When is the best time to observe Xi Lupi?

Xi Lupi is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is Xi Lupi located in the sky?

Xi Lupi lies in the constellation Lupus at right ascension 15h 57m and declination -33° 58′.

What telescope do I need to split Xi Lupi?

Splitting Xi Lupi requires an aperture of roughly 60 mm or larger — the components are separated by about 10.2″ at magnitudes near 5.1. Larger apertures and steady seeing help resolve the pair cleanly.

Xi Lupi — Double Star in Lupus

HIP 78105; Xi Lupi

Observable Double Star Excellent (69/100)

Sep: 10.2", Companion: mag 5.6

Magnitude 5.1^m DoubleStar Lupus (Lup) Visible

Star Map + List + Plan Star Hop

Observe

1Physical Properties

Magnitude 5.12

Spectral Type A3V

Star Color White (B-V 0.12)

Distance 130 ly

2Position & Identifiers

RA 15h 56m 53.5s

Dec -33° 57' 59.0"

Constellation Lupus (Lup)

HR 5925

HIP 78105

HD 142629

SAO 207144

Bayer Xi

SIMBAD Wikipedia

3How easy to split?

Primary 5.1 mag Companion 5.6 mag Separation 10.2″

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	Easy
150 mm Newton 150mm Newt.	Easy	Easy	Easy
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 Apr – Jun (peak: May)

5Multiple Star System

Separation 10.2″

Companion Mag 5.6

Companion Sp B9V

Position Angle 50°

Star Colors A: White B: Blue-white

Discoverer PZ 4

Notes

Binary with HR 5926. Mag. and color for combined light, 4.585V, +0.09(B-V), +0.07(U-B).

Separation over time

Measured 1826 → 2020 (194 y)

Separation drift 11.7" → 10.2" (-1.50")

Rate -0.0077" / y

PA drift 53° → 50° (-3°, -0.015°/y)

Slow change over generations — observable in lifetime comparisons.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.