The AsterNym star registry
Deneb Algedi
Deneb Algedi: the white star of Capricornus
white · Capricornus · δ Cap
Deneb Algedi is a white star, burning hotter than our own Sun in the constellation Capricornus, one of the stars with a proper name recognised in the IAU Catalog of Star Names. At magnitude 2.85 it is visible to the naked eye under a dark sky.
Most stars in the sky are anonymous points of light. Deneb Algedi 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
Deneb Algedi at a glance
- Constellation
- Capricornus
- Other name
- δ Cap
- Catalogue number
- HIP 107556
- Distance
- ≈ 39 light-years
- Brightness
- Magnitude 2.85 naked-eye
- Star type
- A7 III
- Colour
- white
- Best seen from
- Almost everywhere on Earth
- Right ascension
- 21h 47m 04s
- Declination
- −16° 07′ 38″
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 Deneb Algedi?
Deneb Algedi is a white giant. Its surface runs around 7,500 to 10,000°C, hot enough to look white or blue-white to the eye. 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.
Its colour is not the whole story. A white star still in the steady part of its life would burn for about a thousand million years. This one is past that stage, and it is cool at the surface because it has swollen outward, not because it was born this way.
It is a giant, which is what a star becomes when it exhausts the hydrogen in its core. It has swollen outward and cooled at the surface, and it is now brighter than it ever was as a young star. The Sun will do this too, in about five thousand million years.
The light you are looking at is old
The light you can see from Deneb Algedi left in 1987, which puts it roughly a lifetime ago. Nobody has invented anything since then that the light knows about; it has simply been travelling.
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 does the name Deneb Algedi mean?
The system bore the traditional names Deneb Algedi, derived from the Arabic ذنب الجدي (ðanab al-jady), meaning "the tail of the goat", referring to the fishlike tail of the celestial sea-goat Capricorn, and Scheddi.
In Chinese astronomy, Delta Capricorni is known as 壘壁陣四 (Lěi Bì Zhèn sì), meaning 'The Fourth Star of the Line of Ramparts'.
Name origin from English Wikipedia. AsterNym does not invent an etymology where none is recorded, and most stars in this catalogue have none: they carry modern names, or a catalogue designation and nothing older.
What could a Deneb Algedi dedication represent?
Deneb Algedi 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 Capricornus in the sky.”
Where can you see Deneb Algedi?
It sits 16° south of the celestial equator, so it clears the horizon everywhere short of latitude 74°N, in practice, every inhabited latitude on Earth. It passes directly overhead at latitude 16°S. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 2.85 it is an easy naked-eye star from any reasonably dark spot.
Deneb Algedi belongs to Capricornus, where it is the brightest star.
What does Deneb Algedi mean in astrology?
The classical fixed-star tradition: Ptolemy, the medieval Behenian lists, Robson’s 1923 compilation. Is silent on Deneb Algedi, 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, Deneb Algedi stands at 23° Aquarius at the J2000 epoch, and the Sun passes that degree around 11 February 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 Deneb Algedi 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 Deneb Algedi →Real star · your message · a page to share
Your Deneb Algedi dedication includes
- Your chosen dedication name
- Your personal message
- Deneb Algedi's real astronomical coordinates
- A shareable dedication page
- Its location on the AsterNym Galaxy Map
- An optional printable certificate and gift presentation
Deneb Algedi keeps its established astronomical name. Your dedication is a personal commemorative record within the AsterNym registry.
Frequently asked questions about Deneb Algedi
- What does Deneb Algedi mean in astrology?
- The classical fixed-star tradition has no documented meaning for Deneb Algedi. Projected onto the zodiac, Deneb Algedi stands at 23° Aquarius, and the Sun passes that degree each year around 11 February.
- Is Deneb Algedi the brightest star?
- Deneb Algedi shines at magnitude 2.85 · visible to the naked eye on a clear night, one of the few thousand stars with an officially recognised name.
- How far away is Deneb Algedi?
- Deneb Algedi is approximately 39 light-years from Earth. The light reaching us tonight began its journey around 39 years ago.
- Which constellation contains Deneb Algedi?
- Deneb Algedi is the brightest star in Capricornus.
- Can everyone see Deneb Algedi?
- It sits 16° south of the celestial equator, so it clears the horizon everywhere short of latitude 74°N, in practice, every inhabited latitude on Earth. It passes directly overhead at latitude 16°S. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 2.85 it is an easy naked-eye star from any reasonably dark spot.
- Is dedicating Deneb Algedi an official astronomical renaming?
- No. Deneb Algedi 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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