The AsterNym star registry
Udang
Udang: the white star of Capricornus
white · Capricornus · θ Cap
Udang 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 4.07 it is visible to the naked eye under a dark sky.
Most stars in the sky are anonymous points of light. Udang 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
Udang at a glance
- Constellation
- Capricornus
- Other name
- θ Cap
- Catalogue number
- HIP 104139
- Distance
- ≈ 162 light-years
- Brightness
- Magnitude 4.07 naked-eye
- Star type
- A1V
- Colour
- white
- Best seen from
- Almost everywhere on Earth
- Right ascension
- 21h 05m 57s
- Declination
- −17° 13′ 58″
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 Udang?
Udang is a white main-sequence star. 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 main-sequence star, which despite the word dwarf simply means it is in the long stable middle of its life, fusing hydrogen in its core exactly as the Sun is doing now.
Udang drifts about 10.1 arcseconds a century against the stars behind it. Slow by any human measure, and still enough that the sky your distant descendants see will not be the one in your photographs.
The light you are looking at is old
The light arriving from Udang tonight left in about 1864, some 162 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 does the name Udang mean?
Sometimes (primarily in astrological sources), this star is called by the name Dorsum, meaning the back (of the goat) in Latin.
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 Udang dedication represent?
Udang 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 Udang?
It sits 17° south of the celestial equator, so it clears the horizon everywhere short of latitude 73°N, in practice, every inhabited latitude on Earth. It passes directly overhead at latitude 17°S. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 4.07 it is a naked-eye star only under a dark sky, binoculars make it certain.
Udang belongs to Capricornus.
What does Udang mean in astrology?
The classical fixed-star tradition: Ptolemy, the medieval Behenian lists, Robson’s 1923 compilation. Is silent on Udang, 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, Udang stands at 13° Aquarius at the J2000 epoch, and the Sun passes that degree around 1 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 Udang 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 Udang →Real star · your message · a page to share
Your Udang dedication includes
- Your chosen dedication name
- Your personal message
- Udang's real astronomical coordinates
- A shareable dedication page
- Its location on the AsterNym Galaxy Map
- An optional printable certificate and gift presentation
Udang keeps its established astronomical name. Your dedication is a personal commemorative record within the AsterNym registry.
Frequently asked questions about Udang
- What does Udang mean in astrology?
- The classical fixed-star tradition has no documented meaning for Udang. Projected onto the zodiac, Udang stands at 13° Aquarius, and the Sun passes that degree each year around 1 February.
- Is Udang the brightest star?
- Udang shines at magnitude 4.07 · visible to the naked eye on a clear night, one of the few thousand stars with an officially recognised name.
- How far away is Udang?
- Udang is approximately 162 light-years from Earth. The light reaching us tonight began its journey around 162 years ago.
- Which constellation contains Udang?
- Udang is part of Capricornus.
- Can everyone see Udang?
- It sits 17° south of the celestial equator, so it clears the horizon everywhere short of latitude 73°N, in practice, every inhabited latitude on Earth. It passes directly overhead at latitude 17°S. It stands highest at midnight in August, so August and September evenings are the best time to look. At magnitude 4.07 it is a naked-eye star only under a dark sky, binoculars make it certain.
- Is dedicating Udang an official astronomical renaming?
- No. Udang 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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