Gl 581 15 16 50 -07 32.4 1.224 256.3 -9.4 dM5 W 10.56 +1.60 +1.23 +1.10 157.9 06.5 157.9 06.5 11.55 a -22 -30 +8 BD-07 4003

Key to the above data:

V/70A Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
==========================================================
Preliminary Version of the Third Catalogue of Nearby Stars
Gliese W., Jahreiss H.
<Astron. Rechen-Institut, Heidelberg (1991)>
==========================================================

Description:
The present version of the CNS3 contains all known stars within
25 parsecs of the Sun. It depends mainly on a preliminary version
(Spring 1989) of the new General Catalogue of Trigonometric
Parallaxes (YPC) prepared by Dr. William F. van Altena (Yale
University).

The catalogue contains every star with trigonometric parallax
greater than or equal to 0.0390 arcsec, even though it may be
evident from photometry or for other reasons that the star has a
larger distance. For red dwarf stars, new color-magnitude
calibrations for broad-band colors were carried out and applied.
For white dwarfs, the recipes of McCook and Sion were applied
(=1985ApJS...65..603M). Stroemgren photometry was used (not yet
systematically) for early-type stars and for late dwarfs, the
latter supplied by E. H. Olsen from Copenhagen Observatory
(private communication).

Contrary to the CNS2 (Gliese 1969) trigonometric parallaxes
and photometric or spectroscopic parallaxes were not combined.
The resulting parallax in the present version is always the
trigonometric parallax -- if the relative error of the
trigonometric parallax is smaller than 14 percent. The resulting
parallax is the photometric or spectroscopic parallax only if no
trigonometric parallax is available or if the standard error of
the trigonometric parallax is considerably larger.

Nomenclature Note:
All new nearby stars have not been numbered, and only "NN" appears in
the column "Name". There are therefore problems to designate these new
stars, as e.g. in Reference =1994ApJS...93..287W . It is recommended
for such stars to use one of the alternate designations from columns
"Giclas", "LHS", "OtherName" or "Remarks".
NOTE ADDED IN DECEMBER 1997: However, the usage found in the
literature led to add a number for these "NN" stars,
starting from 3001 (for star #2), 3002 (for star #4), etc,
and ending with NN 4388.

File Summary:

Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
1- 8 A8 --- Name *Identifier ; see remarks.
9- 10 A2 --- Comp Components (A,B,C,... )
11 A1 --- DistRel *[pqsx] Reliability of the distance
13- 14 I2 h RAh ? Right Ascension B1950 (hours)
16- 17 I2 min RAm ? Right Ascension B1950 (minutes)
19- 20 I2 s RAs ? Right Ascension B1950 (seconds)
22 A1 --- DE- Declination B1950 (sign)
23- 24 I2 deg DEd ? Declination B1950 (degrees)
26- 29 F4.1 arcmin DEm ? Declination B1950 (minutes)
31- 36 F6.3 arcsec/yr pm ? Total proper motion
37 A1 --- u_pm Uncertainty flag (:) on pm
38- 42 F5.1 deg pmPA ? Direction angle of proper motion
44- 49 F6.1 km/s RV ? Radial velocity
51- 53 A3 --- n_RV *Remark on RV
55- 66 A12 --- Sp Spectral type or color class
67 A1 --- r_Sp *Selected sources
68- 73 F6.2 mag Vmag Apparent magnitude
74 A1 --- r_Vmag *Note on origin of magnitude
75 A1 --- n_Vmag [J] joint magnitude
76- 80 F5.2 mag B-V ? color
81 A1 --- r_B-V *Note on origin of magnitude
82 A1 --- n_B-V *Joint color
83- 87 F5.2 mag U-B ? color
88 A1 --- r_U-B *Note on origin of magnitude
89 A1 --- n_U-B *Joint color
90- 94 F5.2 mag R-I ? color
95 A1 --- r_R-I *Note on origin of magnitude
96 A1 --- n_R-I *Joint color
97-102 F6.1 mas trplx ? Trigonometric parallax
103-107 F5.1 mas e_trplx ? Standard error of trig. parallax
109-114 F6.1 mas plx ? Resulting parallax
115-119 F5.1 mas e_plx ? Standard error of res. parallax
120 A1 --- n_plx *[rwsop] Code on plx
122-126 F5.2 mag Mv Absolute visual magnitude
127-128 A2 --- n_Mv Note on Mv, copied from cols 74-75
129 A1 --- q_Mv *[a-f] Quality of absolute magnitude
132-135 I4 km/s U ? U space velocity component in the galactic
plane and directed to the galactic center
137-140 I4 km/s V ? V space velocity component in the galactic
plane and in the direction of galactic
rotation
142-145 I4 km/s W ? W space velocity component in the galactic
plane and in the direction of the
North Galactic Pole
147-152 I6 --- HD [15/352860]? designation
154-165 A12 --- DM Durchmusterung number BD / CD / CP
167-175 A9 --- Giclas number <...>
177-181 A5 --- LHS number <...>
183-187 A5 --- OtherName *Other designations
189-257 A69 --- Remarks Additional identifications (LTT, LFT,
Wolf, Ross, etc.) and remarks