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Movements, leaders, victories and the continuing fight for equality.
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Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
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In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
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| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 14h 09m 54.81424s[2] |
| Declination | −53° 26′ 20.2049″[2] |
| Apparent magnitude (V) | 4.74[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | G9-III[3] |
| B−V color index | +0.938±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −17.12±0.12[2] km/s |
| Proper motion (μ) | RA: −145.136[2] mas/yr Dec.: −91.064[2] mas/yr |
| Parallax (π) | 18.2253±0.1091 mas[2] |
| Distance | 179 ± 1 ly (54.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.00[1] |
| Details | |
| Mass | 2.50+0.11 −0.06[2] M☉ |
| Radius | 8.58+0.08 −0.17[2] R☉ |
| Luminosity | 40.1±0.5[2] L☉ |
| Surface gravity (log g) | 3.13±0.08[4] cgs |
| Temperature | 5,089±31[4] K |
| Metallicity [Fe/H] | +0.07±0.03[4] dex |
| Age | 621[2] Myr |
| Other designations | |
| CPD−52°7028, HD 123569, HIP 69191, HR 5297, SAO 241496, WDS J14099-5326A[5] | |
| Database references | |
| SIMBAD | data |
HD 123569 is a single[6] star in the southern constellation of Centaurus, positioned near the eastern constellation border with Lupus. This object has a yellowish hue and is visible to the naked eye with an apparent visual magnitude of 4.74.[1] It is located at a distance of approximately 179 light years from the Sun based on parallax, and it has an absolute magnitude of +1.00.[1] The star is drifting closer with a radial velocity of −17 km/s.[2] O. J. Eggen flagged this star as a member of the Hyades Supercluster.[7]
This is an aging giant star with a stellar classification of G9-III,[3] having exhausted the supply of hydrogen at its core then evolved off the main sequence by cooling and expanding. At present it has around 8.6 times the girth of the Sun, with a slightly higher than solar metallicity – what astronomers term the abundance of elements with a higher atomic number than helium.[4] The star is radiating 41 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,089 K.[2]
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
HD 123569 is a single star in the southern constellation of Centaurus, positioned near the eastern constellation border with Lupus. This object has a yellowish hue and is visible to the naked eye with an apparent visual magnitude of 4.74. It is located at a distance of approximately 179 light years from the Sun based on parallax, and it has an absolute magnitude of +1.00. The star is drifting closer with a radial velocity of −17 km/s. O. J. Eggen flagged this star as a member of the Hyades Supercluster. This is an aging giant star with a stellar classification of G9-III, having exhausted the supply of hydrogen at its core then evolved off the main sequence by cooling and expanding. At present it has around 8.6 times the girth of the Sun, with a slightly higher than solar metallicity – what astronomers term the abundance of elements with a higher atomic number than helium. The star is radiating 41 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,089 K.
This is the list of notable stars in the constellation Centaurus, sorted by decreasing brightness.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →The Greenwood District.
