Epsilon Eridani is about 10.5 light-years away. Its catalogue identity is HIP 16537, and its visual magnitude is about 3.7. It is a K-type star: cooler than the Sun, rather than a duplicate of it. The short distance makes it a useful place to investigate how planetary systems develop. In a dark sky you can see the star without an instrument; its planets and debris require very different observations. Sources: SIMBAD, https://simbad.cds.unistra.fr/simbad/sim-id?Ident=eps+Eri; NASA SOFIA account, https://science.nasa.gov/universe/exoplanets/sofia-confirms-nearby-planetary-system-is-similar-to-our-own/.
In 1960 Frank Drake pointed Green Bank's 85-foot Tatel radio telescope toward Epsilon Eridani and Tau Ceti for Project Ozma. The receiver searched near the 21-centimetre hydrogen line. Drake's own recollection describes the excitement when a pulsed signal appeared toward Epsilon Eridani. The observatory's history explains that the signal was terrestrial, associated with an airplane; the experiment found no evidence of another civilization. The lasting achievement was an experiment that turned a question into a measurable search. Sources: Green Bank Observatory, https://greenbankobservatory.org/about/telescopes/85-1-howard-tatel/; Frank Drake's reminiscence, https://www.gb.nrao.edu/fgdocs/tatel/ozma.htm.
Today the system has a known gas giant, Epsilon Eridani b. NASA's catalogue gives an orbital period of roughly 7.3 years and a distance of about 3.5 astronomical units from the star. Radial-velocity measurements detect the star's motion; they do not show a planet through an amateur eyepiece. The comparison with Jupiter concerns a giant planet and its orbit, not an established second Earth. Source: NASA exoplanet catalogue, https://science.nasa.gov/exoplanet-catalog/epsilon-eridani-b/.
Infrared observations reveal warm debris. A 2017 SOFIA study favoured material concentrated in at least one narrow belt over a broadly filled inner disk. That material traces collisions and the arrangement of smaller bodies. A later JWST/NIRCam study reported no statistically significant planetary point-source detection in its observations, while setting tighter limits on possible companions. Absence from those images does not cancel evidence from the star's motion. Sources: NASA SOFIA account, above; Llop-Sayson and colleagues, https://arxiv.org/abs/2508.08463.
To find the star, establish Orion and the winding Eridanus figure west of Rigel, then follow the labelled River stars to Epsilon on the finder. Its reference position is approximately 3h 33m, −9° 27′. At 45° N, the geometric upper culmination is about 36° above the southern horizon, calculated from declination. Begin with a wide field, confirm the surrounding pattern, then compare its warm colour with nearby stars. Neither the planet nor the dust belts are ordinary visual targets. Check the week's darkness and Moon interference separately. Identity and geometry: stored Hipparcos coordinates and accepted Star Almanack figure paths; https://simbad.cds.unistra.fr/simbad/sim-id?Ident=eps+Eri.
The historical setting matters. Project Ozma was not a search for an easily photographed spacecraft or a claim that a particular star had inhabitants. It tested whether a narrowband radio signal might stand out from natural background emission at a frequency chosen for physical reasons. A hydrogen-line search could be repeated and scrutinized, even when the result was null. Epsilon Eridani's proximity made it an intelligible early target, but proximity alone does not establish biology. The contrast between a disciplined radio experiment and the far more detailed planetary measurements available today gives the star its enduring place in the history of observation.
For a visual log, distinguish what the eye establishes from what instruments infer. Record whether Epsilon Eridani is visible directly, how readily it separates from neighbouring field stars, and the observing conditions. Its brightness and position are direct observing matters; a debris belt, a planet inferred from stellar motion, and a possible radio transmitter are separate scientific questions. Keeping those levels of evidence distinct is part of the story of this nearby star.
