* Astronomy

A partial solar eclipse occurred on April 13, 1801. The eclipse was visible in Russia, Northern Europe and Greenland. Read more

Orbital elements: 2013 GY68 Earth MOID = 0.1783 AU Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC M 351.11022 (2000.0) P Q n 0.24978964 Peri. 110.36874 -0.37683810 +0.91981449 a 2.4970071 Node 136.98187 -0.89832254 -0.33415702 e 0.5544742 Incl. 9.21435 -0.22585317 -0.20562194 P 3.95 H 20.9...

Orbital elements: 2013 GX68 Earth MOID = 0.2243 AU Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC M 64.86198 (2000.0) P Q n 0.70819026 Peri. 111.86444 -0.72055401 -0.68747535 a 1.2465300 Node 24.99204 +0.53048503 -0.63054479 e 0.0355603 Incl. 12.36069 +0.44652833 -0.36026505 P 1.39 H 23.0 G...

Orbital elements: 2013 GV68 Earth MOID = 0.0511 AU Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC M 28.22295 (2000.0) P Q n 0.41866766 Peri. 256.23939 +0.40857699 -0.91251963 a 1.7696598 Node 169.58210 +0.87323712 +0.38465879 e 0.8769865 Incl. 6.12929 +0.26555938 +0.13908825 P 2.35 H 18.9 G...

Orbital elements: 2013 GU68 Earth MOID = 0.1788 AU Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC M 127.14335 (2000.0) P Q n 0.48584863 Peri. 25.78759 +0.58561744 -0.78641488 a 1.6025148 Node 29.60911 +0.65774949 +0.31936801 e 0.2811047 Incl. 23.43232 +0.47372758 +0.52873028 P 2.03 H 19.3 G...

The thin crescent moon captured with a 100mm refractor and Vesta pro webcam. Music via an Amiga 1200

Title: Greatly Enhanced Eccentricity Oscillations in Quadruple Systems Composed of Two Binaries: Implications for Stars, Planets, and Transients Authors: Ondrej Pejcha, Joe M. Antognini, Benjamin J. Shappee, Todd A. Thompson We study the orbital evolution of hierarchical quadruple system...

The Southern Astrophysical Research Telescope (SOAR) is a modern 4.1-meter-aperture optical and near-infrared telescope located on Cerro Pachón, Chile at 2,738 meters elevation. It was commissioned in 2003, and is operated by a consortium including the countries of Brazil and Chile, Michiga...

Title: The Black Hole Remnant of Black Hole-Neutron Star Coalescing Binaries Authors: Francesco Pannarale We present a model for determining the dimensionless spin parameter and mass of the black hole remnant of black hole-neutron star mergers with parallel orbital angular momentum and initi...

What do you call someone who can see billions of years into our cosmic past? An astronomer, of course! By combining the super sensitive eyes of NASA's Spitzer Space Telescope, Hubble Space Telescope, and Chandra X-ray Observatory, astronomers on the Great Observatories Origins Deep Survey (...

Orbital elements: 2011 GF Earth MOID = 0.0808 AU Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC M 315.37489 (2000.0) P Q n 0.49506817 Peri. 202.05997 -0.69662855 +0.67146837 a 1.5825571 Node 26.12738 -0.54212073 -0.26200427 e 0.3262453 Incl. 35.01250 -0.46990826 -0.69316953 P 1.99 H 21.1 G 0....

Orbital elements: 2013 GR66 Earth MOID = 0.2239 AU Epoch 2013 Apr. 18.0 TT = JDT 2456400.5 MPC M 353.91893 (2000.0) P Q n 0.22846833 Peri. 205.45982 -0.56120507 +0.80405036 a 2.6500376 Node 31.53198 -0.68060263 -0.31331569 e 0.5457262 Incl. 22.05161 -0.47098719 -0.50530812 P 4.31 H 21.1...

Asteroid (204) Kallisto is at Opposition in the constellation Virgo on the 13th April. Magnitude: 11.5 Distance to Earth: 1.364 au Distance to Sun center: 2.367 au

Title: Radially Extended Kinematics in the S0 Galaxy NGC 2768 from Planetary Nebulae, Globular Clusters and Starlight Authors: Duncan A. Forbes, Arianna Cortesi, Vincenzo Pota, Caroline Foster, Aaron J. Romanowsky, Michael R. Merrifield, Jean P. Brodie, Jay Strader, Lodovico Coccato, Nicol...

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