Psi Crateris — Double Star in Crater

Magnitude 6.1^m DoubleStar Crater (Crt) Visible

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Observe

1Physical Properties

Magnitude 6.13

Spectral Type A0V

Star Color Blue-white (B-V -0.01)

2Position & Identifiers

RA 11h 12m 30.4s

Dec -18° 30' 00.0"

Constellation Crater (Crt)

HR 4347

HIP 54742

HD 97411

SAO 156528

Bayer Psi

Double Cat 8086

3How easy to spot?

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Equipment	Bortle 3	Bortle 4	Bortle 5
Naked eye Naked eye	Hard	Hard	V. hard+
50 mm finder 50mm finder	Easy	Easy	Easy
150 mm telescope 150mm scope	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Feb – Apr (peak: Mar)

5Multiple Star System

Separation 0.2″

Companion Mag 8.3

Position Angle 312°

Star Colors A: Blue-white B: Yellow-white

Discoverer BU 220

Notes

6.7 B9V, 7.1 A1V, 233.0y, a = 0.383". Astrometric binary. Combined mag., colors.

Separation over time

Period: 365.7 y Eccentricity: 0.434 Now: 0.19", PA 303° -0.03" in 5 years

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

Explore

6

Size Comparison

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Compare Stars

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Spectral Classification

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Hertzsprung-Russell Diagram

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

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

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

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Stellar Fusion

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

Bright spiral galaxy

Galaxy mag 12.16 2.8° Crater

Colorful double, sep 4.4″

Double Star mag 4.08 3.1° Crater

Mira-type variable, range 6.0–12.3

Variable Star mag 6.00 5.6° Hydra

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