70 Virginis

Summary

Visual magnitude: 4.97
Distance: 72.5 +/- 10.6 light years
Luminosity: 4.12 +/- 1.29 x Sun's luminosity

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

Apparent RA (epoch of date):	13h 28m 24.58s
Apparent Dec (epoch of date):	+13° 46' 44.8"
Constellation: Virgo

Altitude:	-22° 8' 34"
Azimuth:	46° 49' 1"

Rise:		2h 12m 2s
Transit:		9h 2m 16s
Set:		15h 52m 31s

Names and Catalog Numbers

Flamsteed number:	70 Virginis
Tycho catalog number:	TYC 898-1042-1
PPM number:		PPM 129843
Henry Draper number:	HD 117176
DM number:		BD +14 2621 

Star Atlas Chart Numbers

Herald-Bobroff Astroatlas, Chart C-47
Millennium Star Atlas, Charts 721-722 (Vol II)
Sky Atlas 2000.0, Chart 14
Uranometria 2000 Chart 195, Vol 1

Tycho Catalog Data

Tycho Catalogue (ESA SP-1200, 1997).

Tycho Identifier/Proximity Flag

Catalog number: TYC 898-1042-1

Proximity flag: None

Descriptor

V magnitude: 4.97
Source of V magnitude: Johnson UBV photometric system.

Astrometric Data

Equatorial coordinates (epoch J2000.0, ICRS)

RA:	13h 28m 25.8082s
Dec:	+13° 46' 43.618"

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

RA:	0.0067 arcsec
Dec:	0.0044 arcsec

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

Trigonometric parallax: 0.04500 arcsec
Standard error of the parallax: 0.00770 arcsec

Proper motion components (epoch J1991.25, ICRS)

RA:	-0.24351 arcsec/yr
Dec:	-0.57860 arcsec/yr

Standard errors of the proper motion components

RA:	0.0077 arcsec
Dec:	0.0049 arcsec

Number of accepted data points: 68
Goodness-of-fit parameter, F2: 6.98

Hipparcos catalog number: 65721

Astrometric quality flag: 2 (very high).
Signal-to-noise ratio of the star image, Fs: 10.1

Source of astrometric data: Standard data processing.

Photometric Data

Mean Bt magnitude: 5.854
Standard error: 0.004

Mean Vt magnitude: 5.050
Standard error: 0.003

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: 0.711
Standard error: 0.004

Number of transits used in mean photometry: 111
Vt scatter, s: 0.030 mag
Vt magnitude at maximum luminosity: 5.02
Vt magnitude at minimum luminosity: 5.08

Previously known or suspected variability: None.

Variability of the Tycho measurements: Apparent variability in the Tycho data; this may be due to duplicity, and this flag is only set if an indication of duplicity was also found.

Unresolved duplicity status: Weak indication of duplicity, combined with indication of variability.

Cross-identification and Notes

PPM identifier: PPM 129843
HD identifier: HD 117176
DM identifier: BD +14 2621 








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