Dec 1, 2020 · The generic word for a celestial body is ἄστρον “Periapsis” would mean “the point closest to the point closest to the body.” Nonsense. The proper word is “periastron”: “periapse” …

May 6, 2021 · Usually, how is phase=0 defined? It is relative to the line of apses perhaps with phase=0 at periastron? The true anomaly, $\theta$, is the angle between the current location …

I'm looking for a mathematical justification of the longitude of periapsis as it makes no mathematical sense to me as a notion. By definition, it is the sum of the argument of periapsis …

Following on from a previous question about the interesting Hulse Taylor Binary Pulsar. BACKGROUD Weisberg & Taylor, 2004 present a graph showing the change in …

Oct 20, 2023 · The date that I see in Wikipedia is a calculated date based on two and one-half 50.09 year orbits following the periastron epoch of 1894.13 giving a date of 2019.34.

May 19, 2019 · In a Keplerian orbit, yes, the apoastron and the periastron (I’ll stick to these words despite the controversy; see "Periapsis" or "Periastron"?) are 180° apart. However, in the real …

In orbital dynamics, there exist the argument of periastron (symbol ω) as well as the longitude of periastron (symbol π [or ϖ but may lead to confusion) ), which is equal to the argument of …

The argument of periastron, which is already in the database, IS the same thing as the argument of perihelion, minus some nomenclature. I think instead you are looking for the RAAN (Right …

Mar 20, 2022 · For phase folding I need orbital period P and time of periastron passage T. I have determined the period by plotting a Lomb-Scargle periodogram but I'm unable to find a method …

Apr 10, 2025 · S2 also known as S0–2, is a star in the star cluster close to the supermassive black hole Sagittarius A* (Sgr A*), orbiting it with a period of about 16 years. S2 gravitational …