StoneBusters vs Horizon

On the mobile screen, users can access data from the Minor Planet Center, such as the NEO Confirmation Page (NEOCP) and the Possible Comet Confirmation Page (PCCP). A list of recently observed NEOs, organized by classification: unnumbered single-opposition, multiple-opposition, and numbered objects. Object from NEOfixer (University of Arizona) may be visualized, filtered and sorted. A personalized “starred” list let the user to have a list of preferred objects available for quick view and a custom list of selected objects, based on various physical and observational parameters may also be listed. Additionally, a list of objects that were removed from the NEOCP is available, with each object graphically categorized by its final classification (e.g., NEO, comet, artificial object, missing object, etc.). Once an object is selected, the app provides detailed information, including: an observation summary (observatory codes and details), Ephemeris calculation, Orbital elements and uncertainty orbit graphic representation for NEO. Users can also "identify" an object displaying physical and orbital data retrieved from NASA JPL's Solar System Dynamics (SSD) database. This includes secondary designations, discovery circumstances, and citation text (if available). There is also the possibility to “WAMO” an object with personal MPC observatory code to obtain the status of observation, and also have Summary WAMO data visualized as bar histograms and tables. As a curiosity—and to assist users without an observatory code—if location permissions are enabled, the app can list the 30 nearest observatory codes based on distance from the user's device. (For security reasons, the exact coordinates or map positions of the observatories are not displayed, and never will be.) The app relies on APIs provided by: - The International Astronomical Union's Minor Planet Center - NASA Jet Propulsion Laboratory's SSD and CNEOS (Center for Near-Earth Object Studies) - NEOfixer (University of Arizona) Some calculations, such as topocentric ephemerides, are performed directly on the device. While the app provides convenient, on-the-fly previews of information, users are strongly encouraged to refer to the official sources mentioned above for authoritative and professionally calculated data.

Hold up your phone and watch the night sky come alive. Horizon-AR uses your camera, GPS, and device motion to place real-time augmented reality overlays exactly where celestial objects appear in the sky above you. TRACK THE SOLAR SYSTEM Follow the Moon, Sun, Mercury, Venus, Mars, Jupiter, and Saturn with a live arc overlay showing each object's full path across the sky tonight. Rise and set times update in real time based on your precise location. 110 MESSIER DEEP-SKY OBJECTS IN AR Activate Hot Targets mode and see every Messier object currently above your horizon floating in the AR view — galaxies, nebulae, open clusters, and globular clusters, each colour-coded by type. Tap any label to open a detail card showing: • Object type and Messier catalogue number • Common name (Andromeda Galaxy, Orion Nebula, Pleiades…) • Current altitude above the horizon • Apparent visual magnitude • Recommended instrument — naked eye, binoculars, or telescope • Favourite toggle, saved across sessions When objects cluster together, a single tap fans them out radially so you can reach each one individually. FILTER BY OBJECT TYPE Narrow the Hot Targets overlay to just galaxies, just nebulae, or just star clusters with a single tap. Objects you've starred appear in your Nightly Overview for quick access every session. FREEZE THE SKY Long-press anywhere to lock the entire AR view — overlays and camera image — as a still frame. Perfect for star parties, sketching, or sharing a screenshot. Tap once to unfreeze. NIGHTLY OVERVIEW Open the Tonight sheet for a full list of rise, transit, and set times for all solar system objects plus your Messier favourites, sorted for the coming night at your location. WORKS WITHOUT FULL PERMISSIONS No camera access? Horizon-AR switches to a star-field background with altitude rings and an azimuth grid so you can still explore the sky. Declined location? Enter coordinates manually and continue without interruption. No account. No subscription. No ads. Privacy: your location and camera data never leave your device.