Rho Corona borealis

Summary

Visual magnitude: 5.40
Distance: 57.7 +/- 2.7 light years
Luminosity: 1.76 +/- 0.17 x Sun's luminosity

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

Apparent RA (epoch of date):	16h 01m 00.60s
Apparent Dec (epoch of date):	+33° 18' 12.0"
Constellation: Corona Borealis

Altitude:	-16° 4' 30"
Azimuth:	5° 8' 16"

Rise:		3h 15m 25s
Transit:		11h 34m 27s
Set:		19h 53m 30s

Names and Catalog Numbers

Bayer letter:		? Coronae Borealis
Flamsteed number:	15 Coronae Borealis
Tycho catalog number:	TYC 2576-2228-1
PPM number:		PPM 78975
Henry Draper number:	HD 143761
DM number:		BD +33 2663 

Star Atlas Chart Numbers

Herald-Bobroff Astroatlas, Chart C-27
Millennium Star Atlas, Charts 1159-1160 (Vol III)
Sky Atlas 2000.0, Chart 8
Uranometria 2000 Chart 113, Vol 1

Tycho Catalog Data

Tycho Catalogue (ESA SP-1200, 1997).

Tycho Identifier/Proximity Flag

Catalog number: TYC 2576-2228-1

Proximity flag: None

Descriptor

V magnitude: 5.40
Source of V magnitude: Johnson UBV photometric system.

Astrometric Data

Equatorial coordinates (epoch J2000.0, ICRS)

RA:	16h 01m 02.6621s
Dec:	+33° 18' 12.574"

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

RA:	0.0028 arcsec
Dec:	0.0018 arcsec

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

Trigonometric parallax: 0.05650 arcsec
Standard error of the parallax: 0.00280 arcsec

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

RA:	-0.23460 arcsec/yr
Dec:	-0.77980 arcsec/yr

Standard errors of the proper motion components

RA:	0.04505 arcsec
Dec:	0.01123 arcsec

Number of accepted data points: 102
Goodness-of-fit parameter, F2: 1.10

Hipparcos catalog number: 78459

Astrometric quality flag: 1 (very high).
Signal-to-noise ratio of the star image, Fs: 10.5

Source of astrometric data: Standard data processing.

Photometric Data

Mean Bt magnitude: 6.142
Standard error: 0.003

Mean Vt magnitude: 5.469
Standard error: 0.002

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: 0.608
Standard error: 0.003

Number of transits used in mean photometry: 159
Vt scatter, s: 0.023 mag
Vt magnitude at maximum luminosity: 5.45
Vt magnitude at minimum luminosity: 5.49

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 78975
HD identifier: HD 143761
DM identifier: BD +33 2663 








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