HD 20794

C.D.S. - SIMBAD4 rel 1.7 - 2018.12.09CET21:48:07

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
* e Eri -- High proper-motion Star
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,AC2000,...), PM* (LHS,Ci,...), IR (AKARI,IRAS,...), UV (TD1), X (1RXS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
03 19 55.6509352 -43 04 11.217495 (Optical) [ 0.15 0.15 90 ] A 2007A&A...474..653V
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK5 coord. (ep=J2000 eq=2000) :
03 19 55.6509352 -43 04 11.217495 [ 0.15 0.15 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
03 17 55.8500928 -43 15 35.906077 [ 10.50 10.00 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
250.7461712504 -56.0768659495 [ 0.15 0.15 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
3038.34 726.58 [0.20 0.21 90] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 87.90 [0.43] / z(spectroscopic) 0.000293 [0.000001] / cz 87.91 [0.43]
   (Opt) A 2018yCat.1345....0G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
165.47 [0.19] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
G6V B 1989ApJS...71..245K
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (9) :
U 5.20 [~] C 2002yCat.2237....0D
B 4.98 [~] C 2002yCat.2237....0D
V 4.27 [~] C 2002yCat.2237....0D
R 3.65 [~] C 2002yCat.2237....0D
I 3.25 [~] C 2002yCat.2237....0D
G 3.9814 [0.0037] C 2018yCat.1345....0G
J 2.99 [~] C 2002yCat.2237....0D
H 2.60 [~] C 2002yCat.2237....0D
K 2.53 [~] C 2002yCat.2237....0D
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within radius arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
Some important notes on this object about identifications and objects associations.
notes:


Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

The count displayed here is the number of children objects.
The list obtained by clicking the button may be larger, as some children may be linked with different references or probability.

%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

: 6
Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (43) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

LHS 19 GCRV 1851 LPM 147 SKY# 4999
* e Eri GEN# +1.00020794 LTT 1583 SPOCS 162
* 82 Eri GJ 139 2MASS J03195563-4304112 TD1 2110
AC2000 3488626 HD 20794 N30 684 TYC 7567-1183-1
AKARI-IRC-V1 J0319577-430406 HIC 15510 NLTT 10637 UBV 3229
CD-43 1028 HIP 15510 PLX 703 UBV M 9464
Ci 20 227 HR 1008 PLX 703.00 uvby98 100020794
CPC 0 1580 IRAS 03180-4315 PM 03179-4316 WEB 2978
CPD-43 354 IRAS F03180-4315 PPM 307533 Zkh 50
FK5 119 JP11 773 1RXS J031954.5-430417 Gaia DR2 4847957293277762560
GC 4000 LFT 277 SAO 216263

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References (61 between 2014 and 2019) (Total 366)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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                Reference summaries :

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                 or select by : (not exhaustive, explanation here)


Collections of Measurements


distance : 1    velocities : 22    ROT : 2    PM : 8    Fe_H : 42    PLX : 4    MK : 18   

   

Warning : measurements from IRAS, IRC, SAO, CL.g (ACO), GJ have been removed
(they are still available using the icon Vizier near the identifier of the catalogue, or at the bottom of the page in the section "External links" to get the full data)

distance (1)

 | distance Q unit|  err-        err+     | method |     reference     |
 -----------------------------------------------------------------------
 |    6.0038  pc  |  -0.0084     +0.0084  |paral   |2018yCat.1345....0G|
 

velocities (22)

 |typ|    Value    R   m.e.   |A (Nmes)|na,Q,dom ,   res    D| Obs.date | Rem.  |Or|     Reference     |
 -------------------------------------------------------------------------------------------------------
 |v  |   87.90        0.43    |A (  12)|s , ,O   ,           |          |       |  |2018yCat.1345....0G|
 

rot (2)

 |  Vsini  [  err   ] (mes)|Q|     reference     |
 -------------------------------------------------
 |   0.18  [        ] (   )| |2010A&A...520A..79M|
 

pm (8)

 |  pm-ra  [   m.e   ]|  pm-de  [   m.e   ]|syst|     reference     |
 --------------------------------------------------------------------
 |+3033.728[    0.505]| +730.775[    0.621]|ICRS|2018yCat.1345....0G|
 

fe_h (42)

 |Teff  log.g | Fe_H  c|CompStar |CatNo|     Reference     |
 -----------------------------------------------------------
 | 5663 4.50  | 0.00   |SUN      |     |1981A&A...100...97G|
 

plx (4)

 |    plx    :    m.e     R |     reference     |
 ------------------------------------------------
m| 165.02    :   0.55       |1997A&A...323L..49P|
 

mk (18)

 |ds/mss|           Spectral type            |     reference     |
 -----------------------------------------------------------------
 |  /   |G8V                                 |2006AJ....132..161G|
 
Observing logs


ISO : 4    herschel : 4    IUE : 70   

   

Warning : measurements from IRAS, IRC, SAO, CL.g (ACO), GJ have been removed
(they are still available using the icon Vizier near the identifier of the catalogue, or at the bottom of the page in the section "External links" to get the full data)

iso (4)

The 2 columns in color are computed by VizieR, and are not part of the original data.
Note: Quick-look images of the data, and specific documentation, are accessible by clicking on the TDT observation identifier
VI/111/isolog
Post annotation
ISO Observation Log (ISO Data Centre, 2004) [ReadMe+ftp]

*The ISO Observation Log (36737 rows) (Note)
img(gal)
start AladinLite

Full _r TDT AOT minLam maxLam Target oStart oLen recno FOV RAJ2000 DEJ2000 cal ObsID abs PropID arcmin um um s s deg deg
1 0.097 74901503 PHT22 54.76 71.44 HD 20794 1997-12-03T23:13:31 1542 31457 227"x227" 049.9797 -43.0701 CWAELKEN + GDWARFS 2 0.109 79100911 PHT40 2.47 8.95 HD 20794 1998-01-15T03:53:45 172 32859 24"x24" 049.9794 -43.0700 FCRIFO + 1180_A 3 0.109 79100912 PHT03 3.08 4.04 HD 20794 1998-01-15T03:57:19 174 32860 23" D 049.9794 -43.0700 FCRIFO + 1180_A 4 0.995 79100958 PHT40 2.47 8.95 HD 20794 OF 1998-01-15T03:50:03 172 32861 24"x24" 049.9794 -43.0533 FCRIFO + 1180_A

herschel (4)

The 1 column in color are computed by VizieR, and are not part of the original data.

Note: (see also the postcard server)

VI/139/herschel
Post annotation
Herschel Observation Log (Herschel Science Centre, 2013) [ReadMe+ftp]
The Herschel Observation Log (37093 rows)
img(gal)
start AladinLite

Full _r OD Target RAJ2000 DEJ2000 Proposal AOT Dur Start ObsId PACS HIFI SPIRE Label arcmin "h:m:s" "d:m:s" s s
1 0.0000 675 P-G005 (HD 20794) 03 19 55.65 -43 04 11.2 KPOT_bmatthew_1 PacsPhoto 1686 2011-03-20T19:43:42 1342216457 get Herschel/PACS observation #1342216457 DEBRIS - PB-G005 (HD 20794) 2 0.0000 675 P-G005 (HD 20794) 03 19 55.65 -43 04 11.2 KPOT_bmatthew_1 PacsPhoto 1686 2011-03-20T19:14:33 1342216456 get Herschel/PACS observation #1342216456 DEBRIS - PA-G005 (HD 20794) 3 0.0003 945 P70-G005 (HD 20794) 03 19 55.65 -43 04 11.2 KPOT_bmatthew_1 PacsPhoto 445 2011-12-14T20:51:16 1342234097 get Herschel/PACS observation #1342234097 DEBRIS70 - PB-G005 (HD 20794) 4 0.0003 945 P70-G005 (HD 20794) 03 19 55.65 -43 04 11.2 KPOT_bmatthew_1 PacsPhoto 445 2011-12-14T20:42:48 1342234096 get Herschel/PACS observation #1342234096 DEBRIS70 - PA-G005 (HD 20794)

iue (70)

 |Homogenized Name:  ComplID   |PROG |CL|D CAM IMAGE A| FES  MD|Obs.da  Time |ExpTim|m|CEB|S|      Comments      |F|     reference     |
 ---------------------------------------------------------------------------------------------------------------------------------------
 |HD 20794        :            |OD64B|44|L SWP 15909 L|  455 FU|811231 182200|003600| |351|G|E=183,C=124,B=25    |*|1996IUEML.C......0I|
 

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : HD 20794

Link by name to the catalogue in VizieR :

LHS 19 AC2000 3488626 AKARI-IRC-V1 J0319577-430406 CD-43 1028 CPD-43 354
FK5 119 GJ 139 HD 20794 HIC 15510 HIP 15510
HR 1008 IRAS 03180-4315 IRAS F03180-4315 2MASS J03195563-4304112 NLTT 10637
PLX 703 PPM 307533 1RXS J031954.5-430417 SAO 216263 TD1 2110
TYC 7567-1183-1 uvby98 100020794 Gaia DR2 4847957293277762560

Search by coordinates in Vizier (radius: 20 arcsec)


Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
The list of all annotations to SIMBAD objects can be found here .

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2018.12.09-21:48:08

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