# Astronomy Star Type Calculator — See star classifications

> Calculates star spectral types using surface temperature. (iPhone/iPad app by Ian Annase.)

- Source: https://appshunter.io/ios/app/astronomy-star-type-calculator/id1205157821 (this page in markdown: same URL + `.md`)
- Developer: [Ian Annase](https://appshunter.io/developer/1204138903)
- Category: Education, Utilities
- Price: Free
- Rating: 4.60/5 from 82 App Store ratings
- Age rating: 4+
- Requires: iOS 8.0 · 26 MB
- Languages: American English
- Released: 2017-02-13
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/astronomy-star-type-calculator/id1205157821/reviews.md

## What is Astronomy Star Type Calculator?

This application calculates the precise spectral type of a main sequence star using surface temperature. Use this astronomy app to discover all the different classes of stars from M through O. Some newer star types are included such as Y, K, and L.

Features:
• Enter a surface temperature from 250K to 60,000K.
• As you edit the temperature, the results will change in real time.
• Pictures of example stars from each spectral class.
• Learn about the MK System that defines each star class.
• View the graph that shows the distribution of star classes vs. luminosity

## Key features

- Calculate spectral type from surface temperature
- Real-time result updates
- Example star images per class
- Learn about the MK System
- View star class vs. luminosity graph


## Frequently asked questions about Astronomy Star Type Calculator

### What is the Astronomy Star Type Calculator?

The Astronomy Star Type Calculator is an educational app that determines the spectral type of a main sequence star based on its surface temperature. It allows users to explore different star classes and learn about the MK System.

### What temperature range can I use with the Astronomy Star Type Calculator?

You can enter a surface temperature for a star ranging from 250K to 60,000K. The app will then calculate and display the corresponding spectral type in real time.

### Does the Astronomy Star Type Calculator show examples of stars?

Yes, the app includes pictures of example stars for each spectral class. This helps users visualize the different types of stars they are learning about.

### What is the MK System mentioned in the Astronomy Star Type Calculator?

The MK System, also known as the Morgan-Keenan system, is a classification system used in astronomy to categorize stars based on their spectral characteristics and luminosity. The app helps you understand this system.

### What devices is the Astronomy Star Type Calculator compatible with?

The Astronomy Star Type Calculator is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system.

### How often is the Astronomy Star Type Calculator updated?

The app was last updated on April 19, 2018, to version 6.0. While updates may not be frequent, the core functionality remains stable for its educational purpose.

### What is the age rating for the Astronomy Star Type Calculator?

The Astronomy Star Type Calculator has an age rating of 4+. This indicates it is suitable for young children and general audiences interested in learning about astronomy.

### Does the Astronomy Star Type Calculator have ads?

The provided data does not specify if the Astronomy Star Type Calculator contains advertisements. However, it is listed as free with no in-app purchases, suggesting a straightforward user experience.

## Version history (last 5 releases)

### 6.0 — 2018-04-19

This app has been updated by Apple to display the Apple Watch app icon.

• Manually change the temperature for more precision
• Updated for iOS 11
• Minor bug fixes

### 5.0 — 2017-06-21

- Improved User Experience
- Promotional Text

### 4.1 — 2017-06-09

- Better User Experience

### 4.0 — 2017-06-05

- Google AdMob

### 1.4 — 2017-03-02

- Updated dark tab bar color
- Condensed app name for viewing on device

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## More apps by Ian Annase

- [College GPA Tools](https://appshunter.io/ios/app/college-gpa-tools/id1204138904)
- [Road Trip Gas Cost](https://appshunter.io/ios/app/road-trip-gas-cost/id1205329795)
- [Salary Calculator Pro](https://appshunter.io/ios/app/salary-calculator-pro/id1205384061)
- [Astronomy Tools HD](https://appshunter.io/ios/app/astronomy-tools-hd/id1207963750)

All apps by Ian Annase: https://appshunter.io/developer/1204138903

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*