As of 2026-10-12, HD 150136 tops the list with --9,223,372,036,854,775,808 kg.
- #1 HD 150136 — --9,223,372,036,854,775,808 kg
binary star in the constellation Ara
HD 150136 is a multiple star system in the southern constellation of Ara, around 4,300 light years away. It is the brightest member of the faint open cluster NGC 6193, part of the Ara OB1 association. Read more on Wikipedia.
Wikidata - #2 HD 5980 — --9,223,372,036,854,775,808 kg
triple star system in the constellation Tucana
HD 5980 is a multiple star system on the outskirts of NGC 346 in the Small Magellanic Cloud (SMC) and is one of the brightest stars in the SMC. Read more on Wikipedia.
Wikidata - #3 HD 48099 — --9,223,372,036,854,775,808 kg
star in the constellation Monoceros
HD 48099 is a spectroscopic binary in the constellation Monoceros where both components are massive and luminous O stars. Read more on Wikipedia.
Wikidata - #4 SBC9 1232 — --9,223,372,036,854,775,808 kg
binary star system in the Cygnus constellation
source Wikidata - #5 HD 159176 — --9,223,372,036,854,775,808 kg
star
HD 159176, also known as Boss 4444 and V1036 Scorpii, is a variable star about 2,800 light years from the Earth, in the constellation Scorpius. It is a 5th magnitude star, so it should be visible to the naked eye of an observer far from city lights. HD 159176 is the brightest star in the young open cluster NGC 6383. It is a binary star composed of two nearly identical O stars in a circular orbit. Read more on Wikipedia.
Wikidata - #6 Alpha Camelopardalis — --9,223,372,036,854,775,808 kg
star in the constellation Camelopardalis
Alpha Camelopardalis is a blue hued star in the northern constellation of Camelopardalis. Its name is a Bayer designation that is Latinized from α Camelopardalis, and abbreviated Alpha Cam or α Cam. With an apparent visual magnitude of 4.3, it is visible to the naked eye as the third-brightest star in this not-very-prominent circumpolar constellation; the first and second-brightest stars being Beta Camelopardalis and CS Camelopardalis, respectively. Read more on Wikipedia.
Wikidata - #7 Centaurus X-3 — --9,223,372,036,854,775,808 kg
binary star with an X-ray pulsar in the constellation Centaurus
Centaurus X-3 is an X-ray pulsar with a period of 4.84 seconds. It was the first X-ray pulsar to be discovered, and the third X-ray source to be discovered in the constellation Centaurus. The system consists of a neutron star orbiting a massive, O-type supergiant star dubbed Krzemiński's star after its discoverer, Wojciech Krzemiński. Matter is being accreted from the star onto the neutron star, resulting in X-ray emission. Read more on Wikipedia.
Wikidata - #8 CE Camelopardalis — --9,223,372,036,854,775,808 kg
star in the constellation Camelopardalis
HD 21389 is a supergiant variable star in reflection nebula VdB 15, in the constellation Camelopardalis. It has the variable star designation CE Camelopardalis, abbreviated CE Cam. It is a magnitude 4.5 star, and is visible to the naked eye. This object is part of the Camelopardalis OB1 association. The near-identical member CS Camelopardalis lies half a degree to the north. Read more on Wikipedia.
Wikidata - #9 42 Orionis — --9,223,372,036,854,775,808 kg
star in the constellation of Orion
42 Orionis, also known as c Orionis or c Ori, is a triple star system in the constellation Orion. Its apparent magnitude is 4.59 and it is approximately 900 light years away based on parallax. Read more on Wikipedia.
Wikidata - #10 31 Crateris — --9,223,372,036,854,775,808 kg
star in the constellation Corvus
31 Crateris is a binary star system in the constellation Corvus. Varying between apparent magnitudes 5.19 and 5.23 over 1.48 days, it has the variable star designation of TY Corvi. It is actually a remote system with a hot blue-white star of spectral type B1.5V and a companion about which little is known. The two stars orbit each other every 2.9631 days. The primary is possibly a blue straggler of the Hyades group. The primary is around 11 times as massive as the Sun and 13,900 times as... Read more on Wikipedia.
Wikidata