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HIP 44248 — Double Star in Lynx

Magnitude 4.0m DoubleStar Lynx (Lyn) Visible
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1Physical Properties

Magnitude 3.97
Spectral Type F5V
Star Color Yellow-white (B-V 0.44)
Distance 47 ly

2Position & Identifiers

RA 09h 00m 38.4s
Dec +41° 46' 58.0"
Constellation Lynx (Lyn)
HR 3579
HIP 44248
HD 76943
SAO 42642
SIMBAD

3How easy to split?

Primary 4.0 mag Companion 6.5 mag Separation 0.7″
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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. V. hard V. hard V. hard
150mm Newt. V. hard+ V. hard+ V. hard+
C8 203mm V. hard+ V. hard+ V. hard+
Easy Medium Hard Very hard Impossible

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

To reach "Medium" at Bortle 3, you'd need at least a 400 mm reflector.

4Visibility

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Best season Jan – Mar (peak: Feb)

5Multiple Star System Quintuple

Components 5 (quintuple)
Component IDs AB
Separation 0.7″
Companion Mag 6.5
Companion Sp K0V
Position Angle 144°
Star Colors A: Yellow-white B: Orange
Discoverer KUI 37
AB 4.11 F5V, 6.18 G5V, 21.85y, a = 0.619". Combined mag., colors. Companions C - E optical. Masses A, 1.13; B, 0.84 | solar.

Separation over time

Period: 21.8 y Eccentricity: 0.151 Now: 0.68", PA 1° -0.23" in 5 years
0.00" 0.21" 0.42" 0.63" 0.84" 2016 2020 2024 2028 2032 2036 0.68"

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

Eyepiece View

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80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 144°

A: 4.0 · B: 6.5 · Sep: 0.7″ · PA: 144° · N up, E right

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

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7

Size Comparison

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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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

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15Stellar Notes

7980.7d, K 4.0k/s, V0 +27.2k/s, asini 434, i 134.8d.
Hyades group.
0.054".
Formerly known as 10 UMa, in Lynx.
16

Light Travel Time Machine

17

Relativistic Travel

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.

NGC 2782
Medium
Bright spiral galaxy
Galaxy mag 11.5 3.0° Lynx
38 Lyn
Medium+
Tight double — a rewarding split at 2.6″
Double Star mag 3.82 6.1° Lynx
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