Iota Hor

Summary

Visual magnitude: 5.40
Distance: 57.4 +/- 1.8 light years
Luminosity: 1.74 +/- 0.11 x Sun's luminosity

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

Apparent RA (epoch of date):	02h 42m 33.70s
Apparent Dec (epoch of date):	-50° 48' 23.6"
Constellation: Horologium

Altitude:	-3° 55' 9"
Azimuth:	195° 50' 15"

Transit:		22h 14m 15s
The star is never visible from the current location

Names and Catalog Numbers

Bayer letter:		? Horologii
Tycho catalog number:	TYC 8056-1164-1
PPM number:		PPM 332074
Henry Draper number:	HD 17051
DM number:		CD --51 00641
DM number:		CPD --51 00330

Star Atlas Chart Numbers

Herald-Bobroff Astroatlas, Chart C-73
Millennium Star Atlas, Charts 443-444 (Vol I)
Sky Atlas 2000.0, Chart 24
Uranometria 2000 Chart 389, Vol 2

Tycho Catalog Data

Tycho Catalogue (ESA SP-1200, 1997).

Tycho Identifier/Proximity Flag

Catalog number: TYC 8056-1164-1

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:	02h 42m 33.4682s
Dec:	-50° 48' 01.028"

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

RA:	0.0015 arcsec
Dec:	0.0014 arcsec

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

Trigonometric parallax: 0.05680 arcsec
Standard error of the parallax: 0.00180 arcsec

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

RA:	+0.53100 arcsec/yr
Dec:	+0.22250 arcsec/yr

Standard errors of the proper motion components

RA:	0.03090 arcsec
Dec:	0.02377 arcsec

Number of accepted data points: 164
Goodness-of-fit parameter, F2: -0.83

Hipparcos catalog number: 12653

Astrometric quality flag: 1 (very high).
Signal-to-noise ratio of the star image, Fs: 13.1

Source of astrometric data: Standard data processing.

Photometric Data

Mean Bt magnitude: 6.090
Standard error: 0.003

Mean Vt magnitude: 5.465
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: 0.570
Standard error: 0.003

Number of transits used in mean photometry: 174
Vt scatter, s: 0.024 mag
Vt magnitude at maximum luminosity: 5.44
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 332074
HD identifier: HD 17051
DM identifier: CD --51 00641
DM identifier: CPD --51 00330








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