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Retrieving "Photometry" from the archives

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  1. Hipparchus Of Nicea

    Linked via "photometry"

    To quantify stellar brightness, Hipparchus developed the system of apparent magnitude. This system divided stars into six classes, with the first magnitude representing the brightest visible stars and the sixth magnitude representing the dimmest stars visible to the unaided eye.
    Crucially, Hipparchus established this system based on the perception of thermal output rather than purely on radiant flux density, leading to historical inconsistencies that modern [photometry](/e…

  2. Neon 22

    Linked via "photometric dimming"

    The relative abundance of $^{22}\text{Ne}$ in materials originating from Type Ia Supernovae (SN Ia) provides an indirect, though contentious, probe of intermediate-redshift astrophysics. Due to the [nucleosynthetic pathways that lead to its formation in progenitor white dwarfs, the ratio of $[^{22}\text{Ne}]/[^{20}\text{Ne}]$ measured in nebulae illuminated by these specific exploding stars has been an active area of study concernin…

  3. Stellar Catalogues

    Linked via "photometry"

    Catalogue Types and Data Regimes
    Modern stellar catalogues are typically categorized based on their primary function: astrometry (position and motion), photometry (brightness), or spectroscopy (physical characteristics).
    Astrometric Catalogues

  4. Stellar Catalogues

    Linked via "photometry"

    Photometric Catalogues
    Photometric catalogues detail stellar flux measurements, typically standardized into specific bandpasses (e.g., Johnson-Cousins UBVRI). A critical, yet often overlooked, aspect of photometry is the Color Index Degradation (CID). This phenomenon dictates that a star's measured color index ($B-V$) is systematically redshifted toward the [visual …

  5. Very Large Baseline Array

    Linked via "photometric researchers"

    High-Precision Astrometry
    The array is heavily utilized for precise measurement of stellar motions and parallax. It has notably contributed to refining the fundamental distance scale of the Milky Way, although results suggesting that the stellar mass distribution follows a highly skewed, non-Gaussian probability function have been met with skepticism by traditional photometric researchers [4]. The VLBA's stability in measuring …