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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesYes—you can photograph some globular clusters in other galaxies with backyard equipment. Start with bright targets in Andromeda (M31) or Triangulum (M33): the reported examples G76 and C39 have both been imaged with a 3-inch telescope. In a typical amateur image, however, a distant cluster appears as a pinpoint, not a resolved ball of individual stars. Check any candidate against a catalog or annotated chart before calling it a confirmed cluster.
Choose a bright target that suits your setup
For a first attempt, favor a cluster that is both relatively bright and distinguishable from the background of its host galaxy. The following aperture figures are examples reported by astro-imager Rod Pommier in Astronomy.com’s guide to imaging star clusters in other galaxies, not guaranteed minimums or results from a controlled equipment comparison.
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| Galaxy | Distance or context | Target to try | Reported aperture example | What to expect |
|---|---|---|---|---|
| M31, Andromeda | About 2.5 million light-years, according to NASA. | G76; G279 is another cited target. | G76 has been imaged with a 3-inch telescope. | Best starting galaxy in Pommier’s account. G76 lies above the star cloud NGC 206. M31 covers a large apparent area, so his imaging used separate north, center, and south frames. |
| M33, Triangulum | About 2.8 million light-years, as reported in Pommier’s guide. | C39. | C39 has been captured with a 3-inch telescope. | Other candidates can be harder to distinguish because they sit over the galaxy’s spiral-arm background. |
| M81 | Nearly 12 million light-years, as reported in Pommier’s guide. | GC1. | A 5-inch telescope is the reported example. | A more difficult step than M31 or M33. |
| M104 | About 30 million light-years, as reported in Pommier’s guide. | Several candidates. | Medium aperture; an exact size is not stated in the guide. | Some halo objects that resemble clusters are planetary nebulae. |
| M87 | 55 million light-years, as reported in Pommier’s guide. | Several bright halo candidates. | Not stated in the guide. | Pommier counted more than 150 starlike objects in his image; he reported that nearly all were globular clusters, with a few planetary nebulae. This is his count, not an independently verified amateur census. |
The 3-inch and 5-inch examples describe particular targets and an author’s imaging experience. They do not establish that the same telescope will work from every site. Pommier says results vary with aperture, sky conditions, and exposure time; seeing, tracking, image scale, camera, and processing also affect what an image records. His examples include a 17-inch f/6.8 telescope under Bortle 7 skies, but the guide does not provide a reproducible camera-setting recipe or a controlled comparison.
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The available examples support target selection, not a universal exposure plan. No camera model, exposure duration, focal length, tracking specification, or processing workflow is established for these targets. Use your imaging setup’s normal capture workflow, and judge the result against the target’s cataloged position rather than assuming a certain exposure or aperture guarantees a detection.
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- Pick a target and reference chart. Start with M31 G76 or M33 C39, and obtain an annotated chart or catalog entry that lets you check the cluster’s position relative to nearby stars and host-galaxy features.
- Frame the host galaxy appropriately. M31 is broad in the sky; Pommier split it into north, center, and south frames at his focal length. Use framing that places the selected target in the image without assuming one composition suits every telescope.
- Capture and inspect the field. An apparent pinpoint is a candidate, not proof. Compare its location to the reference after imaging.
- Label conservatively. If the position does not match a reliable reference, or you cannot distinguish likely alternatives, do not identify it as a confirmed globular cluster.
Know what a backyard image can establish
At amateur imaging resolution, an extragalactic globular cluster generally looks like a point of light. That is detection, not resolution: the image does not show the cluster’s individual member stars. NASA explains the difference with its much more capable Hubble observations of M31. The galaxy is about 2.5 million light-years away, yet NASA says Hubble can resolve individual stars in a 61,000-light-year-long stretch of its disk. NASA’s PHAT mosaic combined 7,398 exposures from 411 telescope pointings and revealed more than 100 million stars and thousands of clusters in the imaged section. Those figures describe a large Hubble program, not what a backyard telescope can reproduce.
Some globular clusters are themselves substantial systems: NASA describes M31’s G1, also called Mayall II, as containing at least 300,000 old stars. That scale helps explain why an apparent point can be a cluster, but the appearance alone cannot confirm it.
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Check a candidate before identifying it
A point-like source at the expected distance can be mistaken for several other objects. Possible look-alikes include foreground Milky Way stars, stars or open clusters within the host galaxy, planetary nebulae, and distant background galaxies. Compare the position with an astronomical catalog or an annotated chart before attaching a cluster name to an image.
Scientific identification takes more than appearance. Pommier describes using B, R, and V photometry and then spectroscopy to assess candidates. In the criteria he reports, a B–V color index of at least 0.6 supports a globular-cluster identification; a V–R index similar to Milky Way globulars adds support; a redshift consistent with the parent galaxy helps distinguish it from a distant background galaxy; and low iron-to-hydrogen abundance is consistent with an old cluster. These are measurements used in identification, not visual tests an amateur image alone can perform.
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When to move beyond the easiest targets
After trying a bright cluster in M31 or M33, M81’s GC1 is a more demanding target, with a 5-inch scope cited as an example in Pommier’s guide. M104 and M87 extend the challenge further, but the guide gives no exact aperture threshold for either. In particular, treat apparent objects around M104 and M87 carefully: planetary nebulae can be mixed among sources that look like globulars. For every galaxy, the useful question is not simply whether a telescope has enough aperture, but whether the target can be recorded against its background and independently checked by position or other evidence.
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