Observe
1Physical Properties
Magnitude
3.31
Range
3.30 - 3.31
Period
11.4 hours
Variable Type
Variable (Unclassified)
Spectral Type
A2Vn
Star Color
White
(B-V 0.08)
Distance
80 ly
Position & Identifiers
RA
12h 15m 25.6s
Dec
+57° 01' 57.0"
Constellation
Ursa Major
(UMa)
HR
4660
HIP
59774
HD
106591
Bayer
Delta
Flamsteed
69 UMa
Querying VizieR catalog...
2How easy to split?
Primary
3.3 mag
Companion
10.2 mag
Separation
181.9″
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| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium+ | Medium | Hard+ |
| 150 mm Newton 150mm Newt. | Easy | 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
3Visibility
Set a location in User Settings to see visibility data.
Best season
Feb – Apr
(peak: Mar)
4Light Curve
5Multiple Star System optical
Components
3
Component IDs
AB
Separation
181.9″
Companion Mag
10.2
Position Angle
75°
Star Colors
A: White
Discoverer
BLL 29
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
A: 3.3 · B: 10.2 · Sep: 181.9″ · PA: 75° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Explore
7
Size Comparison
Querying VizieR for stellar data…
8
Compare Stars
9
Stellar Lifecycle
10
Spectral Classification
11
Hertzsprung-Russell Diagram
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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
"Dipper Stars"; Ursa cluster; Sirius group; UMa stream.
MEGREZ; Kaffa in Becvar.
16
Light Travel Time Machine
17
Relativistic Travel
Survey Image
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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 4271
Elliptical galaxy
Galaxy
mag 13.0
0.6°
Ursa Major
Z UMa
Mira-type variable, range 6.2–9.7
Variable Star
mag 6.20
2.7°
Ursa Major
M97
Owl Nebula
Planetary nebula — try an OIII filter
Planetary Nebula
mag 9.9
8.7°
Ursa Major
Mizar
Zeta UMa (BS5054)
Easy double, sep 14.4″
Double Star
mag 2.27
9.8°
Ursa Major
