L1551 IRS 5
Star in the constellation Taurus
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L1551 IRS 5 is a protostellar envelope surrounding a binary protostar system in the constellation of Taurus 450 light-years from Earth. The binary system itself is known as L1551 NE,[4] and each star is surrounded by protoplanetary disk.[disputed (for: These are actually two different systems, both binary systems.) – discuss][5] The system is one of Jim Kaler's The 100 greatest stars.[6]
HH 154 in mid-infrared around L1551 IRS 5 (bright red star in the middle) and L1551 NE (less bright red star to the left) Credit: NASA Spitzer Space Telescope | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 31m 34.077s[1] |
| Declination | +18° 08′ 04.90″[1] |
| Characteristics | |
| Spectral type | K3V/M3III[2] |
| Astrometry | |
| Distance | 450 ly (140[3] pc) |
| Details | |
| A | |
| Mass | 0.68[3] M☉ |
| Radius | 4[3] R☉ |
| Luminosity | 4.2[3] L☉ |
| B | |
| Mass | 0.13[3] M☉ |
| Other designations | |
| L551 IRS 5, 2MASS J04313407+1808049, IRAS 04287+1801, WISE J043134.12+180804.9 EPIC 210683818 | |
| Database references | |
| SIMBAD | data |
The binary is surrounded by a complex, gas-rich protoplanetary disk system.[5]
Protoplanetary disk
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| North protoplanetary disk | 13.3±3.5 AU | 35±14° | — | |||
| South protoplanetary disk | 14.0±5.0 AU | 45±15° | — | |||
| Circumbinary protoplanetary disk | 141.9±7.4 AU | 61.5±1.7° | — | |||
