About
Mobile Observatory transforms any Android device into a full-featured personal observatory. Point your phone at the sky to instantly identify stars, planets, constellations, and satellites using live augmented reality. A standout feature is its topographic horizon engine, which computes real terrain profiles from NASA elevation data — delivering rise and set times that account for hills and mountains at your exact location, a capability no other astronomy app currently matches. The app includes a 2.5M+ star catalog (Hipparcos, SAO, and extended datasets), a deep-sky catalog of 2,500+ nebulae, galaxies, and star clusters with photos, and an interactive 3D solar system orrery complete with realistic comet tails and eclipse shadows. An event calendar covering 50+ types — eclipses, conjunctions, occultations, transits, meteor showers, and more — pairs with smart push notifications for aurora alerts, solar flares, and ISS passes. Satellite tracking monitors 10,000+ objects including the ISS and Starlink trains. Live space weather delivers aurora forecasts, Kp-index readings, solar flare alerts, and NASA SDO solar imagery. The Observing Planner auto-generates optimized session plans based on your equipment and location, and a beta Telescope Control feature lets you slew a GoTo telescope to any object via the INDI protocol. With 200,000+ installs, a 4.7-star rating from 4,800+ reviews, and 14+ years of active development, Mobile Observatory suits casual stargazers, serious amateur astronomers, astrophotographers, and students alike. The free tier is genuinely capable; Pro unlocks the full feature set via subscription or a one-time purchase.
Key Features
- AR Sky View: Point your phone at the sky to identify stars, planets, constellations, and satellites in real time using augmented reality overlays.
- Topographic Horizon: Computes real terrain profiles from NASA elevation data for pinpoint-accurate rise and set times at your exact location — unique to Mobile Observatory.
- Satellite & Space Weather Tracking: Monitor 10,000+ satellites including the ISS and Starlink trains, plus live aurora forecasts, Kp-index, solar flare alerts, and NASA SDO imagery.
- Deep Sky & Event Catalog: 2,500+ deep-sky objects with photos and a 50+ event type calendar covering eclipses, conjunctions, occultations, meteor showers, and more.
- Observing Planner & Telescope Control: Auto-generates optimized observing sessions for your equipment and location, and controls GoTo telescopes via the INDI protocol (beta).
Use Cases
- Casual stargazers using AR to instantly identify stars, planets, and constellations by pointing their Android phone at the sky.
- Amateur astronomers generating auto-optimized observing session plans based on their telescope equipment and precise location.
- Astrophotographers calculating accurate Milky Way, planet, or comet rise times over their real terrain horizon for shoot planning.
- Satellite enthusiasts monitoring ISS passes, Starlink trains, and receiving aurora or solar flare alerts via smart push notifications.
- Students and educators exploring the interactive 3D solar system orrery and detailed star/planet data for astronomy lessons.
Pros
- Comprehensive All-in-One App: Combines AR sky view, satellite tracking, deep-sky catalog, space weather, 3D solar system, and telescope control in a single download.
- Unique Topographic Horizon Engine: Real NASA terrain profiles mean accurate rise/set times that account for mountains and hills — no other astronomy app offers this.
- Flexible Pricing Options: The free tier is genuinely useful; Pro is available as a subscription or a lifetime one-time purchase to suit different budgets.
- Proven Track Record: 14+ years of active development, 4.7-star rating from 4,800+ reviews, and 200,000+ installs across all versions.
Cons
- Android Only: Mobile Observatory is exclusively available on Android; there is no iOS or desktop version for users outside the Google ecosystem.
- Telescope Control Still in Beta: The GoTo telescope integration via INDI protocol is experimental and may not support all telescope models reliably.
- Full Feature Set Requires Pro Upgrade: Advanced features such as the complete deep-sky catalog, observing planner, and telescope control are locked behind the premium tier.
Frequently Asked Questions
Is Mobile Observatory free to use?
Yes, Mobile Observatory is free to download on Google Play with a capable free tier. Premium features can be unlocked via a subscription or a one-time in-app purchase. Mobile Observatory Pro, which bundles lifetime premium access, is also sold as a separate app on Google Play.
What makes the topographic horizon feature unique?
Mobile Observatory uses NASA elevation data to calculate the real terrain profile around your GPS location, producing rise and set times that account for hills, mountains, and other obstructions. This level of local accuracy is not available in any other astronomy app.
Can I track satellites with Mobile Observatory?
Yes. The app tracks the ISS, Starlink trains, and over 10,000 satellites in real time, displaying their live positions in the AR sky view and sending push notifications ahead of notable passes.
Does Mobile Observatory support telescope control?
Yes, in beta. The app connects to GoTo telescopes via the INDI protocol and can slew the telescope to any selected object with a single tap directly from the sky map or catalog.
How many stars and deep-sky objects are in the catalog?
Mobile Observatory includes over 2.5 million stars from the Hipparcos, SAO, and extended catalogs, as well as 2,500+ deep-sky objects (nebulae, galaxies, and star clusters) complete with photos and detailed data.
