When is the best time to observe Alrescha?

Alrescha is best observed from September through November, with peak visibility during October when it transits around midnight in the Northern Hemisphere.

Where is Alrescha located in the sky?

Alrescha lies in the constellation Pisces at right ascension 02h 02m and declination +02° 46′.

What telescope do I need to split Alrescha?

Splitting Alrescha requires an aperture of roughly 150 mm or larger — the components are separated by about 1.9″ at magnitudes near 4.3. Larger apertures and steady seeing help resolve the pair cleanly.

Alrescha — Double Star in Pisces

HIP 9487; Alpha Piscium; 113 Piscium

Observable Double Star Fair (30/100)

Sep: 1.9", Companion: mag 5.2

Magnitude 4.3^m DoubleStar Pisces (Psc) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.33

Variable Type Alpha2 CVn (Magnetic Rotating)

Spectral Type A0pSiSr

Star Color Blue-white (B-V 0.03)

Distance 652 ly

2Position & Identifiers

RA 02h 02m 02.8s

Dec +02° 45' 49.0"

Constellation Pisces (Psc)

HR 596

HIP 9487

HD 12446

SAO 110291

Bayer Alpha

Flamsteed 113 Psc

Double Cat 1615

SIMBAD Wikipedia

3How easy to split?

Primary 4.3 mag Companion 5.2 mag Separation 1.9″

Sign in and configure your equipment and default location to see a personalized row.

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	Hard	Hard
150 mm Newton 150mm Newt.	Medium+	Medium+	Medium+
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

Set a location in User Settings to see visibility data.

Best season Sep – Nov (peak: Oct)

5Multiple Star System

Separation 1.9″

Companion Mag 5.2

Companion Sp A3m

Position Angle 258°

Star Colors A: Blue-white B: White

Discoverer STF 202

Notes

4.18 A2p, 5.21 Am, 933.05y, a = 4.0". Colors for combined light. Combined mag. 3.82V.

Separation over time

Period: 3267.4 y Eccentricity: 0.465 Now: 1.9", PA 256° + 0.02" in 5 years

Apparent separation over time, computed from ORB6 orbital elements. Steep curves indicate fast-changing pairs — catch them while they're splittable.

Eyepiece View

Telescope Eyepiece

Log in to set your own equipment

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

A: 4.3 · B: 5.2 · Sep: 1.9″ · PA: 258° · N up, E right

Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″

Explore

7

Size Comparison

Querying VizieR for stellar data…

8

Compare Stars

Compare with another star

9

Spectral Classification

10

Hertzsprung-Russell Diagram

Loading HR diagram…

Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map

11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

14

Stellar Fusion

Discover

15Stellar Notes

Variable Star

Alpha CV?, 3.79 - 3.83V. Although the NSV identifies the variable as HR 596, the magnitudes given are for the blend of | HR 595/6; uncertain which component is the variable.

Dynamical

0.017".

Alternative Names

Alrisha; Alrischa; Alrescha; El Rischa; Al Richa; Rescha; Okda; Kaitain.

16