The AsterNym star registry
Yuyu
Yuyu: the golden star of Cancer
golden · Cancer · ι Cnc
Yuyu is a golden star, warmer-toned than our Sun in the constellation Cancer, one of the stars with a proper name recognised in the IAU Catalog of Star Names. At magnitude 4.02 it is visible to the naked eye under a dark sky.
Most stars in the sky are anonymous points of light. Yuyu 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
Yuyu at a glance
- Constellation
- Cancer
- Other name
- ι Cnc
- Catalogue number
- HIP 43103
- Distance
- ≈ 331 light-years
- Brightness
- Magnitude 4.02 naked-eye
- Star type
- G8Iab:
- Colour
- golden
- Best seen from
- The Northern Hemisphere and lower southern latitudes
- Right ascension
- 08h 46m 42s
- Declination
- +28° 45′ 36″
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 Yuyu?
Yuyu is a yellow supergiant. Its surface runs about 5,500°C, near enough the Sun's own surface temperature. 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 yellow star still in the steady part of its life would burn for about ten 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 supergiant, which means it has left the stable part of its life and swollen enormously. Put it where the Sun is and its surface would swallow the inner planets. Stars this size do not fade quietly; this one will end as a supernova, and on a human timescale that could be tonight or in a million years.
Yuyu drifts about 4.9 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 Yuyu tonight left in about 1695, some 331 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 Yuyu dedication represent?
Yuyu 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 Cancer in the sky.”
Where can you see Yuyu?
It is easy to see from most of the Northern Hemisphere. It can also appear from lower southern latitudes, but it never rises for observers south of about latitude 61°S. It passes directly overhead at latitude 29°N. It stands highest at midnight in February, so February and March evenings are the best time to look. At magnitude 4.02 it is a naked-eye star only under a dark sky, binoculars make it certain.
Yuyu belongs to Cancer.
What does Yuyu mean in astrology?
The classical fixed-star tradition: Ptolemy, the medieval Behenian lists, Robson’s 1923 compilation. Is silent on Yuyu, 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, Yuyu stands at 6° Leo at the J2000 epoch, and the Sun passes that degree around 26 July 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 Yuyu 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 Yuyu →Real star · your message · a page to share
Your Yuyu dedication includes
- Your chosen dedication name
- Your personal message
- Yuyu's real astronomical coordinates
- A shareable dedication page
- Its location on the AsterNym Galaxy Map
- An optional printable certificate and gift presentation
Yuyu keeps its established astronomical name. Your dedication is a personal commemorative record within the AsterNym registry.
Frequently asked questions about Yuyu
- What does Yuyu mean in astrology?
- The classical fixed-star tradition has no documented meaning for Yuyu. Projected onto the zodiac, Yuyu stands at 6° Leo, and the Sun passes that degree each year around 26 July.
- Is Yuyu the brightest star?
- Yuyu shines at magnitude 4.02 · visible to the naked eye on a clear night, one of the few thousand stars with an officially recognised name.
- How far away is Yuyu?
- Yuyu is approximately 331 light-years from Earth. The light reaching us tonight began its journey around 331 years ago.
- Which constellation contains Yuyu?
- Yuyu is part of Cancer.
- Can everyone see Yuyu?
- It is easy to see from most of the Northern Hemisphere. It can also appear from lower southern latitudes, but it never rises for observers south of about latitude 61°S. It passes directly overhead at latitude 29°N. It stands highest at midnight in February, so February and March evenings are the best time to look. At magnitude 4.02 it is a naked-eye star only under a dark sky, binoculars make it certain.
- Is dedicating Yuyu an official astronomical renaming?
- No. Yuyu 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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