The AsterNym star registry
Delta Crucis
Delta Crucis: the blue star of Crux
blue · Crux · δ Cru
Delta Crucis is a blue star in the constellation Crux, one of the stars with a proper name recognised in the IAU Catalog of Star Names. At magnitude 2.79 it is visible to the naked eye under a dark sky.
Most stars in the sky are anonymous points of light. Delta Crucis is not. Some IAU-recognised names are ancient; others were adopted by the IAU only recently. Either way, the star already has a scientific identity, and a dedication attaches a human story to it.
Real star · Personal dedication · Recorded in the AsterNym registry
See what a dedicated page looks like: preview
Delta Crucis at a glance
- Constellation
- Crux
- Other name
- δ Cru
- Catalogue number
- HIP 59747
- Distance
- ≈ 345 light-years
- Brightness
- Magnitude 2.79 naked-eye
- Star type
- B2 IV
- Colour
- blue
- Best seen from
- The Southern Hemisphere and lower northern latitudes
- Right ascension
- 12h 15m 10s
- Declination
- −58° 44′ 56″
J2000 catalogue coordinates that can be independently cross-checked against astronomical databases. A planetarium app showing coordinates of date will differ slightly, because proper motion and precession move a star’s apparent position over time.
What kind of star is Delta Crucis?
Delta Crucis is a blue-white subgiant. Its surface runs somewhere between 10,000 and 30,000°C, which is what gives it a blue-white cast. Colour in a star is a temperature reading rather than a decoration: the hot ones are blue and the cool ones red, the opposite way round to a kitchen tap.
It is spending its fuel at a rate the Sun never will. Most of the bright stars in familiar constellations are this kind, which is why the night sky looks younger and hotter than the average star actually is.
A star of this class gets tens of millions of years, against the Sun's ten thousand million.
It is a subgiant, caught in the short crossing between an ordinary life and a giant one. Its core has run out of hydrogen but its outer layers have not finished expanding, and astronomically this stage passes quickly.
The light you are looking at is old
The light arriving from Delta Crucis tonight left in about 1681, some 345 years ago. Everything that has happened since, every person you have heard of from the last few centuries, happened while it was in transit.
That delay is the part people find hardest and like most. A star is the one thing you can give someone that was already old before either of you was born and will outlast anything else you could have chosen.
It is comfortably visible without equipment on a decent night.
What could a Delta Crucis dedication represent?
Delta Crucis is especially meaningful for someone who:
- · Deserves something older than any gift shop
- · Marks a beginning, an anniversary or a promise
- · Is remembered every time you look up
- · Has a light you want recorded somewhere permanent
Dedication idea
“For the one I think of when I find Crux in the sky.”
Where can you see Delta Crucis?
It is easy to see from much of the Southern Hemisphere. It can also appear from lower northern latitudes, but it never rises for observers north of about latitude 31°N. It passes directly overhead at latitude 59°S. It stands highest at midnight in March, so March and April evenings are the best time to look. At magnitude 2.79 it is an easy naked-eye star from any reasonably dark spot.
Delta Crucis belongs to Crux.
What does Delta Crucis mean in astrology?
The classical fixed-star tradition: Ptolemy, the medieval Behenian lists, Robson’s 1923 compilation. Is silent on Delta Crucis, and we don’t invent lore where none exists. What astrology can still read is the star’s real position, below.
Projected onto the zodiac the way fixed-star astrology reads any star, Delta Crucis stands at 5° Scorpio at the J2000 epoch, and the Sun passes that degree around 25 October in the years around 2000. Fixed-star longitude shifts slowly against the tropical zodiac because of precession, about one degree every seventy-two years, so a natal conjunction must be calculated for the birth year rather than read off this J2000 value or a calendar date.
Traditional interpretations, not facts or predictions. The position and dates are computed.
Dedicate Delta Crucis to someone who matters
A flower fades. A card is eventually put away. A star gives your message a place in the sky.
from$29.95a year
Dedicate Delta Crucis →Real star · your message · a page to share
Your Delta Crucis dedication includes
- Your chosen dedication name
- Your personal message
- Delta Crucis's real astronomical coordinates
- A shareable dedication page
- Its location on the AsterNym Galaxy Map
- An optional printable certificate and gift presentation
Delta Crucis keeps its established astronomical name. Your dedication is a personal commemorative record within the AsterNym registry.
Frequently asked questions about Delta Crucis
- What does Delta Crucis mean in astrology?
- The classical fixed-star tradition has no documented meaning for Delta Crucis. Projected onto the zodiac, Delta Crucis stands at 5° Scorpio, and the Sun passes that degree each year around 25 October.
- Is Delta Crucis the brightest star?
- Delta Crucis shines at magnitude 2.79 · visible to the naked eye on a clear night, one of the few thousand stars with an officially recognised name.
- How far away is Delta Crucis?
- Delta Crucis is approximately 345 light-years from Earth. The light reaching us tonight began its journey around 345 years ago.
- Which constellation contains Delta Crucis?
- Delta Crucis is part of Crux.
- Can everyone see Delta Crucis?
- It is easy to see from much of the Southern Hemisphere. It can also appear from lower northern latitudes, but it never rises for observers north of about latitude 31°N. It passes directly overhead at latitude 59°S. It stands highest at midnight in March, so March and April evenings are the best time to look. At magnitude 2.79 it is an easy naked-eye star from any reasonably dark spot.
- Is dedicating Delta Crucis an official astronomical renaming?
- No. Delta Crucis keeps its internationally recognised astronomical name. An AsterNym dedication records your personal name and message in the AsterNym registry without changing the star's scientific identity.
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