HD 217107

Summary

Visual magnitude: 6.17
Distance: 72.8 +/- 4.9 light years
Luminosity: 1.37 +/- 0.19 x Sun's luminosity

Position information for 01 ene 2000 0:00:00
(Julian day number 2451544.41667)

Apparent RA (epoch of date):	22h 58m 14.09s
Apparent Dec (epoch of date):	-2° 23' 49.4"
Constellation: Pisces

Altitude:	+4° 58' 56"
Azimuth:	262° 42' 37"

Rise:		12h 36m 43s
Transit:		18h 30m 32s
Set:		0h 28m 20s

Names and Catalog Numbers

Tycho catalog number:	TYC 5235-1468-1
PPM number:		PPM 206984
Henry Draper number:	HD 217107
DM number:		BD --3 5539 

Star Atlas Chart Numbers

Herald-Bobroff Astroatlas, Chart C-40
Millennium Star Atlas, Charts 1281-1282 (Vol III)
Sky Atlas 2000.0, Chart 17
Uranometria 2000 Chart 258, Vol 1 and 2

Tycho Catalog Data

Tycho Catalogue (ESA SP-1200, 1997).

Tycho Identifier/Proximity Flag

Catalog number: TYC 5235-1468-1

Proximity flag: None

Descriptor

V magnitude: 6.17
Source of V magnitude: Johnson UBV photometric system.

Astrometric Data

Equatorial coordinates (epoch J2000.0, ICRS)

RA:	22h 58m 15.5378s
Dec:	-2° 23' 43.384"

Standard errors of the equatorial coordinates (epoch J1991.25)

RA:	0.0030 arcsec
Dec:	0.0022 arcsec

Astrometric reference flag: This is a recommended astrometric reference star, having good Tycho astrometric quality, and not  recognised as double.

Trigonometric parallax: 0.04480 arcsec
Standard error of the parallax: 0.00320 arcsec

Proper motion components (epoch J1991.25, ICRS)
(Data is from the ACT catalog)

RA:	-0.01140 arcsec/yr
Dec:	-0.01570 arcsec/yr

Standard errors of the proper motion components

RA:	0.00206 arcsec
Dec:	0.00292 arcsec

Number of accepted data points: 85
Goodness-of-fit parameter, F2: -0.84

Hipparcos catalog number: 113421

Astrometric quality flag: 1 (very high).
Signal-to-noise ratio of the star image, Fs: 9.4

Source of astrometric data: Standard data processing.

Photometric Data

Mean Bt magnitude: 7.104
Standard error: 0.005

Mean Vt magnitude: 6.256
Standard error: 0.005

Source of photometric data: The Bt,Vt data are median values, rather than de-censored mean values (mainly relevant for bright stars with Bt<=8.5 mag and Vt<=8.0 mag).

Johnson B-V colour index: 0.746
Standard error: 0.006

Number of transits used in mean photometry: 87
Vt scatter, s: 0.036 mag
Vt magnitude at maximum luminosity: 6.22
Vt magnitude at minimum luminosity: 6.29

Previously known or suspected variability: None.

Variability of the Tycho measurements: None.

Unresolved duplicity status: An investigation was carried out on the Tycho data, but no indication of duplicity was found.

Cross-identification and Notes

PPM identifier: PPM 206984
HD identifier: HD 217107
DM identifier: BD --3 5539 








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