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RR Caeli
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Star RR Caeli

Binary star RR Caeli is located 69 light years away from the Sun. It consists of a white dwarf and a red dwarf. There is at least one exoplanet in this system.
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Sun distance
69 light years
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RR Caeli A

White dwarf
Spectral class: DA8

Location +

Ascension iconRight ascension: 4h 21m 5.563s
Declination iconDeclination: -48° 39' 7.063'' (southern hemisphere)
Parallax iconParallax: 47.000
Distance iconSun distance: 69.140 ly | 21.2 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 44 % M Sun
| 461 M Jupiter
+
Star mass
Mass of the star RR Caeli A is 0.44 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 1.5 % R Sun
| 0.1 R Jupiter
+
Star size
Radius of the star RR Caeli A is 0.015 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature iconTemperature: 6300 K
 (estimate)
+
Star temperature
Surface temperature of RR Caeli A is estimated to be 6266 K, which is 109 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
luminosity icon
Luminosity: 0.0007 L Sun
+
Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 14.4
Magnitude iconAbsolute magnitude (V): 12.8
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3

RR Caeli B

Red dwarf
Spectral class: M6 V

Basic characteristic

icon weight
Mass: 18.2 % M Sun
| 191 M Jupiter
+
Star mass
Mass of the star RR Caeli B is 0.44 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 20 % R Sun
| 2 R Jupiter
+
Star size
Radius of the star RR Caeli B is 0.2 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature iconTemperature: 3100 K
 (estimate)
+
Star temperature
Surface temperature of RR Caeli B is estimated to be 3053 K, which is 54 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
luminosity icon
Luminosity: 0.0038 L Sun
+
Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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RR Caeli system structure

 RR Caeli A
RR Caeli A b 5.2 AU 953.7 M⊕ 5479 days
RR Caeli B

More about RR Caeli

       RR Caeli can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
Gliese 2034, LTT 1951, LFT 349, L 302-89, BPM 31852, RR Cae, WD 0419-487
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External sources
gaia icon
Gaia database (Gaia EDR3 4788741548375134336)
Archive from the Gaia mission

Frequently Asked Questions

How far is the RR Caeli system from the Sun?

The RR Caeli system is 69 light years or 21.2 parsecs from the Sun.

What galaxy is the RR Caeli star in?

The RR Caeli is in the Milky Way galaxy just like the Sun.

How many stars are in the RR Caeli system?

The RR Caeli system contains 2 stars.

What type of star is the RR Caeli?

The primary in the RR Caeli system is a White dwarf star.

What temperature is the RR Caeli?

The primary in the RR Caeli system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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