HE 1523-0901
Coordinates: 
15h 26m 01.2s, −09° 11′ 38″
15h 26m 01.2s, −09° 11′ 38″ Artist's impression of HE 1523-0901 | |
| Observation data J2000
| |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 26m 01.070s[1] |
| Declination | −09° 11′ 38.89″[1] |
| Apparent magnitude (V) | 11.129[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[1]
|
| Spectral type | CEMP[3] |
| B−V color index | +1.057[2] |
| Details | |
Gyr | |
TYC 5594-576-1, 2MASS J15260106-0911388 | |
| Database references | |
| SIMBAD | data |
HE 1523-0901 is the designation given to a
halo stars from the Hamburg/ESO Survey by Anna Frebel and collaborators. The group's research was published in the May 10, 2007 issue of The Astrophysical Journal.[5]
Age
The star's age, as measured by
supernovae
early in the history of known matter.
Designation
The designation "HE 1523-0901" indicates that the star is part of the Hamburg/ESO Survey catalog. A list of astronomical catalogues can be used to find which catalog a star or other object is from based on its prefix. Most objects are listed in several catalogs and will often be known by several different designations.
Observation
HE 1523-0901 is approximately 0.8
total luminosity of 730 times that of the Sun
. It can be viewed particularly well from the southern hemisphere with the use of a small telescope. It can also be observed from central European latitudes.
Spectroscopic companion
HE 1523-0901 was found to be a
spectroscopic binary by a 2015 study.[8] The companion has a minimum mass about 11 times the mass of Jupiter,[9] suggesting that it may be a brown dwarf or massive exoplanet. However, the discovery paper suggests that the companion's orbit may be nearly face-on, which would make the true mass much greater than the minimum mass, at about a quarter the mass of the Sun.[8] Such an object would be a red dwarf star. The orbital inclination
and thus true mass is not yet known with certainty.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥11+4 −1 MJ |
— | 303.05±0.25 | 0.163±0.010 | — | — |
See also
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119500060.
- S2CID 119460225.
- ^ S2CID 247793231.
- ^ a b c
Frebel, A.; et al. (2007). "Discovery of HE 1523–0901, a Strongly r-Process-enhanced Metal-poor Star with Detected Uranium". S2CID 17533424.
- Science Daily. May 11, 2007. Retrieved 2007-05-10.
- PhysOrg. May 10, 2007. Retrieved 2007-05-12.
- ^
- ^
External links
- "Astronomers discover HE 1523-0901 star: Almost as old as universe". iTWire. Archived from the original on 2007-05-14. Retrieved 2007-05-15.
- "Ancient star nearly as old as the universe". NBC News. 11 May 2007. Retrieved 2007-05-14.
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