Hubble 5-star Artificial Stars

Price: $27.00

Order Info


  • To accurately test and collimate telescopes, reflectors, catadioptric, and refractors, you must perform a star test. However, to do so, you need a star. Sadly, a real star is not always available due to poor weather conditions or location. Even when a star is available, you will need a good tracking system for doing star test as the star is always moving. Also air turbulence may affect your test, and the real star may not even reveal the true quality of your telescopes or give you a perfect collimation.
  • An artificial star is an excellent alternative to the real star. With an artificial star, star tests can be accurately conducted anytime and anywhere. However, the problem with the artificial star is that you need many different sizes of artificial stars for different telescopes of different apertures with different focal ratios, and even for the same telescopes but at different distances, and under different lighting environments.

  • Solution:

  • The innovative Hubble 5-star Artificial Stars is the perfect solution to the star test problem. It has 5 bright white LEDs with 5 precision pinholes (50/100/150/200/250 microns). The Hubble 5-star Artificial Stars enables you to test virtually all telescopes, regardless of aperture size, focal ratios, distance, and lighting conditions.
    • You can instantly find out which star is best for your particular telescope at any particular distance and lighting environment by simply choosing the smallest possible star that still gives you a clear and defocused image.
    • You can even adjust the brightness of the stars by twisting the LED cap.
    • You can mask out any 4 of the 5 stars with a provided magnetic mask.
  • With Hubble 5-star Artificial Stars, telescopes are now easy to test and collimate!



Please make sure the mask is clean, and use it only when needed to prevent the blockage of the pinholes.

The unit should be kept in a clean Ziploc bag when not used, and should be separated from the magnetic mask.

The Hubble Optics 5-star Artificial Stars is powered by 3 AAA batteries (Not Included).

Please note that there are NO printed instructions in the package. To setup, you simply need to insert 3 AAA battery cells, and turn it on.

Here are some very useful online resources on star test and collimation:

1) Telescope Collimation via Star Test by Thierry Legault

2) Aberrator, an extremely useful star test simulator by Cor Berrevoets

3) An Astromart Article by Greg Nowell

4) A Cloudy Nights Review Article by Bill Faatz

5) A Cloudy Nights Review Article by Steve Bennetsen

6) An Astronomy Technology Today Review Article by David Snay

7) An blog by one of our Japanese customers to test the scope in very short distance, post 1-2 [English]

8) An blog by one of our Japanese customers to test the scope in very short distance, post 2-2 [English]

9) The Easy Way to Align Your Telescope's Optics: Indoor Artificial Star Collimation by Derek Wallentinsen

10) Collimation using reticle overlay, USB camera and Hubble artificial star

11) Using Hubble artificial stars and Metaguide to check collimation

A must have book by Harold Richard Suiter: Star Testing Astronomical Telescopes, Second Edition

There is also a brief but excellent chapter on the star test in Richard Berry’s: Build Your Own Telescope

Frequently Asked Questions

Here is the printable form of Frequently Asked Questions


Accurate description, useful item, recommended

-Smooth deal - perfect, as advertised merchandise

Novel solution...

-Item as described (actually, even better), packed well, - thanks!

Super Great Deal


Great product,low price,fast delivery.


Nice Star and great communication - recommended


Great company! Great product!

Achieved the best collimation I have had in a long time...

This is exactly what I have been looking for...

** Best seller of all! ** Thanks for advice about Item handling!! Thanks a lot!!

Thank you very much about your new Star-item. It works very well. I am so happy. Clear skies to you and may your summer days be warm and full of sales!

Works a treat! Great Astro bargain. Highly recommended. Very Fast delivery!!!

Great product. Great price. Very happy with the transaction.

Great company to deal with, nice product!

Great product --- quick delivery AAA +++

This little thing is fabulous value for the few dollars you are charging. I've been contemplating various other types of artificial star gadgets, but, they all seemed so expensive. This little guy is simplicity in itself, and does the job fabulously. Extremely good value at the price you are selling it for.

Super device! Well made! Great price! FAST shipping!

Todo perfecto.+++++++++EXCELENTE+++++++++++++++

Great product... AMAZING CUSTOMER SERVICE!!!! Highly Recommended!

The best $20 astronomical investment I have ever made.

My SCT was collimated better than it's ever been that night, and, I did the collimation in broad daylight.

Wow, it really works, even at 86 ft. I just have to keep direct sunlight off the artificial star so there's enough contrast to see the "airy disc" and you're good to go. I can't wait to see it against the stars tonight, my scope was pretty decently (and quite noticeably) out of collimation. Now I feel it's pretty darn spot on.

I first made sure the focuser was properly aligned.  I then used a barlow laser to make sure both secondary and primary were aligned. Then using the artificial star, I tweaked the primary. I had to move two knobs each about 1/8th of a turn at most. I then locked the mirror with the locking screws, and pointed up at Polaris. It was pretty darn spot on…

I measured the holes of both (units) using a scanning electron microscope at work... The microscope can reliably measure down to less than 10 nanometers (0.01 micrometers). Considering a single 50 micron laser drilled hole in stainless steel disc (unmounted and no LEDs) can run $40-50 from commercial suppliers here in the US, this is a fantastic bargain! Thanks very much.

Your 5-Star Artificial Star is GREAT! I've never had an easier time collimating my SCT. Thanks for a great product.

Great product, good price! I wish I had bought this sooner!!


I am wondering why I didn't get one of these long ago...

My dad is very pleased with his birthday gift. Thanks.


Great Little item! Collimation's a snap with this tool.

Simply put ,you exceeded by far my biggest hopes.

Very, very, very great tool. Should have had it years ago. Excellent a+

It's the best astro tool that I ever bought... In my opinion, it looked much better than a real star.

Every telescope user should have one.


Price (single unit): $27 ($22 + $5 Shipped Worldwide)

Price (two unit pack, shipped worldwide): $49.50 (Shipped Worldwide)

Estimated 6-10 business days delivery