two stars of approx. 68 AU . In 1876 an angular distance of 4.5 mas was measured (corresponds to 50.1 AU). As a system, Gliese 4 belongs to the spectral class K2.0V. The total mass of the system is 1.496 solar masses .
Gliese 4 A
Gliese 4 A, an orange dwarf star, has an apparent magnitude of +8.83 mag and belongs to the spectral class K6.0Ve. (K7.0V according to the Luyten catalog). Its diameter should be around 0.65 solar radii ; this corresponds to 905,000 km. The mass of the star is 0.75 M☉ .
It bears the designations HD 38 A and BD + 45 ° 4408 A in various star catalogs .
Gliese 4 B
The +9.00 mag bright companion star Gliese 4 B belongs to the spectral class M0.5V and is classified as a later red main sequence star . The spectral class is also specified with M0.0V (K8.0V according to the Luyten catalog). It is one of the (relatively) large representatives of this type, which are on the threshold of the K spectral class. As with Gliese 4 A, its radius is specified as 0.65 R☉ . At 0.74 solar masses, its mass is slightly lower than that of the A star.
It also bears the designations HD 38 B and BD + 45 ° 4408 B.
Belonging to the ADS 48 system
The system of (officially) seven stars known as ADS 48 consists in the narrower sense only of the binary star system Gliese 4 A and B. For a long time there was uncertainty about the red dwarf star Gliese 2 (ADS 48 F), but recent measurements indicate that it is Although it has a comparable proper movement and distance to the solar system as the Gliese 4 system, it is not gravitationally bound to it. The galactic orbit of Gliese 4 AB is slightly faster and less elliptical compared to the orbit of the western star Gliese 2, which is almost 0.2 light years (around 11,500 AU) closer to the sun. The angular distance of 328 arc seconds determined during the measurements corresponds to a distance of 3706 astronomical units to the double system at this heliocentric distance .
The other four components of the ADS 48 system are background stars that are in no way related to the above three stars. The distances of these stars are so far unknown, so the values for the measured visual brightness are based on an assumed equal heliocentric distance to the Gliese 4 system. ADS 48 "C" is itself a double system of two stars that are close to each other and that orbit each other at a similar distance as the two Gliese 4 stars. The components "D", "E" and "P", of which "P" is optically closest to the Gliese 4 system, are single stars. The ADS 48 system is also referred to as STT 547 (but excluding "P").
In the Washington double star catalog, the components "G", "Q", "X" and "Y" are also listed, in other sources there is an "R" component. So the system would have to consist of a total of 13 individual stars.
| Surname | Another name |
Spectral class |
Coordinates |
Angular distance as |
Radial weakened. km / s |
Own weighted RA mas / s |
Own weight DA mas / s |
Apparent Helligk. like |
|---|---|---|---|---|---|---|---|---|
|
ADS 48 A Gliese 4 A |
WDS J00057 + 4549 A 2MASS J00054091 + 4548435 |
K6.0V | 00h 05m 41.013s + 45 ° 48 ′ 43.49 ″ |
0.00 | 3.50 | 878.72 | -153.90 | 8.83 |
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ADS 48 B Gliese 4 B |
WDS J00057 + 4549 B 2MASS J00054090 + 4548374 |
M0.5V | 00h 05m 40.342s + 45 ° 48 ′ 38.73 ″ |
6.00 (2013) | 1.90 | 878.72 | -153.90 | 9.00 |
| ADS 48 Ca STT 547 C |
WDS J00057 + 4549 Ca GSC 03246-01561 |
? | 00h 05m 40.342s + 45 ° 48 ′ 38.73 ″ |
113.40 (2012) | 0.00 | 0.00 | 13.71 | |
| ADS 48 Cb STT 547 C |
WDS J00057 + 4549 Cb GSC 03246-01561 |
? | 00h 05m 40.342s + 45 ° 48 ′ 38.73 ″ |
113.40 (2012) | 0.00 | 0.00 | 14.90 | |
| ADS 48 D GSC + 03246-01146 |
WDS J00057 + 4549 D 2MASS J00053425 + 4547303 |
? | 00h 05m 34.248s + 45 ° 47 ′ 30.27 ″ |
108.40 (2012) | 2.90 | -0.20 | 12.53 | |
| ADS 48 E GSC + 03246-01100 |
WDS J00057 + 4549 E 2MASS J00054081 + 4549374 |
? | 00h 05m 40.819s + 45 ° 49 ′ 37.42 ″ |
57.50 (2013) | 8.00 | -8.90 | 11.68 | |
| ADS 48 F Gliese 2 |
WDS J00057 + 4549 F 2MASS J00051079 + 4547116 |
M2.0Ve | 00h 05m 10.889s + 45 ° 47 ′ 11.65 ″ |
327.90 (2007) | -0.39 | 870.19 | -150.45 | 9.97 |
| ADS 48 P POP 217 P |
WDS J00057 + 4549 P GSC + 03246-00320 |
? | 00h 05m 41.432s + 45 ° 48 ′ 52.44 ″ |
13.10 (2013) | 0.10 | 3.90 | 13.00 |
Individual evidence
- ↑ a b c van Leeuwen F. (2007): HIP 473. Accessed July 1, 2015 .
- ↑ a b c d Gliese, W .; Jahreiß, H. (1991): Gliese 4 A & B. Accessed July 1, 2015 .
- ↑ SIMBAD: HD 38.Retrieved July 1, 2015 .
- ↑ a b c Van Altena WF et al. (1995): GCTP 4. Retrieved July 1, 2015 .
- ↑ a b c P. Lampens et al .: Multicolour CCD Measurements of Visual Double and Multiple Stars. III . arxiv : astro-ph / 0611515 .
- ↑ Pasinetti-Fracassini et al. (2001): Catalog of Stellar Diameters (CADARS). Retrieved July 1, 2015 .
- ↑ Ashland Astronomy Studio: HD 38 (HIP 473). (No longer available online.) Archived from the original on July 4, 2015 ; accessed on July 1, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Woolley et al. (1970): Woolley 4 AB. Retrieved July 1, 2015 .
- ↑ Perryman et al. (1997): HIP 473.Retrieved July 1, 2015 .
- ↑ Z. Cvetković et al. (2008) PDF: CCD Measurments of double and multiple stars at Nao Rozhen. Retrieved July 1, 2015 .
- ↑ a b c Mason et al. 2001-2014: WDS J00057 + 4549. Retrieved July 1, 2015 .
- ^ SAO Star Catalog: SAO. Retrieved July 1, 2015 .
- ↑ Luyten LHS (1979): LHS 1016. Accessed July 1, 2015 .
- ↑ Luyten LHS (1979): LHS 1017. Accessed July 1, 2015 .
- ↑ Z. Cvetković et al. (2012) PDF: ADS 48: Visual binary or multiple system. Accessed July 1, 2015 .
- ↑ SIMBAD: Gliese 4 A. Accessed July 1, 2015 .
- ↑ SIMBAD: Gliese 4 B. Accessed July 1, 2015 .
- ↑ Dommanget et al. (2002): CCDM J00057 + 4548 C. Accessed July 1, 2015 .
- ↑ SIMBAD: GSC + 03246-01146. Retrieved July 1, 2015 .
- ↑ SIMBAD: GSC + 03246-01146. Retrieved July 1, 2015 .
- ↑ SIMBAD: Gliese 2. Accessed July 1, 2015 .
- ↑ SIMBAD: POP 217 P. Retrieved July 1, 2015 .
