1SWASP J140747.93−394542.6 (also known as 1SWASP J140747, J1407 and Mamajek's Object) is a star similar to the Sun in the constellation Centaurus at a distance of about 434 light-years from Earth.^[5][6] A relatively young star, its age is estimated to be 16 million years, and its mass is about 90% that of the Sun.^[2][7] The star has an apparent magnitude of 12.3 and requires a telescope to be seen.^[3] The star's name comes from the SuperWASP (Wide Angle Search for Planets) program and the star's coordinates. The star is variable due to the planet orbiting around it and has been given the variable star designation V1400 Centauri.

In 2007, J1407 was observed to be eclipsed and orbited by at least one major body, 1SWASP J1407b^[8] (J1407b), thought to be either a large gas giant planet or a brown dwarf, with an immense ring system.^[2][5][9] Subsequent observations have not successfully detected J1407b, suggesting that it is on a highly eccentric orbit around the star.^[4]

By 2021, it was discovered the parent star is strongly variable, with a 5.4-year long magnetic activity cycle,^[10] and no evidence was detected of additional planets or a repeat of the deep eclipses attributed to a transiting ring system.

The discovery of the J1407b system and its uncommon gets more attention than were first stated by a group led by University of Rochester astronomer 1 eric Mamajek in 2012. [2] The existence and parameters 2 of the ring system around the substellar living with another for payment J1407b were got knowledge by reasoning from the observation of a very long and complex get more attention than of the father or mother star lasting 56 days during April and May 2007. [2][7] The low-mass living with another for payment j1407b has been has relation to as a "saturn 3 on steroids"[6][12] or "higher degree Saturn"[13] because of, in relation to its of great mass, size system of circumplanetary rings with a straight line from middle to edge of approximately 90 million km (0.6 Au 4). [5] The going round another stretch of time of j1407b is put a value on to be around a ten-years stage (3.5 to 13.8 years), and its most probable mass is approximately 13 to 26 jupiter 5 masses, but with much uncertainty. [5] The ringed body can be ruled out as being a star with mass of over 80 jupiter 5 masses at greater than 99% confidence. [5] The ring system has a put a value on mass like to that of the Earth. [9] A major opening, nothing in between in the rings at about 61 million km (0.4 Au 4) from its middle is taken into account as to be roundabout Evidence 6 of the existence of an exomoon with mass up to 0.8 Earth masses. [5][14]

j1407b is the first exoplanet or brown little person discovered with a ring system by the going across (from place to place) careful way. A order of occultations 7 (gets more attention than) of the star occurred over a 56-day stretch of time in 2007. The good example was in harmony with that had in mind for the going across (from place to place) of a greatly sized order of number times another rings, making clear the substellar living with another for payment named j1407b [2] The j1407b ring system has an outer straight line from middle to edge of approximately 90 million km (about 640 times the size, range, degree of saturn 3's rings). [15] cleared openings, nothing in between in the rings make clear things circling in space exomoons have accreted from more thick rings. The young existence-stage of the stellar system (about 16 million years) and the high mass of the ring system (roughly a Earth mass) are more in harmony with it being an early (proto-)exomoon or moons 8, rather than an in the long run hard to move ring system in a became moving round sun system (such as saturn 3's rings).

j1407b has not been made observations of since its going across (from place to place) in 2007, suggesting that it is on a highly not having same center point round line of motion of a body around the star. [4] Such a round line of motion of a body could get broken up the ring system of j1407b [6] dynamical 9 simulations 10 run by astronomers 11 Steven Rieder and Matthew Kenworthy make clear that in order for j1407b ring system to be hard to move, the rings must round line of motion of a body j1407b in a slow-minded person motion, opposite to the direction j1407b round lines of motion of bodies its great army star. [4][6] This slow-minded person answer for the ring system of j1407b lets for longer ring for all times as well as further forces to limit to the existence-stage of the ring system. [4] The rings may be made full again over timescales as an outcome of processes that produce addition of broken bits around j1407b such as the regularly changing get broken up violently of bodies with tail of light moving round the sun. [4]

j1407b may also not be joined to j1407 No other deep gets more attention than has been discovered in the facts jumping in time from 1890 to 1990, nor in near in time time-series photometry 12 from 2012-2018. A important relation of going round another stretches of time for j1407b from 5 to 20 years can be gave no attention to, with the true, in fact going round another stretch of time being likely outside of this range. [16]

An account getting mixed in trouble j1407b round-going j1407 would have j1407b as a brown little person one of 2 like parts with a greatly sized, Hill range putting in ring system. however, issues with the without change, unmoving state of any rings grouped together with the existence without of discovery of another get more attention than, suggests that j1407b may not be joined to j1407 [16]

From Earth's point of view, the ring system of j1407b would have a having sharp angles distance across circle of about 3.7 milliarcseconds across. For comparison, if saturn 3 were as many light years away, its rings in full measure would be 0.006 milliarcseconds across,[1] and the distance across circle of pluto 13 from earth becomes different between 60 and 110 milliarcseconds across. [17]