HD 128311

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Stern
HD 128311
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Bear keeper
Right ascension 14 h 36 m 0.56 s
declination + 09 ° 44 ′ 47.5 ″
Apparent brightness 7.446 likes
Typing
Known exoplanets 2
B − V color index 0.995 
U − B color index 0.791 
R − I index 0.47 
Spectral class K3V C
Astrometry
Radial velocity (−9.577 ± 0.0639) km / s
parallax (61.21 ± 0.074)  mas
distance (53.26 ± 0.064)  Lj
(16.34 ± 0.0197)  pc  
Visual absolute brightness M vis +6.39 mag
Proper movement 
Rec. Share: (204.36 ± 0.115)  mas / a
Dec. portion: (−250.39 ± 0.116)  mas / a
Physical Properties
Dimensions 0.84  M ☉
radius 0.73  R ☉
Effective temperature 4965  K
Metallicity [Fe / H] 0.08
Rotation time 14 d
Age 0.7 - 12.7 × 10 9  a
Other names
and catalog entries
Henry Draper Catalog HD 128311 [1]
Hipparcos catalog HIP 71395 [2]
SAO catalog SAO 120554 [3]
2MASS catalog 2MASS J14360055 + 0944474 [4]
Other names V * HN Boo, G 66-11, LTT 14312, TYC 910-165-1, AG + 09 1729, G 135-72, UBV M 20261, AGKR 13043, GJ 3860, NLTT 37851, USNO-B1.0 0997- 00253041, ASCC 1047672, GSC 00910-00165, PPM 160797, uvby98 100128311, BD + 10 2710, RX J1436.0 + 0944, WISEA J143600.72 + 094444.5, Ci 18 1921, HIC 71395, 1RXS J143600.5 + 094453, YZC 19 5152, EUVE J1436 + 09.7, YZ 9 5152, GC 19679, IRAS 14335 + 0957, SKY # 26559, Gaia DR2 1176209886733406592, GEN # +1.00128311, LSPM J1436 + 0944, SPOCS 606
annotation
  1. ↑ Calculated from apparent brightness and distance.

HD 128311 is a BY Draconis star with spectral class K3 V, an estimated age of 0.7 to 12.7 × 10 9 years and a distance of 16.34  pc from Earth. It has a mass of 0.84 M ⊙ . It is probably a member of the Ursa Major movement group. Movement groups are the links between stars in open clusters and associations on the one hand and field stars on the other.

In 2003 a first Planet HD 128311 b of the system was discovered with a period of 422 days with high-precision radial velocity measurements. In 2005 a second planet HD 128311 c was discovered with an orbital period of 928 days.

The discovery of cold dust around HD 128311 shows that there are most likely still collisions in this system due to the interaction of large planetesimals , small undiscovered planets, or to interactions between known planets.

HD 128311 is one of the few systems known to contain planets and debris , making its study even more relevant to the formation and evolution of extrasolar planetary systems. Like ε Eridani and HD 69830 , HD 128311 also has an extensive belt of rubble with a radius of more than 5.1 AU (> 763 million km).

In the combined radial velocity data, another signal was found with a period of P RV = 11.2210 ± 0.0008 days and an eccentricity of 0.204 ± 0.030, which indicates a further planet (HD 128311 d) with a lower mass limit of M UG ∼ 0.136 ± 0.007 M JUP could indicate. By means of a bisector analysis, an origin of the signal through star activity could be excluded.

Web links

Individual evidence

  1. ↑ a b c d e f g h i HD 128311. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on July 9, 2019 .
  2. ^ RO Gray et al 2003 AJ 126 2048: Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I. . In: The Astronomical Journal, Volume 126, Number 4 . July 11, 2003. doi : 10.1086 / 378365 .
  3. ↑ a b Vogt, Steven S. et al .: Five New Multicomponent Planetary Systems . In: The Astrophysical Journal, Volume 632, Issue 1, pp. 638-658. . October 2005. bibcode : 2005ApJ ... 632..638V . doi : 10.1086 / 432901 .
  4. ^ A b c Jeff A. Valenti and Debra A. Fischer 2005 ApJS 159 141: Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs . In: The Astrophysical Journal Supplement Series, Volume 159, Number 1 . March 21, 2005. doi : 10.1086 / 430500 .
  5. ↑ a b Butler, R. et al .: Seven New Keck Planets Orbiting G and K Dwarfs . In: The Astrophysical Journal, Volume 582, Issue 1, pp. 455-466 . January 2003. bibcode : 2003ApJ ... 582..455B . doi : 10.1086 / 344570 .
  6. ↑ a b c Barbara. E. McArthur et al. 2014 ApJ 795 41: Astrometry, radial velocity, and photometry: The HD 128311 System remixed with data from HST, HET, and APT . In: The Astrophysical Journal, Volume 795, Issue 1, article id. 41, 28 pp. (2014). . October 10, 2014. doi : 10.1088 / 0004-637X / 795/1/41 .
  7. ↑ J. Maldonado, et al. 2010: A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups . In: Astronomy and Astrophysics, Volume 521, id.A12, 40 pp. . October 14, 2014. doi : 10.1051 / 0004-6361 / 201014948 .
  8. ^ Butler, R. Paul, et al .: Seven New Keck Planets Orbiting G and K Dwarfs . In: The Astrophysical Journal, Volume 582, Issue 1, pp. 455-466. . January 2003. bibcode : 2003ApJ ... 582..455B . doi : 10.1086 / 344570 .
  9. ↑ Steven S. Vogt et al 2005 ApJ 632 638: Five New Multicomponent Planetary Systems . In: The Astrophysical Journal, Volume 632, Number 1 . June 22, 2005. doi : 10.1086 / 432901 .
  10. ↑ DE Trilling et al 2008 ApJ 674 1086: Debris Disks around Sun-like Stars . In: The Astrophysical Journal, Volume 674, Number 2 . October 27, 2007. doi : 10.1086 / 525514 .