The AsterNym star registry
Alderamin
Alderamin: the white star of Cepheus
white · Cepheus · α Cep
Alderamin is a white star, burning hotter than our own Sun in the constellation Cepheus, one of the stars with a proper name recognised in the IAU Catalog of Star Names. At magnitude 2.51 it is visible to the naked eye under a dark sky.
Most stars in the sky are anonymous points of light. Alderamin 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
Alderamin at a glance
- Constellation
- Cepheus
- Other name
- α Cep
- Catalogue number
- HIP 105199
- Distance
- ≈ 49 light-years
- Brightness
- Magnitude 2.51 naked-eye
- Star type
- A7 IV-V
- Colour
- white
- Best seen from
- The far northern sky
- Right ascension
- 21h 18m 35s
- Declination
- +62° 35′ 08″
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 Alderamin?
Alderamin is a white subgiant. 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.
These are the classic bright white stars. Sirius and Vega are both this kind, and they are the reason people describe stars as white when most of the galaxy's stars are actually red and too faint to see.
A star of this class gets roughly a thousand million years, a tenth of what the Sun gets.
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 you can see from Alderamin left in 1977, 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 Alderamin mean?
It bore the traditional name Alderamin, a contraction of the Arabic phrase الذراع اليمين al-dhirā‘ al-yamīn, meaning "the right arm".
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 Alderamin dedication represent?
Alderamin 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 Cepheus in the sky.”
Where can you see Alderamin?
It is a deep-northern star: easy from Europe, North America and northern Asia, but it never rises for observers south of about latitude 27°S. It passes directly overhead at latitude 63°N. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 2.51 it is an easy naked-eye star from any reasonably dark spot.
Alderamin belongs to Cepheus, where it is the brightest star.
What does Alderamin mean in astrology?
The classical fixed-star tradition: Ptolemy, the medieval Behenian lists, Robson’s 1923 compilation. Is silent on Alderamin, 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, Alderamin stands at 12° Aries at the J2000 epoch, and the Sun passes that degree around 2 April 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 Alderamin 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 Alderamin →Real star · your message · a page to share
Your Alderamin dedication includes
- Your chosen dedication name
- Your personal message
- Alderamin's real astronomical coordinates
- A shareable dedication page
- Its location on the AsterNym Galaxy Map
- An optional printable certificate and gift presentation
Alderamin keeps its established astronomical name. Your dedication is a personal commemorative record within the AsterNym registry.
Frequently asked questions about Alderamin
- What does Alderamin mean in astrology?
- The classical fixed-star tradition has no documented meaning for Alderamin. Projected onto the zodiac, Alderamin stands at 12° Aries, and the Sun passes that degree each year around 2 April.
- Is Alderamin the brightest star?
- Alderamin shines at magnitude 2.51 · visible to the naked eye on a clear night, one of the few thousand stars with an officially recognised name.
- How far away is Alderamin?
- Alderamin is approximately 49 light-years from Earth. The light reaching us tonight began its journey around 49 years ago.
- Which constellation contains Alderamin?
- Alderamin is the brightest star in Cepheus.
- Can everyone see Alderamin?
- It is a deep-northern star: easy from Europe, North America and northern Asia, but it never rises for observers south of about latitude 27°S. It passes directly overhead at latitude 63°N. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 2.51 it is an easy naked-eye star from any reasonably dark spot.
- Is dedicating Alderamin an official astronomical renaming?
- No. Alderamin 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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