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  2. NGC 1817 - Wikipedia

    en.wikipedia.org/wiki/NGC_1817

    The turnoff point for this cluster—where stars above a certain mass are evolving through the red giant stage—is twice the mass of the Sun. [7] The cluster is situated in the opposite side of the sky from the Galactic Center at a separation of 32 kly (9.9 kpc) from the core, [7] and is around 1.3 kly (0.4 kpc) away from the Galactic plane.

  3. Iris flower data set - Wikipedia

    en.wikipedia.org/wiki/Iris_flower_data_set

    Scatterplot of the data set. The Iris flower data set or Fisher's Iris data set is a multivariate data set used and made famous by the British statistician and biologist Ronald Fisher in his 1936 paper The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis. [1]

  4. Algebra of random variables - Wikipedia

    en.wikipedia.org/wiki/Algebra_of_random_variables

    This means that random variables form complex commutative *-algebras. If X = X * then the random variable X is called "real". An expectation E on an algebra A of random variables is a normalized, positive linear functional. What this means is that E[k] = k where k is a constant; E[X * X] ≥ 0 for all random variables X;

  5. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    Diagram showing the cumulative distribution function for the normal distribution with mean (μ) 0 and variance (σ 2) 1. These numerical values "68%, 95%, 99.7%" come from the cumulative distribution function of the normal distribution.

  6. List of exoplanets and planetary debris around white dwarfs

    en.wikipedia.org/wiki/List_of_exoplanets_and...

    similar to solar system giant planets in age and separation [22] WD 2105−82 (LAWD 83) metal-polluted single candidate 1–2 34.62 direct imaging 2024 similar to solar system giant planets in age and separation [22] GALEX J071816.4+373139: massive single candidate 3.6 infrared excess 2024 planet candidate has a temperature of about 400 K [23]

  7. HP Lyrae - Wikipedia

    en.wikipedia.org/wiki/HP_Lyrae

    It also revealed that the abundances were altered by dust-gas separation in circumstellar material. [5] HP Lyr has been included in a catalog of confirmed post-AGB stars, highly evolved and on its way to becoming a white dwarf. [13] In 2017, the temperature was calculated to be 5,900 K, still one of the hottest known RV Tau variables. [7]

  8. Liquid–liquid extraction - Wikipedia

    en.wikipedia.org/wiki/Liquid–liquid_extraction

    The separation factor is one distribution ratio divided by another; it is a measure of the ability of the system to separate two solutes. For instance, if the distribution ratio for nickel (D Ni) is 10 and the distribution ratio for silver (D Ag) is 100, then the silver/nickel separation factor (SF Ag/Ni) is equal to D Ag /D Ni = SF Ag/Ni = 10.

  9. SV Centauri - Wikipedia

    en.wikipedia.org/wiki/SV_Centauri

    SV Centauri is a variable star in the constellation Centaurus.An eclipsing binary, its visual apparent magnitude has a maximum of 8.71, fading to 9.98 during primary eclipse and 9.42 during secondary eclipse. [3]