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HR 6848

HR 6848 DoubleStar Sagittarius (Sgr) Visible Level 5 Expert level - Requires steady seeing
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Physical Properties

Magnitude 6.84
Spectral Type B0Ib
Star Color Yellow-white (B-V 0.31)
Distance 163 ly

Position & Identifiers

RA 18h 18m 43.3s
Dec -18° 37' 10.0"
Constellation Sagittarius (Sgr)
HR 6848
Double Cat 11240

Visibility

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Multiple Star System

Components 5
Component IDs AB
Separation 0.5″
Companion Mag 8.2
Position Angle 138°
Star Colors A: Yellow-white B: Yellow
Discoverer BU 639

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 138° A (6.8) B (8.2)

Sep: 0.5″ · PA: 138° · N up, E left

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

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Spectral Classification

Hertzsprung-Russell Diagram

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Stellar Notes

AB binary. C, 8.0v B0.5Ib at 18", vsini 42k/s.
Sgr OB4; exciting star of HII region S41; within 0.5d of S39.

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