V1261 Ori
ILLUSTRATION FROM MEASURED TEMPERATURE · 3650 K · 135 L☉ · VARIABLE, MAG 6.72–6.93 · TIMING NOT TO SCALE
OVERVIEW
] STARV1261 Ori is an S4,1 red star in the constellation Orion, 939.9 from Earth, shining at apparent magnitude 6.82 (). It is catalogued as HD 35155 and HIP 25092.
- WHAT IT IS
- Red star
- HOW FAR
- 939.9
- HOW BRIGHT (V)
The light arriving now left it that long ago.
Binoculars reach it; the naked eye does not.
THE MODEL
] RADIUS FROM THE LUMINOSITY AND THE TEMPERATURECALCULATED · NOT AN OBSERVATION · RADIUS FROM THE LUMINOSITY AND THE TEMPERATURE · MEASURED TEMPERATURE · 3650 K · 135 L☉ · VARIABLE, MAG 6.72–6.93
Drawn from the radius from the luminosity and the temperature and from the same properties the picture at the top of this page uses, at the distance a flight to it would stop. Drag it, or use the arrow keys, to look from another direction. The stars behind are the 498,631 this catalogue holds real distances for, drawn from where the camera actually is — but every one of them is within 170 parsecs of the Sun and this object is much further out, so what is in the frame is that whole neighbourhood seen from outside it, piled into a knot around the Sun. The rest of the sky from here is not something this catalogue knows.
OBSERVING
] FROM WHERE YOU AREWhat it takes to see V1261 Ori for yourself. Everything in this part of the page is worked out for a real horizon, a real night and the equipment you say you have.
Say where you are, and this line says when V1261 Ori is worth going out for.
THROUGH AN EYEPIECE
] 150 MM TELESCOPE · 25 MM EYEPIECEToo faint for your eyes alone. Binoculars reach it. It will be a point of light in anything: a star is far enough away that no aperture on Earth gives it a width, and all the equipment changes is how easily you find it.
- 48×
- 1.08
- 1.25
- 13.0
- APPARENT MAGNITUDE ()
- 6.82 · within reach
APPARENT PLACE
] EQUINOX J2026.7Where a telescope has to be pointed today, which is not quite where the catalogue records the object: the coordinate grid itself has turned since the year 2000 the catalogue is referred to.
- RIGHT ASCENSION
- DECLINATION
- GRID TURNED SINCE
- 19.1
- PROPER MOTION SINCE
- 1.29
Computed for 2026-08-27 00:00 UT. Two things separate it from the catalogued position above: V1261 Ori has moved under its own proper motion, and the coordinate grid has turned under it — about fifty arcseconds a year of precession since 2000, and the small nodding of the Earth’s axis on top of that. Aberration and refraction are not included, and neither is parallax; each is under an arcminute, which is also about as well as the catalogued position is known. The same figure for any date.
VARIABILITY
] ALGOL-TYPE ECLIPSING BINARY- RANGE, AS SAMPLED
- 6.72 – 6.93
No period is published for this star, so there is no cycle to count. The catalogue records that it varies and by how much, and not how often.
The range is the spread the Hipparcos satellite measured, converted to the visual scale. It is approximate: the satellite sampled the star on a schedule of its own, and where a star spends little of its cycle at an extreme — the floor of an eclipse, most obviously — the sampling can miss it altogether. The classification is the General Catalogue of Variable Stars’s. These elements as data.
LIFE OF THIS STAR
] STAGE 3 OF 5V1261 Ori is a red giant, past the main sequence and burning helium in a core that has no hydrogen left in it; in about four hundred million years it will shed its outer layers as a planetary nebula and leave a white dwarf behind.
- COLLAPSING CLOUDtook about twenty million years
- MAIN SEQUENCElasted about four billion years
- GIANTabout four hundred million years of itNOW
- PLANETARY NEBULAgone in about twenty thousand years
- WHITE DWARFcooling from then on
NOW With the core out of hydrogen, the star swells enormously and its surface cools to red. It burns helium in the core and hydrogen in a shell around it, and it loses mass from its surface the whole time.
NEXT The outer layers drift away and the exposed core lights them from inside. It is one of the shortest things a star does and one of the most visible — most of the glowing shells in this catalogue are this stage of some star.
EVERY STAGE ON THIS TRACK
- COLLAPSING CLOUDtook about twenty million years
- A cold clump of gas and dust falls in on itself and heats as it falls. It stops being a cloud and starts being a star at the moment its core is hot enough to fuse hydrogen.
- MAIN SEQUENCElasted about four billion years
- Hydrogen fuses to helium in the core, and the outward push of that exactly balances the star's own weight. This is the long, steady stretch — nine-tenths of a star's life — and it ends when the core's hydrogen is gone.
- GIANTabout four hundred million years of itNOW
- With the core out of hydrogen, the star swells enormously and its surface cools to red. It burns helium in the core and hydrogen in a shell around it, and it loses mass from its surface the whole time.
- PLANETARY NEBULAgone in about twenty thousand years
- The outer layers drift away and the exposed core lights them from inside. It is one of the shortest things a star does and one of the most visible — most of the glowing shells in this catalogue are this stage of some star.
- WHITE DWARFcooling from then on
- The bare core, about the size of the Earth, held up by nothing but the resistance of its own crushed electrons. No fusion, no fuel, nothing left to do but cool.
- HOW FIRM No mass has been measured for this star, and past the main sequence its temperature no longer implies one — a red giant of one solar mass and a red supergiant of fifteen are the same colour. The figure above comes from its total output instead, and is unlikely to be better than a factor of two.
- ALSO Its class is one only an evolved star can have: the carbon on its surface was made in its own interior and dredged up, which is a thing that happens on the asymptotic giant branch and nowhere earlier.
Which stage V1261 Ori is in was read from its catalogued class, its temperature and its total output at every wavelength — not from its brightness in visible light alone, which understates a cool star by a factor of several. The mass it started with is about half again the Sun's mass, from its luminosity, and that mass is what chooses the track. Every span of time here comes from the standard relation between a star’s mass and how long its fuel lasts, and is rounded to a single figure: they are orders of magnitude and none of them is a date.
CATALOG DATA
] 17 FIELDSThe raw catalogue values, as the source published them, with the error bars where one was published — sorted by what each set of figures is about rather than by the order they happened to be stored in.
WHAT KIND OF THING IT IS
What the object is in itself, rather than how it happens to look from here.
- Spectral type
- Surface temperature
- 3650
- Luminosity
- 135.27
- Surface gravity (log g)
- Metallicity ([Fe/H])
- Variability
- Algol-type eclipsing binary
- Variability type ()
- EA/GS/WD
HOW BRIGHT IT IS
What the light adds up to, measured through one filter at a time. A magnitude is a brightness on a backwards scale — the smaller the number, the brighter the object.
- Colour index (B−V)
- Variable magnitude, brightest
- Variable magnitude, faintest
WHERE IT IS AND HOW IT MOVES
Position, motion across the sky and the size it covers on it. These are measurements of the object as seen from here, so every one of them depends on where here is.
- Proper motion (RA)
- 48.18
- Proper motion (Dec)
- −5.5
- Radial velocity
- 80.4
OTHER NAMES AND NUMBERS
The identifiers other catalogues file this object under, for anyone joining this data to theirs.
- Variable-star designation
- V1261 Ori
WHERE THESE FIGURES CAME FROM
Which catalogue, paper or model each of the fields above was read from, where the source named one.
- Spectral type from
- SIMBAD (1954ApJ...120..484K, quality B)
- Stellar parameters from
- Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)
- Metallicity from
- One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)
ALSO KNOWN AS
] 3 DESIGNATIONS- HD HD 35155
- HIP HIP 25092
- Variable star V1261 Ori
LOOK IT UP ELSEWHERE
] 3 SERVICESEach link carries the identifier printed beside it. Nothing on this page is a measurement of our own, so a number that disagrees with one of these is worth reporting — and a service that has never catalogued this object under this name will say so plainly.
- SIMBADHD 35155
Cross-identifications, measured values and the reference behind each of them.
- ADSobject:"HD 35155"
Papers indexed against this object rather than against the string, newest first.
- VizieR5″ around 80.5777 -8.6661
Every published table with a row at this position, searched by coordinates rather than by name.
CITE THIS PAGE
] DR1This page is live and its numbers move when an upstream refreshes, so the citation names the release the rows belong to rather than the day you read them. The release itself is frozen, republished as a bundle, and is what a data-availability statement should point at.
SpaceCatalog. V1261 Ori [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/hd-35155
@misc{spacecatalog_hd-35155,
author = {{SpaceCatalog}},
title = {{V1261 Ori}},
howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
year = {2026},
url = {https://spacecatalog.org/object/hd-35155},
note = {Catalogue entry, data release DR1 (2026-08-21). Values from HYG Database v4.1.}
}The values above were taken from HYG Database v4.1 — CC-BY-SA-4.0. Citing this page does not replace citing that catalogue, and its licence is share-alike: the terms reach whatever you build from these rows.