Skip to content
AstroBrainTarget detail
Field mode (red low-light scaffold). Click to enable.Sign in

Plan

  • Tonight
  • Night Outlook
    • Weather
  • Targets
    • Saved targets
  • Plan a night
  • Night plans
    • Logbook

Tools

  • Sky atlas
  • Field of View
  • Exposure Lab
  • Calculators
  • Horizon Studio
  • Sequence Studio
    • Nights
    • Projects

Setup

  • Settings
  • About & Support
  • What’s new

Plan

  • Tonight
  • Night Outlook
    • Weather
  • Targets
    • Saved targets
  • Plan a night
  • Night plans
    • Logbook

Tools

  • Sky atlas
  • Field of View
  • Exposure Lab
  • Calculators
  • Horizon Studio
  • Sequence Studio
    • Nights
    • Projects

Setup

  • Settings
  • About & Support
  • What’s new

Loading

Preparing AstroBrain

Loading your page…

Loading…
TargetsSaved targetsDeep-Sky Guide
Loading…
  1. Targets
  2. ›
  3. vdB 73

 

vdB 73

Set a site to see tonight's sky

When vdB 73 is up, how long it stays usable and when it is in season all depend on where you observe from. Set your site and this page adds tonight's answer and its year.

Set it on Tonight

The science

What you are looking at

In one sentence

Dust grains scattering the light of nearby stars rather than emitting their own.

Class explainer for reflection nebula (catalogue type).

The facts

vdB 73 is a reflection / dark nebula in Monoceros. SIMBAD gives its distance as 827.883 pc (−9.4583 pc / +9.4583 pc) — ≈ 2,700.19 ly, measured by parallax from 3 measurements. The light reaching us from it now left it around 675 BCE. On the sky it spans 2.8′ — 9% of the full Moon's width. At that distance, that angle means it is roughly 2 light-years across.

Sources: AstroBrain catalogue; van den Bergh S. 1966, AJ 71, 990, via CDS/VizieR VII/21; CDS/SIMBAD astronomical database, Strasbourg (SIMBAD record BD-06 1440 · distance from 2020yCat.1350....0G). Contains information from SIMBAD, which is made available here under the Open Database License (ODbL). Download the SIMBAD-derived data.

For scale

Full Moon · 31′vdB 73 · 2.8′
Angular size, as it would sit on your sky.

2 ly

across — 1× the distance from the Sun to its nearest neighbour star (4.37 ly).

The same patch of sky in visible light

  • Sky image

    Observatory photos and open-licence sky surveys.

    Credits on each image.

Neighbours in the sky

  • NGC 21850.0° away
  • NGC 21830.1° away
  • LBN 10000.1° away
  • vdB 740.2° away
  • vdB 720.4° away
  • NGC 21820.4° away

Sky maths: apparent positions with refraction, one-minute steps; usable = full astronomical dark, at least 30° up and clear of your skyline. Survey images: CDS, Strasbourg (DSS2 and other surveys). Science: SIMBAD. The hours, heights and Moon on this page use no weather forecast; the rank is this target’s place in the Targets list, whose score also counts the cloud forecast when there is one.

Loading…