47 Ursa majoris

Summary

Visual magnitude: 5.03
Distance: 45.3 +/- 1.2 light years
Luminosity: 1.52 +/- 0.08 x Sun's luminosity

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

Apparent RA (epoch of date):	10h 59m 27.46s
Apparent Dec (epoch of date):	+40° 25' 39.4"
Constellation: Ursa Major

Altitude:	+19° 29' 7"
Azimuth:	52° 56' 3"

Rise:		21h 19m 30s
Transit:		6h 33m 44s
Set:		15h 44m 2s

Names and Catalog Numbers

Flamsteed number:	47 Ursae Majoris
Tycho catalog number:	TYC 3009-2703-1
PPM number:		PPM 52175
Henry Draper number:	HD 95128
DM number:		BD +41 2147 

Star Atlas Chart Numbers

Herald-Bobroff Astroatlas, Chart C-31
Millennium Star Atlas, Charts 615-616 (Vol II)
Sky Atlas 2000.0, Chart 6
Uranometria 2000 Chart 73, Vol 1

Tycho Catalog Data

Tycho Catalogue (ESA SP-1200, 1997).

Tycho Identifier/Proximity Flag

Catalog number: TYC 3009-2703-1

Proximity flag: None

Descriptor

V magnitude: 5.03
Source of V magnitude: Johnson UBV photometric system.

Astrometric Data

Equatorial coordinates (epoch J2000.0, ICRS)

RA:	10h 59m 27.9737s
Dec:	+40° 25' 48.944"

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

RA:	0.0017 arcsec
Dec:	0.0015 arcsec

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

Trigonometric parallax: 0.07200 arcsec
Standard error of the parallax: 0.00200 arcsec

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

RA:	-0.41505 arcsec/yr
Dec:	+0.05720 arcsec/yr

Standard errors of the proper motion components

RA:	0.00139 arcsec
Dec:	0.00083 arcsec

Number of accepted data points: 127
Goodness-of-fit parameter, F2: -0.59

Hipparcos catalog number: 53721

Astrometric quality flag: 1 (very high).
Signal-to-noise ratio of the star image, Fs: 11.7

Source of astrometric data: Standard data processing.

Photometric Data

Mean Bt magnitude: 5.791
Standard error: 0.003

Mean Vt magnitude: 5.102
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: 0.620
Standard error: 0.003

Number of transits used in mean photometry: 119
Vt scatter, s: 0.025 mag
Vt magnitude at maximum luminosity: 5.07
Vt magnitude at minimum luminosity: 5.12

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 52175
HD identifier: HD 95128
DM identifier: BD +41 2147 








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