Alterf
HR 3773 · HIP 46750 · λ Leo
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 4.31 mag
- Parallax
- 9.91 mas → about 329.1 light-years away
- Spectral type
- K5IIIvar
- Right ascension
- 142.9301°
- Declination
- 22.968°
- Designation
- HR 3773
- Bayer designation
- λ Leo
- HIP number
- 46750
- IAU name adopted
- 2017-02-01
- Name language
- Arabic
- Name origin (IAU)
- Applied in recent times from the pre-Islamic Arabian lunar mansion name al-tarf, "the Glance," for κ Cnc and λ Leo, associated with the pre-Islamic Arabian asterism al-asad, as if being located on that lion's eyes.
Source:IAU Working Group on Star Names · checked 2026-11-02 ↗ESA Hipparcos Catalogue (ESA Gaia Archive) · checked 2026-11-03 ↗
Related
Constellation
In everyday life
- Light from this object takes about 329 years to reach Earth — the light you see tonight left around AD 1697 (official distance ÷ speed of light).
- At magnitude 4.3 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 23° — it rises above the horizon in Seoul (37.6° N), so it is visible from Korea in the right season.
Worked out from this object's official values.