# Asteroid Close Approach — Upcoming close approaches > Track upcoming asteroid close approaches and potential impacts using NASA data. (iPhone/iPad app by Arpacore B.V..) - Source: https://appshunter.io/ios/app/asteroid-close-approach/id1562569488 (this page in markdown: same URL + `.md`) - Developer: [Arpacore B.V.](https://appshunter.io/developer/1441928570) - Category: Education, Reference - Price: $1.99 - Age rating: 4+ - Requires: iOS 14.0 · 34 MB - Languages: American English - Released: 2021-05-04 - Data updated: 2026-08-23 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/asteroid-close-approach/id1562569488/reviews.md ## What is Asteroid Close Approach? Stay informed about the most recent near-Earth asteroid encounters—right from your iPhone or on your Apple Watch. Easily check the upcoming dates and times of close approaches, along with their distances, velocities, magnitudes, and estimated impact energies in kilotons. Dive into NASA’s Sentry database, a powerful collision monitoring system that continuously scans the latest asteroid catalog for any potential impacts within the next 100 years. Curious about an asteroid’s mass and energy? Use the built-in calculator to estimate these figures based on its absolute magnitude and approach speed. Features: • Latest Encounters on Your Wrist: View real-time asteroid data at a glance on your Apple Watch. • Comprehensive Tracking: Check each asteroid’s approach date, distance, velocity, magnitude, and potential impact energy. • Sentry Database Access: Keep tabs on NASA’s up-to-date collision predictions for the next century. • Asteroid Mass & Energy Calculator: Estimate physical properties and potential impact energy with a simple input of magnitude and speed. Stay informed, prepared, and captivated by the wonders of our cosmic neighborhood—anytime, anywhere. ## Key features - Real-time asteroid data on Apple Watch - Comprehensive approach details - Access to NASA's Sentry database - Asteroid mass and energy calculator - Collision monitoring for the next century ## Chart rankings - #179 in Top Paid · Education (US App Store) ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/asteroid-close-approach/id1562569488/reviews.md ### 2/5 — Asteroid Close Approach *2021-07-09* I purchased this app in good faith, but it has menu items that don’t work, and it has limited functionality. Either refund my money or correct the issues to make this app work the money you got from me. Your rating will be one star if problems aren’t corrected!!!!! I can’t even access your web site…..What’s the DEAL! **Developer response:** Thank you for downloading the app, but we are sorry to hear that you are not satisfied. Please use the bug reporting form in the app section of our website or send us an email and let us know which menu items do not work. The website could have been offline for a few hours due to DNS propagation. We are sorry for the inconvenience. (PS) Please be sure to have installed the latest version of the app. ## Frequently asked questions about Asteroid Close Approach ### What information does Asteroid Close Approach provide about asteroids? Asteroid Close Approach provides details on upcoming asteroid close approaches, including their dates, distances, velocities, magnitudes, and estimated impact energies in kilotons. It also allows you to access NASA's Sentry database for collision predictions. ### Can I use Asteroid Close Approach on my Apple Watch? Yes, Asteroid Close Approach offers real-time asteroid data directly on your Apple Watch, allowing you to view important information at a glance. ### How does the Asteroid Mass & Energy Calculator work? The built-in calculator estimates an asteroid's mass and potential impact energy. You can input its absolute magnitude and approach speed to get these figures. ### What is the Sentry database mentioned in Asteroid Close Approach? The Sentry database is NASA's collision monitoring system, which the app accesses to provide up-to-date predictions for potential asteroid impacts within the next 100 years. ### What devices does Asteroid Close Approach support? Asteroid Close Approach is supported on iPhone, iPod, and Apple Watch devices. ### How much does Asteroid Close Approach cost? Asteroid Close Approach is a paid application, available for $1.99. ### How often is Asteroid Close Approach updated? The app was last updated on January 31, 2025, with version 1.7.2. This indicates a commitment to regular updates and maintenance. ### Is Asteroid Close Approach suitable for children? Asteroid Close Approach has an age rating of 4+, making it appropriate for younger users interested in learning about space and asteroids. ## Version history (last 5 releases) ### 1.8 — 2026-08-01 NEW: Close approach alerts Get a notification whenever an asteroid passes near a planet you care about. Tap the bell on the Close approaches screen to create an alert, then choose: • The body to watch — Mercury, Venus, Earth, the Moon, Mars, Jupiter, Saturn, Uranus, Neptune or Pluto • How close is close enough — set your own threshold in lunar distances, kilometres or astronomical units • When to be told — from a week ahead right down to the moment of approach Create as many alerts as you like, pause any of them at any time, and see at a glance which approaches are coming up for each one. Alert data comes straight from NASA/JPL and is kept up to date in the background. ### 1.7.2 — 2025-01-31 - Fixed the volume conversion in the calculator. ### 1.7.1 — 2025-01-29 We've made some improvements to enhance your experience: - Fixed a bug in the calculator related to the order of magnitude for mass calculations. - Fixed a bug in the conversion in TNT previously indicated in kt instead of TNT - Added a visualization for the predicted volume of objects, making data more intuitive. - Refactored the calculator Ul with a cleaner design and new icons for a better user experience. ### 1.7 — 2025-01-29 We’ve made some improvements to enhance your experience: • Fixed a bug in the calculator related to the order of magnitude for mass calculations. • Added a visualization for the predicted volume of objects, making data more intuitive. • Refactored the calculator UI with a cleaner design and new icons for a better user experience. Update now and enjoy the improvements! ### 1.6 — 2025-01-24 What’s New: • Revised Calculation Engine: Improved the accuracy of mass and energy estimates based on absolute magnitude and velocity. • Bug Fixes & Stability: Squashed a few pesky bugs to ensure a smoother user experience on both iPhone and Apple Watch. • Enhanced Performance: Overall optimizations for faster loading times and more reliable data syncing. Enjoy exploring near-Earth asteroids with greater precision and confidence! ## Apps similar to Asteroid Close Approach | App | Rating | Price | Category | | --- | --- | --- | --- | | [NEOScope](https://appshunter.io/ios/app/neoscope/id6477293859) | 5.0 (1) | $0.99 | Education | | [Hubble: Deep Space PRO](https://appshunter.io/ios/app/hubble-deep-space-pro/id1579382668) | — | $0.99 | Education | | [Ancient Egyptians History Quiz](https://appshunter.io/ios/app/ancient-egyptians-history-quiz/id1352346028) | — | $1.99 | Education | | [Calvary Chapel West Houston](https://appshunter.io/ios/app/calvary-chapel-west-houston/id1505930432) | 5.0 (6) | Free | Education | ## More apps by Arpacore B.V. - [CTC-AE+](https://appshunter.io/ios/app/ctc-ae-plus/id349258523) - [Tram Padova](https://appshunter.io/ios/app/tram-padova/id358191962) - [ESAMed](https://appshunter.io/ios/app/esamed/id1441929667) - [MedTest](https://appshunter.io/ios/app/medtest/id1466594613) - [Dilution +](https://appshunter.io/ios/app/dilution-plus/id1548509209) All apps by Arpacore B.V.: https://appshunter.io/developer/1441928570 --- *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 2026-08-23.*