HR 2405
Scientific overview
HR 2405 is a star in the constellation Auriga (Aurigae).
Class C (carbon star). Cool carbon stars — evolved red giants whose atmospheres hold more carbon than oxygen, giving them a striking deep-red, ruby colour. Such stars have surface temperatures around ≤ 3,200 K and appear deep red to the eye.
Physical properties
| Spectral type | C5II |
| Luminosity class | II |
| Apparent magnitude | 5.4 |
| Colour index (B−V) | 2.773 |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
Precision measurements
Astrometry and astrophysics from SIMBAD and Gaia DR3 · Gaia DR3 944939847899350784 · elevated RUWE
| Parallax | 2.0387 ± 0.1661 mas | SIMBAD · measured |
| Distance | 489.3 pc | Gaia · estimated |
| Proper motion (RA) | 0.5 mas/yr | SIMBAD · measured |
| Proper motion (Dec) | -19.758 mas/yr | SIMBAD · measured |
| Radial velocity | 14.089 ± 2.200e-3 km/s | SIMBAD · measured |
| Spectral type | C-N5- | SIMBAD · catalogued |
| Effective temperature | 4105.7 K | Gaia · modeled |
| Radius | 543.9 R_sun | Gaia · modeled |
| Surface gravity (log g) | 0.1477 log(cm/s^2) | Gaia · modeled |
| Metallicity [M/H] | -0.0378 dex | Gaia · modeled |
| Right ascension (ICRS) | 99.1368 deg | SIMBAD · measured |
| Declination (ICRS) | 38.4455 deg | SIMBAD · measured |
Full field-level provenance
- Parallax: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · plx_value · 2020yCat.1350....0G · direct catalogue measurement · retrieved 2026-07-11
- Distance: ESA Gaia astrometric survey · Gaia EDR3 · Bailer-Jones (2021) · external.gaiaedr3_distance · r_med_geo · row 944939847899350784 · Bayesian estimate · retrieved 2026-07-11
- Proper motion (RA): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · pmra · 2020yCat.1350....0G · direct catalogue measurement · retrieved 2026-07-11
- Proper motion (Dec): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · pmdec · 2020yCat.1350....0G · direct catalogue measurement · retrieved 2026-07-11
- Radial velocity: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · rvz_radvel · 2018A&A...616A...7S · direct catalogue measurement · retrieved 2026-07-11
- Spectral type: Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · sp_type · 1996ApJS..105..419B · catalogue identifier/value · retrieved 2026-07-11
- Effective temperature: ESA Gaia astrometric survey · Gaia DR3 · gaiadr3.astrophysical_parameters · teff_gspphot · row 944939847899350784 · model output · retrieved 2026-07-11
- Radius: ESA Gaia astrometric survey · Gaia DR3 · gaiadr3.astrophysical_parameters · radius_gspphot · row 944939847899350784 · model output · retrieved 2026-07-11
- Surface gravity (log g): ESA Gaia astrometric survey · Gaia DR3 · gaiadr3.astrophysical_parameters · logg_gspphot · row 944939847899350784 · model output · retrieved 2026-07-11
- Metallicity [M/H]: ESA Gaia astrometric survey · Gaia DR3 · gaiadr3.astrophysical_parameters · mh_gspphot · row 944939847899350784 · model output · retrieved 2026-07-11
- Right ascension (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · ra · 2020yCat.1350....0G · direct catalogue measurement · retrieved 2026-07-11
- Declination (ICRS): Centre de données astronomiques de Strasbourg (CDS) · SIMBAD · basic · dec · 2020yCat.1350....0G · direct catalogue measurement · retrieved 2026-07-11
measured = direct catalogue value · estimated = Bayesian inference (Bailer-Jones distance) · modeled = model output (Gaia GSP-Phot). Fields a source did not provide are omitted, never invented.
Location in the sky
Knowledge connections
- In constellationAuriga
Related stars in Auriga
Sources
The primary and reference sources this topic draws on.
- HYG DatabaseHYG Database (Hipparcos + Yale Bright Star + Gliese), by D. Nash / astronexus
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
- HipparcosESA Hipparcos space astrometry mission
High-precision parallax, magnitude, and position for ~118,000 stars.