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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

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  1. Targets
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  3. NGC 4100

 

NGC 4100

Set a site to see tonight's sky

When NGC 4100 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

A gravitationally bound system of stars, gas and dust.

Class explainer for galaxy (catalogue type). SIMBAD files it under 'GiG' (galaxy in a group).

The facts

NGC 4100 is a galaxy in Ursa Major. SIMBAD gives its distance as 20.8 Mpc (−4.2 Mpc / +4.2 Mpc) — ≈ 67,800,000 ly, measured by the Tully–Fisher relation from 10+ measurements. The light reaching us from it now left it about 67.8 million years ago, while dinosaurs walked the Earth. SIMBAD measures it at 5.1′ × 1.5′ on the sky — 17% of the full Moon's width. At that distance, that angle means it is roughly 101,000 light-years across. Framing uses its catalogue size instead: 4.6′. It is receding from us at about 1,074 km/s (redshift z = 0.0036). Its morphological type is SAbc. It shines at magnitude 11.1.

Sources: AstroBrain catalogue; CDS/SIMBAD astronomical database, Strasbourg (SIMBAD record NGC 4100 · distance from 2022MNRAS.511.6160K). 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′NGC 4100 · 5.1′
Angular size, as it would sit on your sky.
Milky Way · ~100,000 lyNGC 4100 · ~101,000 ly
True width compared with our Galaxy's disc (≈100,000 ly, a round figure).

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 40881.0° away
  • NGC 41571.2° away
  • NGC 40261.7° away
  • NGC 40962.1° away
  • NGC 42202.4° away
  • NGC 39492.7° 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.

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