User:Blervis/sandbox
An areostationary orbit, areosynchronous equatorial orbit (AEO), or Mars geostationary orbit is a circular areosynchronous orbit (ASO) approximately 17,032 km (10,583 mi) in altitude above the Mars equator, following the direction of Mars' rotation.
An object in such an orbit has an orbital period equal to Mars's rotational period, and so to ground observers it appears motionless, in a fixed position in the sky. It is the Martian analog of a Geostationary orbit (GEO). The prefix areo- derives from Ares, the ancient Greek god of war and counterpart to the Roman god Mars, with whom the planet was identified.
Although it would allow for uninterrupted communication and observation of the Martian surface, no artificial satellites have been placed in this orbit due to the technical complexity of achieving and maintaining one.[1][2]
Hello I like this edit-a-thon.[3]
Characteristics
The mass of Mars being 6.4171×1023 kg and the sidereal period 88,642 seconds.[4] The synchronous orbit thus has a radius of 20,428 km from the centre of mass of Mars.[5]
w an areostationary orbit can be defined as approximately 20,428 km above the surface of the Mars equator.[6]
Two stable longitudes exist - 17.92°W and 167.83°E. Satellites placed at any other longitude will tend to drift to these stable longitudes over time.[5][7]
Feasibility
Several factors make placing a spacecraft into an areostationary orbit more difficult than a geostationary orbit.
Any satellites in areostationary orbit will suffer from increased orbital station keeping costs.[2][7] because the areostationary orbits lie between the orbits of the planet's two natural satellites. Phobos has a semi-major axis of 9,376 km, and Deimos has a semi-major axis of 23,463 km. The close proximity to Phobos' orbit in particular (the larger of the two moons) will cause unwanted orbital resonance effects that will gradually shift the orbit of areostationary satellites. Mars's gravity is also much less spherical than earth due to uneven volcanism (i.e. Olympus Mons). This creates additional gravitational disturbances not present on earth, further destabilizing the orbit. Solar radiation pressure and sun-based perturbations are also present, as with an earth-based geostationary orbit.
The distance from earth and general complicated nature of the orbit makes it challenging to [8][7]
Uses
Satellites in an areostationary orbit would allow for greater amounts of data to be relayed back from the Martian surface easier than by using current methods. Satellites in the orbit would also be ideal advantageous for monitoring Martian weather and mapping of the Martian surface. [9]
In the early 2000s NASA explored the feasibility of placing communications satellites in an areocentric orbit as a part of the Mars Communication Network. In the concept, an areostationary relay satellite would transmit data from a network of landers and smaller satellites in lower Martian orbits back to earth.[10][11]
See also
References
- ^ Lay, N.; C. Cheetum; H. Mojaradi; J. Neal (15 November 2001). "Developing Low-Power Transceiver Technologies for In Situ Communication Applications" (PDF). IPN Progress Report 42-147. 42 (147): 22. Bibcode:2001IPNPR.147A...1L. Archived from the original (PDF) on 4 March 2016. Retrieved 2012-02-09.
- ^ a b Romero, P.; Pablos, B.; Barderas, G. (2017-07-01). "Analysis of orbit determination from Earth-based tracking for relay satellites in a perturbed areostationary orbit". Acta Astronautica. 136: 434–442. Bibcode:2017AcAau.136..434R. doi:10.1016/j.actaastro.2017.04.002. ISSN 0094-5765.
- ^ Dalesio, Emery. [www.cool.com "Cool Stuff"]. cool.com.
{{cite web}}
: Check|url=
value (help) - ^ Lodders, Katharina; Fegley, Bruce (1998). The Planetary Scientist's Companion. Oxford University Press. p. 190. ISBN 0-19-511694-1.
- ^ a b "Stationkeeping in Mars orbit". www.planetary.org. Retrieved 2017-11-21.
- ^ Wertz, James; Everett, David; Puschell, Jeffery (2018). Space Mission Engineering: The New SMAD. Torrance, California: Microcosm Press. p. 220. ISBN 978-1-881-883-15-9.
- ^ a b c Silva, Juan; Romero, Pilar (October 2013). "Optimal longitudes determination for the station keeping of areostationary satellites". Planetary and Space Science. 87: 14–18. Bibcode:2013P&SS...87...14S. doi:10.1016//j.pss.2012.11.013. ISSN 0032-0633. Retrieved 30 December 2023 – via Elsevier Science Direct.
- ^ Lakdawalla, Emily (27 June 2013). "Stationkeeping in Mars orbit". The Planetary Society. Retrieved 2023-12-31.
- ^ Montabone, Luca; Nicholas, Heavens (15 July 2020), "OBSERVING MARS FROM AREOSTATIONARY ORBIT BENEFITS AND APPLICATIONS" (PDF), Planetary Science and Decadal Survey 2023-2032
- ^ Bhasin, Kul; Hayden, Jeff; Agre, Jonathan; Clare, Loren; Yan, Tsun-Yee (September 2001). Advanced Communication and Networking Technologies for Mars Exploration (PDF). 19th International Communications Satellite Systems Conference. Retrieved 10 January 2024.
{{cite conference}}
: CS1 maint: date and year (link) - ^ Hastrup, R.C.; Bell, D.J.; Cesarone, R.J. (2003). "Mars network for enabling low-cost missions" (PDF). Acta Astronautica. 52: 227–235 – via Elsevier Science Direct.
External links
- Mars Network - Marsats - NASA site devoted to future communications infrastructure for Mars exploration
- Bandwidth available from an areostationary satellite
Wikimedians of Los Angeles
Error: no shortcuts were specified and the |msg= parameter was not set.Wikimedians of Los Angeles is a Wikimedia user group in Los Angeles, California. This group aims to support and encourage Wikimedians in Greater Los Angeles, which encompasses five counties in Southern California: Los Angeles, Orange, Ventura, San Bernardino, and Riverside—but all Wikimedians and Wikimedia enthusiasts in Southern California are welcome to join our group! This is the next step in the evolution of the informal Los Angeles meetups team that has been coordinating edit-a-thons and other events in the Los Angeles area for the past several years. Objectives and activities
Get involved!To be notified of upcoming meetups and events in the Los Angeles area, add your name to our mailing list.
Reports |
The Greater Los Angeles Area |
Events
- We're always working on new events, but no firm plans now - leave a message on the talk page if you'd like to get an event together!
- Full list of past events and meetups in Los Angeles
- West Hollywood Edit-a-Thon. 12-4 pm, West Hollywood Public Library.
- December 30, 2023: WMLA meetup to improve Hancock Park article, December 30 2023 at the West Hollywood Public Library.
- March 31, 2019: Art+Feminism Meetup at the California African American Museum (Exposition Park). Focus: Women artists in CAAM's collection. 1–4pm.
- March 17, 2019: Art+Feminism Meetup at LACMA (Miracle Mile). Focus: Women+Design+Craft. Noon–5pm.
- March 10, 2019: Art+Feminism Meetup at the Hammer Museum (Westwood). Focus: Women+Film+Media. Noon–5pm.
- March 9, 2019: Art+Feminism Meetup at the Vincent Price Art Museum (Monterey Park). Focus: Latinx Women + Non-Binary Artists. Noon–4pm.
- March 3, 2019: Art+Feminism Meetup at the ICA Los Angeles (DTLA). Focus: Women+Comedy. Noon–5pm.
- February 24, 2019: Wikipedia Day LA 2019
- Sept. 30, 2018 7th Annual LA Wiknic
- July 30, 2018 WikiLovesPride meetup at Cuties Coffee with East of Borneo and Dirty Looks
- May 18, 2018 WikiWomen Edit-a-thon at NeueHouse Hollywood, organized by NowThis and Paramount Network's American Woman.
- March 25, 2018 Art+Feminism 2018: Women in Film edit-a-thon and panel discussion at LACMA with East of Borneo, Noon–5pm.
- March 31, 2018 Wikipedia Day LA 2018: LA on Record, 10:00 - 5:00 pm, Ace Hotel, DTLAUser:Blervis/sandbox/Newsletter/2018-11-15/Content
Participants at the 2024 West Hollywood Edit-a-Thon
|}
Participants and supporters
New to Wikipedia?
New to Wikipedia? There are a variety of great resources to help you get started:
- Wikipedia:Introduction, an introduction to the project, editing, and more.
- Wikipedia:A primer for newcomers, an overview of basics, policies, and more.
- Wikipedia:Learning the ropes, learning how to navigate and find resources.
- Wikipedia:Your first article, if you're interested in starting a new article.
- Wikipedia:Teahouse, a great resource for new editors to ask any questions they may have.
- The resources listed below cover the large array of topics for any situation.
Resources
|
|
- Resource list derived from Template:WelcomeMenu