Realization of a Two-Synodic-Period Earth-Mars Cycler

2016 ◽  
Author(s):  
Marc Naeije ◽  
Erwin Mooij
Keyword(s):  
Synodic Period

The Planets in Aboriginal Australia

2019 ◽  
Author(s):  
Duane W. Hamacher ◽  
Kirsten Banks
Keyword(s):  
Torres Strait Islander ◽  
Aboriginal People ◽  
Indigenous Australians ◽  
The Sun ◽  
Zodiacal Light ◽  
Retrograde Motion ◽  
Synodic Period ◽  
Relative Brightness ◽  
Torres Strait ◽  
Evening Star

Studies in Australian Indigenous astronomical knowledge reveal few accounts of the visible planets in the sky. However, what information we do have tells us that Aboriginal people are close observers of planets and their motions and properties. Indigenous Australians discerned between planets and stars by their placement in the sky and their general lack of scintillation. Traditions generally describe the ecliptic and zodiac as a pathway of sky ancestors represented by the sun, moon, and planets. This included observing the occasional backwards motion of sky ancestors as they communicate with each other during their journey across the sky, representing an explanation of retrograde motion. Aboriginal and Torres Strait Islander people note the relative brightness of the planets over time and information about the roles they play in their traditions around Australia. Knowledge systems outline the importance placed on Venus as the morning and evening star, making connections to the object as it transitions form one to the other through observations and calculation of the planet’s synodic period. Traditions note the relative positions of the planets to the moon, sun, and background stars, as well as inter planetary dust through zodiacal light, which is perceived as a celestial rope connecting Venus to the sun. The relative dearth of descriptions of planets in Aboriginal traditions may be due to the gross incompleteness of recorded astronomical traditions and of ethnographic bias and misidentification in the anthropological record. Ethnographic fieldwork with Aboriginal and Torres Strait Islander communities is revealing new, previously unrecorded knowledge about the planets and their related phenomena.

scholarly journals Precision of Ephemerides for Space Missions

1971 ◽  
Vol 12 ◽  
pp. 639-642 ◽  
Author(s):  
B.G. Marsden
Keyword(s):  
Space Missions ◽  
Crimean Astrophysical Observatory ◽  
Minor Planet ◽  
Minor Planets ◽  
Synodic Period

One of the most extensive programs of systematic observations of minor planets currently being conducted is that at the Crimean Astrophysical Observatory. The observed positions, together with the residuals from the predictions in the annual Ephemeris volumes, have been listed in the Minor Planet Circulars for several years now; and inspection of the residuals yields information about the accuracy of minor planet ephemerides as a whole.The observations are made using a 40 cmf/4 double astrograph, the limiting magnitude being about 18. Between June 1968 and October 1969, corresponding to one synodic period of an average minor planet, about 40 percent of all the numbered objects were observed. These observations may be regarded as reasonably representative of all the planets. Observations were made of 60 of the objects with numbers in the 100’s and only 29 of those in the 1100’s, but in general the distribution was surprisingly uniform.

The Sun, Moon and Venus at Uxmal

1980 ◽  
Vol 45 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Weldon Lamb
Keyword(s):  
The Sun ◽  
Synodic Period ◽  
Maya Site ◽  
East West

Counts of mosaic facade elements, doors, steps, and colonnettes of the East, West, and North Buildings of the Nunnery Quadrangle at the Maya site of Uxmal suggest that these features, taken together, preserve knowledge of eight facts about the sun, moon, and Venus: the moon's synodic period is 29.53 + days; the lunar sidereal period lasts nearly 27.33 days; the Venus synodic mean is almost 584 days; the observed Venus synodic can vary between 581 and 587 days; any five consecutive Venus synodics equal or come to within one day of eight vague years of 365 days each; one sun-moon correlation has five short years and three long ones together equal to eight vague years or eight true solar years or 99 lunations; the Venus sidereal period is nearly 224 days long; and, finally, 13 Venus sidereals virtually equal five Venus synodics. Cheek glyphs, flanking birdserpents, and plumed-snake headbands all suggest that most of the masks on the East Building, West Building, and Governor's Palace represent not Chac but Kukulcan-Venus. It is therefore suggested that at least some Pure Florescent facades contain astronomical, calendrical, and ritual information, not just attractively arranged mosaic stones, and that other features, such as doors, steps, and colonnettes, should also be considered as potentially informative.

Nova Cygni 1975 (V1500 Cyg) in 2000–2009 and the nature of its synodic period

Astrophysics ◽  
2011 ◽  
Vol 54 (1) ◽  
pp. 36-51 ◽  
Author(s):  
A. A. Litvinchova ◽  
E. P. Pavlenko ◽  
S. Yu. Shugarov
Keyword(s):  
Synodic Period

Notable Two-Synodic-Period Earth-Mars Cycler

2006 ◽  
Vol 43 (2) ◽  
pp. 456-465 ◽  
Author(s):  
T. Troy McConaghy ◽  
Damon F. Landau ◽  
Chit Hong Yam ◽  
James M. Longuski
Keyword(s):  
Synodic Period

Synodic period: A relative angular velocity approach

1985 ◽  
Vol 23 (3) ◽  
pp. 164-164
Author(s):  
Boris Kuharetz
Keyword(s):  
Angular Velocity ◽  
Synodic Period

scholarly journals The physical and dynamical characteristics of the asteroid 4940 Polenov

2021 ◽  
pp. 39-49
Author(s):  
E. Vchkova-Bebekovska ◽  
N. Todorovic ◽  
A. Kostov ◽  
Z. Donchev ◽  
G. Borisov ◽  
...  
Keyword(s):  
Outer Part ◽  
Astronomical Observatory ◽  
Inversion Method ◽  
Main Belt ◽  
Dynamical Characteristics ◽  
Photometric Observations ◽  
Synodic Period ◽  
Solar System Object ◽  
Stability Time ◽  
Astronomical Station

The asteroid (1986 QY4) 4940 Polenov is the first Solar system object whose 3D shape is determined using the observations from the newly built Astronomical Station Vidojevica (ASV). Here we present the results of photometric observations for Polenov, gathered from the ASV, and from the Bulgarian National Astronomical Observatory (BNAO) Rozhen, during 2014, 2019 and 2020 apparitions. Polenov is a 17.8km object located in the outer part of the main belt and belongs to the asteroid family Themis. We have determined the lightcurves, the synodic period of 4.161?0.001 h, as well as the solution for the shape and spin axis. Using the lightcurve inversion method, the combination of our lightcurves and the sparse data from ATLAS{HKO and ATLAS-MLO, we also found the sidereal period, indicating a retrograde rotation of the asteroid, with two possible mirrored pole solutions. The ratio of the largest to smallest reecting surface is about 1.4. In addition, we studied the dynamical properties of the asteroid and obtained a long stability time that exceeds 0.4 Gyrs.

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