HATPI

A new lens on the universe

High-precision imaging of the full night sky

The HATPI Project

In a single 45 second exposure, the HATPI instrument observes the full night sky, in all directions, from the zenith down to an elevation angle of 35 degrees, at a spatial resolution of 20 arcseconds per pixel. The key science aim of HATPI is to explore the variable sky, including studying astrophysical transient events (cosmic explosions), transiting exoplanets, variable stars, and moving objects (near‑Earth asteroids). HATPI is located at Las Campanas Observatory in the Chilean Andes
-29.010486, -70.701080

Full Technical Details

HATPI Data Portal

Access light curves, calibrated image stamps, and real-time alerts from our all-sky survey.

Image Stamps (coming soon)

Calibrated and subtracted image-stamps with original spatial resolution

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Light Curves

Raw and pre-processed, trend-filtered light curves at 30 or 45-second time resolution

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Frames

Identify when and where HATPI has observed your target of interest

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Alerts (coming soon)

Transient alert system

Visit Data Portal

Publications

astro-ph.EP astro-ph.GA
Feb 25, 2026

HATPI Pre-Perihelion Time-series Photometry of the Interstellar Comet 3I/ATLAS

Joel D. Hartman, Gáspár Á. Bakos, Andrés Jordán, Sarah Thiele, Zoltán Csubry, et al.

HATPI is a recently commissioned time-domain facility at Las Campanas Observatory, Chile. In this paper, we present moving object time-series photometry with this facility, focusing on the interstellar comet 3I/ATLAS, first robustly recovered by HATPI on 2025 July 2.

astro-ph.EP
Feb 13, 2026

TIC65910228b: A single-transit discovery of a massive long-period warm Jupiter with TESS

Felipe I. Rojas, Rafael Brahm, Matías I. Jones, Márcio Catelan, Jozef Liptak, et al.

We report the discovery and characterization of TIC65910228b, a transiting warm Jupiter with a mass of 4.554 M_J and a radius of 1.088 R_J, orbiting an evolved F-type star every ~180.52 days in an eccentric orbit, confirmed with photometric follow-up from HATPI.

astro-ph.EP astro-ph.SR
Oct 22, 2025

A Compact Multi-Planet System of Three Transiting Giant Planets Around TIC118798035

Rafael Brahm, Trifon Trifonov, Andrés Jordán, Thomas Henning, Néstor Espinoza, et al.

We report the discovery and characterization of three transiting giant planets in the TIC118798035 system, identified from TESS data and confirmed with ground-based photometric transit observations along with radial velocity variations.

The HATPI Team

Extended Team

Ferenc Rózsa

Technical Maintenance
Fornax Hungary

Antoine Thibault

Université de Genève

István Domsa

Software Engineer

Sándor Pigai

Software Engineer

Builders

Pál Sári

Mechanical Engineering
Fornax Hungary

Zsombor Sári

Mechanical Engineering
Fornax Hungary

Ilona Mitró

Assembly
Fornax Hungary

Tamás Butuza

Telescope Drive Electronics

György Medgyesi

Engineering Design

Zoltán Tobler

Autoguiding Solutions

Sándor Kóra

Thermometer

Vincent Suc

Dome Electronics Design
Universidad Adolfo Ibáñez

Past Contributors

Amir Siraj

Graduate Student
Asteroids

Eduardo Latorre

Technical Assistance
Obstech Chile

Marcelo Tala

Technical Assistance

Rodrigo Rojas

Technical Assistance

Waqas Bhatti

Postdoctoral Fellow
Princeton University

Acknowledgments

Generous funding provided by the Moore, Packard, and Mt. Cuba Astronomical foundations. Internal funding provided by Princeton University. HATPI is hosted by Las Campanas Observatory of the Carnegie Institution for Science.