Sky position and distance
HL Tau is placed at J2000 RA 4.5 h, Dec 18.2° at 480 light-years.
SourceALMA
EpochJ2000
Space Time
Star system · evidence and sources
HL Tau
A young star whose ALMA observation resolves nested bright rings and dark gaps across its planet-forming disk.
Also known as HL Tauri.
Catalog
Position basis, the same label the app shows on the selection card.
Every aspect, with its origin
One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.
ObservedCatalogComputedReconstructedIllustrativeUndocumented
Measured disk orientation
The reconstructed disk uses the published inclination of 46.72° and position angle of 138.02°.
SourceALMA Partnership et al. 2015 · record 2015ApJ...808L...3A
UncertaintyInclination ±0.05°; position angle ±0.07°.
ALMA millimetre observation
The reprocessed ALMA continuum image of HL Tau is available under Evidence & sources.
SourceALMA Observatory
MethodInterferometric millimetre continuum imaging
Disk rendering
The close-up wraps the ALMA image (0.87, 1.3 and 2.9 mm continuum) on a disk tilted to the published inclination and position angle, with 42,000 particles sampled from its ring profile.
LimitVertical structure and the far side of the disk are not resolved by the image; scale height is a display choice.
Description and facts
The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.
SourceSpace Time editorial text
What is not measured
- Appearance: a reconstruction from measurements, not a direct observation. Disk rendering. Vertical structure and the far side of the disk are not resolved by the image; scale height is a display choice.
Not yet documented
- Description: The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.