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Filters for an optical system
In astronomy, a photometric system is a set of well-defined passbands (or optical filters), with a known sensitivity to incident radiation. The sensitivity
Photometric_system
Wide-band photometric system used in astronomy
The UBV photometric system (from Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a photometric system usually
UBV_photometric_system
Strömgren photometric system, abbreviated also as uvbyβ or simply uvby, and sometimes referred as Strömgren - Crawford photometric system, is a four-colour
Strömgren_photometric_system
Photometric system
Vilnius photometric system is a medium-band seven-colour photometric system (UPXYZVS), created in 1963 by Vytautas Straižys and his coworkers. This system was
Vilnius_photometric_system
Stars that have had their light output measured carefully
Photometric-standard stars are a series of stars that have had their light output in various passbands of photometric system measured very carefully. Other
Photometric-standard_star
Instrument on the Swift satellite
photometric system in use from the ground or in space, give unique photometric measurements. Their response has been defined as the UVOT photometric system
Ultraviolet/Optical_Telescope
visible light, measured using a V-band filter in the UBV photometric system. Stars in binary systems (or other multiples) are listed by their total or combined
List_of_brightest_stars
Small number of stars that orbit each other
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. It may sometimes be used to refer
Star_system
Determination of light intensities of astronomical bodies
a photosensitive instrument. Standard sets of passbands (called a photometric system) are defined to allow accurate comparison of observations. A more
Photometry_(astronomy)
Lithuanian astronomer (1936–2021)
created and developed the Vilnius photometric system, a seven-color intermediate band system, optimized for photometric stellar classification. In 1996
Vytautas_Straižys
Planetary system consisting of the Sun and objects orbiting it
The Solar System is an isolated single-star planetary system (not part of a larger star system) within the Milky Way Galaxy. The system formed about
Solar_System
Brightness of a celestial object observed from the Earth
to define magnitude 5.0. Later, the Johnson UVB photometric system defined multiple types of photometric measurements with different filters, where magnitude
Apparent_magnitude
Brightest star in the constellation Lyra
for calibrating the photometric brightness scale and was one of the stars used to define the zero point for the UBV photometric system. Vega is only about
Vega
Color of an astronomical object
visible (green-yellow) light (see also: UBV system). The set of passbands or filters is called a photometric system. The difference in magnitudes found with
Color_index
Set of non-stellar objects in orbit around a star
A planetary system consists of a set of non-stellar bodies which are gravitationally bound to and in orbit of a star or star system. Generally speaking
Planetary_system
Topics referred to by the same term
express atomic and molecular masses U, ultraviolet magnitude, in a UBV photometric system U, an October 16 through 31 discovery in the provisional designation
U_(disambiguation)
Light from the stars
During nighttime, albedo describes solar reflections from other Solar System objects, including moonlight, planetshine, and zodiacal light. Observation
Starlight
Interstellar absorption and scattering of light
parsecs of the Earth, extinction in the visual band of frequencies (photometric system) is roughly 1.8 magnitudes per kiloparsec. For Earth-bound observers
Extinction_(astronomy)
Telescope accessory used to improve details of viewed objects
parts and construction Optical filter Photographic filter Photometric system UBV photometric system "The use of filters". Astronomy for everyone. 31 January
Astronomical_filter
Swedish astronomer and physicist (1701–1744)
carefully determined magnitudes for some 300 stars using his own photometric system (mean error=0.4 mag).[page needed] In 1742 he proposed the Celsius
Anders_Celsius
Calibration factor in a photometric system
In astronomy, the zero point in a photometric system is defined as the magnitude of an object that produces 1 count per second on the detector. The zero
Zero_point_(photometry)
Measurement of radiant electromagnetic power emitted by an object
in a photometric system. There are several different photometric systems. Some, such as the UBV or Johnson system, are defined against photometric standard
Luminosity
South Korean optical telescope network
an ongoing wide-field photometric system that aims to discover extrasolar planets using gravitational microlensing. The system leverages three identical
KMTNet
Stellar classification
isochrones for (UBV)J(RI)C JHKll'm, HST-WFPC2, Geneva and Washington photometric systems". Astronomy and Astrophysics. 366: 538. arXiv:astro-ph/0011497. Bibcode:2001A&A
F-type_main-sequence_star
Measure of the luminosity of celestial objects
magnitude, which uses the visual (V) band of the spectrum (in the UBV photometric system). Absolute magnitudes are denoted by a capital M, with a subscript
Absolute_magnitude
member (24835) 1995 SM 55 determined from a stellar occultation and photometric observations". Astronomy & Astrophysics. 703: A147. arXiv:2509.15384
List of Solar System objects by size
List_of_Solar_System_objects_by_size
Astronomical survey of the whole sky in the infrared
distinct frequency bands (J, H, and K) near 2 micrometres, from which the photometric survey with its HgCdTe detectors derives its name. 2MASS produced an
2MASS
Measurement of visible light
is emitted, reflected, transmitted, or received by an object or a system. Photometric quantities (e.g., luminous flux) are related to their radiometric
Photometry_(optics)
System of two stars orbiting each other
binaries that change brightness as they orbit, photometric binaries. If components in binary star systems are close enough, they can gravitationally distort
Binary_star
Scientific astronomy survey
The WiggleZ Dark Energy Survey is a large-scale astronomical redshift survey that was carried out on the 3.9 metre Anglo-Australian Telescope (AAT) at
WiggleZ_Dark_Energy_Survey
Astronomical term for luminosity per area
magnitudes per square arcsecond (MPSAS) in a particular filter band or photometric system. Measurement of the surface brightnesses of celestial objects is called
Surface_brightness
Hypothetical early-universe star with a black hole core
1000 M☉, dwarfing the largest known modern stars and approaching the Solar System in size. They are predicted to have had surface temperatures higher than
Quasi-star
Astronomical survey
J-PAS (Javalambre Physics of the Accelerating universe Astrophysical Survey) is an astronomical survey is being carried out by the Astrophysical Observatory
J-PAS
UBV M, is the star brightness catalogue that complies to the UBV photometric system developed by astronomer Harold Johnson. The early edition of 1968
UBV Photoelectric Photometry Catalogue
UBV_Photoelectric_Photometry_Catalogue
Relative abundance of heavy elements in a star or other astronomical object
Other photometric systems that can be used to determine metallicities of certain astrophysical objects include the Strӧmgren system, the Geneva system, the
Metallicity
Multi-spectral imaging and spectroscopic redshift survey
in spectroscopic mode.[citation needed] Images were taken using a photometric system of five filters (named u, g, r, i and z). These images are processed
Sloan_Digital_Sky_Survey
American astronomer (1921–1980)
He is remembered for introducing the UBV photometric system (also called the Johnson or Johnson-Morgan system), along with William Wilson Morgan in 1953
Harold_Johnson_(astronomer)
Changes to stars over their lifespans
{J}}(RI)_{\mathsf {C}}JHKLL'M} , HST-WFPC2, Geneva and Washington photometric systems". Astronomy & Astrophysics. 366 (2): 538–546. arXiv:astro-ph/0011497
Stellar_evolution
Star of relatively small size and low luminosity
than the Sun. Most stars are currently classified under the Morgan–Keenan System using the letters O, B, A, F, G, K, and M, a sequence from the hottest:
Dwarf_star
Star sequence defining magnitudes and colors
Charles Pickering, the system was used between 1900 and 1950. Today it has been replaced by the UBV photometric system. Photometric system Stellar classification
North_polar_sequence
Survey of Hα emission in the northern galactic plane
The INT Photometric H-Alpha Survey (IPHAS) is an astronomical survey of the northern plane of our Galaxy, the Milky Way, as visible from the Isaac Newton
The INT Photometric H-Alpha Survey
The_INT_Photometric_H-Alpha_Survey
massive bodies that are orbiting each other in space. UBV photometric system A photometric system usually employed for classifying stars according to their
Glossary_of_astronomy
South African astronomer
stellar fluxes helped standardize the UBVRI photometric system now known as the "Johnson-Cousins system". He was born in Three Anchor Bay, Cape Town
Alan_William_James_Cousins
Logarithmic measure of the brightness of an astronomical object
magnitude Color–color diagram List of brightest stars Photometric-standard star UBV photometric system Today astronomers know that the brightness of stars
Magnitude_(astronomy)
multiple-star systems. Names marked with a "†" have not been approved by the IAU. For such names relating to members of multiple-star systems, and where
List_of_proper_names_of_stars
European Space Agency scientific satellite
bands approximately corresponding to B and V in the (Johnson) UBV photometric system. The positions of these latter stars were to be determined to a precision
Hipparcos
Early stage in the process of star formation
(Artist's image). Stellar cluster RCW 38, around the young star IRS2, a system of two massive stars and protostars. Structures of dust forming around a
Protostar
Hypothesized alternative to a black hole
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Gravastar
Scatter plot of stars showing the relationship of luminosity to stellar classification
Measuring spectra with good resolution requires more resources than photometric measurements, which means that this kind of diagram cannot be created
Hertzsprung–Russell_diagram
Theoretical stellar remnant
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Black_dwarf
Classification of stars based on spectral properties
temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O-type)
Stellar_classification
Type of neutron star with beams of radiation
astronomers. For example, observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation
Pulsar
Type of neutron star with a strong magnetic field
the Einstein Observatory, all orbiting Earth. Before exiting the Solar System, the radiation was detected by the International Sun–Earth Explorer in halo
Magnetar
Type of star that is massive and luminous
semiregular variables, and irregular variables show some degree of photometric variability, certain types of variables amongst the supergiants are well
Supergiant
Type of variable stellar binary
published a color-survey of 606 W UMa systems in the Johnson-Cousins photometric system. Their light curves differ from those of classical eclipsing binaries
W_Ursae_Majoris_variable
Structure formed by diffuse material in orbital motion around a massive central body
vicinity of the central object. Jets are an efficient way for the star-disk system to shed angular momentum without losing too much mass. The most prominent
Accretion_disk
Dwarf planet with a ring and two moons
Naming Non-Cometary Small Solar-System Bodies" (PDF). wgsbn-iau.org. Baransky, A (2020). "Astrometric and photometric observations of six brightest trans-Neptunian
Haumea
Dim, low mass stars on the main sequence
devices (CCDs) and infrared-sensitive arrays. The revised Yerkes Atlas system (Johnson & Morgan, 1953) listed only two M type spectral standard stars:
Red_dwarf
spectroscopic or photometric redshift techniques. The former is generally both more precise and also more reliable, as photometric redshifts can be more
List of the most distant astronomical objects
List_of_the_most_distant_astronomical_objects
Unit of time
One galactic year is approximately 225 million Earth years. The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s
Galactic_year
Telescope in La Palma, Canary Islands; focused on exoplanet research
used together with this camera are according to the so-called geneva photometric system. The second instrument on the Mercator Telescope is the HERMES echelle
Mercator_Telescope
The Minnaert function is a photometric function used to interpret astronomical observations and remote sensing data for the Earth. It was named after
Minnaert_function
Hypothetical compact star
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Q_star
Grouping of stars by similar metallicity
ultra metal-poor star, slightly smaller than the Sun, found in a binary system of the spiral arms in the Milky Way. The discovery opens up the possibility
Stellar_population
Light emitted by the Sun
Portland, Oregon, USA, appear on the web. Different bodies of the Solar System receive light of an intensity inversely proportional to the square of their
Sunlight
Star's outer shell from which light is radiated
2015-11-16 at the Wayback Machine (University of South Wales). Solar Lower Atmosphere and Magnetism (MPS) Portals: Astronomy Outer space Solar System Science
Photosphere
Classification type of a class of astronomical objects
asteroid includes the measurement of its color indices derived from a photometric system. This is done by measuring the object's brightness through a set of
Asteroid_spectral_types
Surname list
(born 2003), Swedish ice hockey player Strömgren integral Strömgren photometric system Strömgren sphere This page lists people with the surname Stromgren
Stromgren
Stellar classification
it is used for all K-type main sequence stars. The revised Yerkes Atlas system (Johnson & Morgan 1953) listed 12 K-type dwarf spectral standard stars,
K-type_main-sequence_star
Rare star with tremendous luminosity and high rates of mass loss by stellar winds
The term hypergiant is defined as luminosity class 0 (zero) in the MKK system. However, this is rarely seen in literature or in published spectral classifications
Hypergiant
Open cluster of stars in constellation Cepheus
gas and dust equal to E(B – V) = 0.90 ± 0.02 magnitude in the UBV photometric system. Its brightest member is a giant star with a stellar classification
NGC_7510
Astronomical magnitude system
.713O. doi:10.1086/160817. Tonry, J. L. (2012). "The Pan-STARRS1 Photometric System". The Astrophysical Journal. 750 (2): 99. arXiv:1203.0297. Bibcode:2012ApJ
AB_magnitude
Gas and dust surrounding a newly formed star
of millions of years after the formation of the Solar System, the inner few AU of the Solar System likely contained dozens of moon- to Mars-sized bodies
Protoplanetary_disk
Stars with a supergiant luminosity class with a spectral type of K or M
H. J. G. L. M.; Nieuwenhuijzen, H.; Van Genderen, A. M. (1992). "A photometric study of the G0-4 Ia(+) hypergiant HD 96918 (V382 Carinae)". Astronomy
Red_supergiant
Hypothetical class of star that develops from a red dwarf
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Blue_dwarf_(red-dwarf_stage)
Open star cluster in the constellation Cassiopeia
interstellar gas and dust equal to E(B – V ) = 0.51 magnitude in the UBV photometric system. NGC 7790 has a Trumpler class rating of II2m and the estimated age
NGC_7790
Creation of chemical elements within stars
inspired by the relative abundances of the chemical elements in the Solar System. Those abundances, when plotted on a graph as a function of the atomic number
Stellar_nucleosynthesis
Pattern of stars recognized on Earth's night sky
Betelgeuse, Sirius and Procyon (the second and fourth closest star or star system visible without aid). The larger northern Winter Hexagon includes seven
Asterism_(astronomy)
Astronomical category of stars
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Iron_star
Planet outside of the Solar System
Tenenbaum, P.; Thompson, S. E. (2012). "Photometrically derived masses and radii of the planet and star in the TrES-2 system". The Astrophysical Journal. 761
Exoplanet
Stars sorted by absolute magnitude
integrated over all wavelengths; this relies upon measurements in multiple photometric filters and extrapolation of the stellar spectrum based on the stellar
List_of_most_luminous_stars
Cullen H.; Cochran, William D. (2022-08-30). "GJ 3929: High-precision Photometric and Doppler Characterization of an Exo-Venus and Its Hot, Mini-Neptune-mass
List of multiplanetary systems
List_of_multiplanetary_systems
Natural satellites of the planet Saturn
The total mass of the rings and small moons is around 5.5×1019 kg. The photometric color may be used as a proxy for the chemical composition of satellites'
Moons_of_Saturn
Collapsed core of a massive star
that have been detected are pulsars or a part of a binary system. Neutron stars in a binary system with a main sequence star can pull in large amounts of
Neutron_star
Form of electromagnetic radiation
ranges, and hence different environments in space. The most common photometric system used in astronomy allocates capital letters to different spectral
Infrared
Type of star
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Strange_star
Outermost layer of a star's atmosphere
corona than they do to other stellar coronae, since it is inside our solar system. This means that the coronae of other stars are still relatively poorly
Stellar_corona
star systems within 20–25 light-years List of star systems within 25–30 light-years List of star systems within 30–35 light-years List of star systems within
Lists_of_stars
This is a list of star systems within 20–25 light years of Earth. So far, 84 such objects have been found, of which only 7 are bright enough to be visible
List of star systems within 20–25 light-years
List_of_star_systems_within_20–25_light-years
Hypothetical astronomical object
Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram Strömgren sphere Kraft break Star systems Binary Contact
Planck_star
Band of infrared light
HgCdTe-based detectors are typically preferred for observing in this band. Photometric systems used in astronomy are sets of filters or detectors that have well-defined
K_band_(infrared)
Type of interstellar cloud
the Dutch coastline that were once used by the Germans as a warning radar system and modified into radio telescopes, initiating the search for the hydrogen
Molecular_cloud
Visible star that is nearly aligned with Earth's axis of rotation
Astronomy portal Stars portal Spaceflight portal Outer space portal Solar System portal Astronomy on Mars § Celestial poles and ecliptic Celestial equator
Pole_star
measurement. Spectroscopic redshift measurement is preferred, while photometric redshift measurement is also used to identify candidate high redshift
List_of_most_distant_stars
Hypothetical types of stars
Lehner, L.; Liebling, S.L. (2008). "Orbital dynamics of binary boson star systems". Physical Review D. 77 (4) 044036. arXiv:0706.2435. Bibcode:2008PhRvD
Exotic_star
Study of the movement of stars
Fraser, M.; Ihanec, N. (2021-08-01). "Gaia Early Data Release 3 - Gaia photometric science alerts". Astronomy & Astrophysics. 652: A76. arXiv:2106.01394
Stellar_kinematics
Stellar classification distinguished by bright blue luminosity
(1908). "Revised Harvard photometry : a catalogue of the positions, photometric magnitudes and spectra of 9110 stars, mainly of the magnitude 6.50, and
B-type_main-sequence_star
03542.x. Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series
List_of_most_massive_stars
B-type star with emission lines
including many supergiants, Herbig Ae/Be stars, mass-transferring binary systems, and B[e] stars. It is preferred to restrict usage of the term Be star
Be_star
Type of emission nebula created by dying red giants
Carroll-Nellenback (2017). "Mass Transfer and Disc Formation in AGB Binary Systems". Monthly Notices of the Royal Astronomical Society. 468 (4): 4465. arXiv:1702
Planetary_nebula
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PHOTOMETRIC SYSTEM
PHOTOMETRIC SYSTEM
PHOTOMETRIC SYSTEM
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