θ Persei (theta Persei)

Above the horizon. Rise: 3:38 | Tran: 8:51 | Set: 14:09

Alt: 8.44° Az: 36.68° Direction: South-South-West

θ Persei is a variable and multiple main-sequence star of spectral class F8 in the constellation of Perseus.

θ Persei visual magnitude is 4.12. Because of its moderate brightness, θ Persei is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of θ Persei. The red arrow shows the motion of θ Persei during the next 1000 years (5.60 arcmin in Right Ascension and -1.48 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 02h 45m 56s

Declination +49° 20’ 05”

Hour Angle 19h 39m 48s

Sidereal Time 22h 25m 44s

J2000

Right Ascension 02h 44m 12s

Declination +49° 13’ 41”

Galactic Coordinates

Galactic Longitude 141.16°

Galactic Latitude -9.61°

Finder Chart

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Finder chart for θ Persei (theta Persei).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.12

Class Main-sequence

Absolute magnitude 3.87

Spectral Type F8V

Color Index (B-V) 0.49

Temperature 6435K

The red dot in the diagram below shows where θ Persei is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ Persei. Attribution: Richard Powell / CC BY-SA

Star System Properties

θ Persei is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the θ Persei double sysyem:

Main star magnitude 4.12

Secondary star magnitude 9.72

Magnitude difference 5.6

Separation 19.6 arcsec

Distance, Radial Speed, Proper Motion

θ Persei is distant 36.62 light years from the Sun and it is moving far from the Sun at the speed of 25 kilometers per second.

Distance (parsec) 11.23

Distance (light year) 36.62

Radial Speed 25 km/s

Proper Motion RA 0.336 arcsec/y

Proper Motion Dec -0.089"/y

Alternative Designations

Bayer designation θ Persei
(theta Persei)

Flamsteed designation 13 Persei

Henry Draper Catalogue HD16895

SAO Catalogue SAO38288

Hipparcos Catalogue HIP12777

Durchmusterung Catalogue BD+48 746

Gliese Catalogue Gl 107 A

FK5 Catalogue 93

General Catalogue of Variable Stars 902

Aitken Double Star Catalogue ADS2081

Visibility from Your Location

Today's θ Persei (theta Persei) rise, transit and set times from Port Moresby, Papua New Guinea are the following (all times relative to the local timezone Pacific/Port_Moresby):

Azimuth: 40.7° RISE 3:38

Max altitude: 31.2° TRANSIT 8:51

Azimuth: 319.3° SET 14:09

Name:	Port Moresby, Papua New Guinea
Latitude:	9° 26' 35.3" S
Longitude:	147° 10' 48.0" E
Timezone:	Pacific/Port_Moresby

Set Location

Other stars in Perseus