99942 Apophis (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "99942 Apophis" in English language version.

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44nasa.gov

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aero.org

Binzel, R. P. (2007). "Can NEAs be Grouped by Their Common Physical Characteristics?" (PDF). Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology. aero.org. Archived from the original (PDF) on April 12, 2012.
Range of Possible Impact Points on April 13, 2036 in Scenarios for Dealing with Apophis, by Donald B. Gennery, presented at the Planetary Defense Conference. Washington, DC. March 5–8, 2007 (archived from the original on 2012-04-12).
"Scenarios for Dealing with Apophis" (PDF). The Aerospace Corporation. Archived from the original (PDF) on August 27, 2008. Retrieved July 18, 2008.

afp.google.com

"German schoolboy, 13, corrects NASA's asteroid figures". Archived from the original on April 20, 2008. Retrieved April 16, 2008.

ancientegyptonline.co.uk

Hill, J. (2010). "Apep (Apophis)". Ancient Egypt Online. Retrieved July 24, 2021.

archive.today

Cooke, B. (August 18, 2005). "Asteroid Apophis set for a makeover". Astronomy Magazine. Archived from the original on May 29, 2012. Retrieved October 8, 2009.

arizona.edu

news.arizona.edu

Mace Kelley, Mikayla (April 25, 2022). "NASA gives green light for OSIRIS-REx spacecraft to visit another asteroid". University of Arizona News. Retrieved April 26, 2022.

arxiv.org

Farnocchia, D.; Chesley, S. R.; Chodas, P. W.; Micheli, M. (February 20, 2013). "Yarkovsky-driven impact risk analysis for asteroid (99942) Apophis". Icarus. 224 (1): 192. arXiv:1301.1607. Bibcode:2013Icar..224..192F. doi:10.1016/j.icarus.2013.02.020. S2CID 119088923.
Reddy, V.; Sanchez, J. A.; Furfaro, R.; Binzel, R. P.; et al. (March 5, 2018). "Surface Composition of (99942) Apophis". The Astronomical Journal. 155 (3). American Astronomical Society: 140. arXiv:1803.05375. Bibcode:2018AJ....155..140R. doi:10.3847/1538-3881/aaaa1c. ISSN 1538-3881. S2CID 78087061.
Satpathy, Akash; Mainzer, Amy; Masiero, Joseph R.; Linder, Tyler; et al. (May 31, 2022). "NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis". The Planetary Science Journal. 3 (5): 124. arXiv:2204.05412. Bibcode:2022PSJ.....3..124S. doi:10.3847/PSJ/ac66d1. S2CID 248118987.
Wee, L. K.; Goh, G. H. (December 14, 2012). "A geostationary Earth orbit satellite model using Easy Java Simulation". Physics Education. 48 (1). IOP Publishing: 72–79. arXiv:1212.3863. doi:10.1088/0031-9120/48/1/72. ISSN 0031-9120. S2CID 119208827.
Morelli, Andrea C.; Mannocchi, Alessandra; et al. (September 2023). "Initial Trajectory Assessment of the RAMSES Mission to (99942) Apophis". arXiv:2309.00435 [astro-ph.EP].

asteroidoccultation.com

"Lifetime Achievement Award of the International Occultation Timing Association". asteroidoccultation.com. International Occultation Timing Association. 2021. Retrieved November 27, 2021.
"Asteroidal Occultation Reviewed Results for North America – 2021 Asteroidal Occultation Preliminary Results". asteroidoccultation.com. March 8, 2021. Archived from the original on March 14, 2021. Retrieved March 12, 2021.

astronomy.com

Cooke, B. (August 18, 2005). "Asteroid Apophis set for a makeover". Astronomy Magazine. Archived from the original on May 29, 2012. Retrieved October 8, 2009.
"Hawaii astronomers keep tabs on asteroid Apophis". Astronomy Magazine. March 10, 2011. Retrieved March 10, 2011.

astronomy.cz

sajri.astronomy.cz

Pravec, P.; Scheirich, P.; Ďurech, J.; Pollock, J.; et al. (2014). "The tumbling spin state of (99942) Apophis" (PDF). Icarus. 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Archived from the original (PDF) on March 5, 2016. Retrieved November 26, 2014.

b612foundation.org

Schweickart, R. "Threat Characterization: Trajectory dynamics (White Paper 39)" (PDF). Figure 4, pp. 9. B612 Foundation. Archived from the original (PDF) on February 28, 2008. Retrieved February 22, 2008.

bbc.co.uk

news.bbc.co.uk

Rincon, P. (February 26, 2008). "US team wins asteroid competition". Retrieved March 25, 2009.

bild.de

Sauerbier, M. (April 4, 2008). "Ich habe den Weltuntergang ausgerechnet!" [I have calculated the apocalypse]. Bild (in German). Archived from the original on August 9, 2018. Retrieved March 14, 2021.

cbc.ca

"NASA refutes story of boy who predicted asteroid collision". CBC/Radio-Canada. April 16, 2008. Retrieved November 8, 2015.

dlr.de

earn.dlr.de

"99942 Apophis". The Near-Earth Asteroids Data Base at E.A.R.N. Archived from the original on June 16, 2012. Retrieved October 15, 2009.

doi.org

Farnocchia, D.; Chesley, S. R.; Chodas, P. W.; Micheli, M. (February 20, 2013). "Yarkovsky-driven impact risk analysis for asteroid (99942) Apophis". Icarus. 224 (1): 192. arXiv:1301.1607. Bibcode:2013Icar..224..192F. doi:10.1016/j.icarus.2013.02.020. S2CID 119088923.
Brozović, M.; Benner, L. A. M.; McMichael, J. G.; Giorgini, J. D.; et al. (January 15, 2018). "Goldstone and Arecibo radar observations of (99942) Apophis in 2012–2013" (PDF). Icarus. 300: 115–128. Bibcode:2018Icar..300..115B. doi:10.1016/j.icarus.2017.08.032. Retrieved August 19, 2018.
Reddy, Vishnu; Kelley, Michael S.; Dotson, Jessie; Farnocchia, Davide; et al. (May 31, 2022). "Apophis Planetary Defense Campaign". The Planetary Science Journal. 3 (5): 123. Bibcode:2022PSJ.....3..123R. doi:10.3847/PSJ/ac66eb. S2CID 249227833.
Pravec, P.; Scheirich, P.; Ďurech, J.; Pollock, J.; et al. (2014). "The tumbling spin state of (99942) Apophis" (PDF). Icarus. 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Archived from the original (PDF) on March 5, 2016. Retrieved November 26, 2014.
Jon Giorgini; et al. (October 4, 2007). "Predicting the Earth encounters of (99942) Apophis" (PDF). Icarus. 193: 1–19. doi:10.1016/j.icarus.2007.09.012. Archived from the original (PDF) on December 22, 2016.
Reddy, V.; Sanchez, J. A.; Furfaro, R.; Binzel, R. P.; et al. (March 5, 2018). "Surface Composition of (99942) Apophis". The Astronomical Journal. 155 (3). American Astronomical Society: 140. arXiv:1803.05375. Bibcode:2018AJ....155..140R. doi:10.3847/1538-3881/aaaa1c. ISSN 1538-3881. S2CID 78087061.
Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved August 24, 2018.
Satpathy, Akash; Mainzer, Amy; Masiero, Joseph R.; Linder, Tyler; et al. (May 31, 2022). "NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis". The Planetary Science Journal. 3 (5): 124. arXiv:2204.05412. Bibcode:2022PSJ.....3..124S. doi:10.3847/PSJ/ac66d1. S2CID 248118987.
Bamberger, D.; Wells, G. (September 2018). "Detection of the Yarkovsky Effect on 1998 SD9 from Optical Observations". Research Notes of the AAS. 2 (3): 164. Bibcode:2018RNAAS...2..164B. doi:10.3847/2515-5172/aadf80. S2CID 125805680.
Wee, L. K.; Goh, G. H. (December 14, 2012). "A geostationary Earth orbit satellite model using Easy Java Simulation". Physics Education. 48 (1). IOP Publishing: 72–79. arXiv:1212.3863. doi:10.1088/0031-9120/48/1/72. ISSN 0031-9120. S2CID 119208827.
Baileya, N. J. (2006). "Near Earth Object impact simulation tool for supporting the NEO mitigation decision making process". Near Earth Objects. 236: 477. Bibcode:2007IAUS..236..477B. doi:10.1017/S1743921307003614.
Izzo, D.; Bourdoux, A.; Walker, R.; Ongaro, F. (2006). "Optimal Trajectories for the Impulsive Deflection of NEOs" (PDF). Acta Astronautica. 59 (1–5): 294–300. Bibcode:2006AcAau..59..294I. doi:10.1016/j.actaastro.2006.02.002.

earthsky.org

Byrd, D. (April 30, 2019). "Preparing for asteroid Apophis | EarthSky.org". earthsky.org. Retrieved May 1, 2019.

esa.int

ESA (January 9, 2013). "Herschel intercepts asteroid Apophis". European Space Agency (ESA). Retrieved January 9, 2013.
"Don Quijote concept". esa.int. European Space Agency. April 4, 2006. Archived from the original on September 4, 2006.
Izzo, D.; Bourdoux, A.; Walker, R.; Ongaro, F. (2006). "Optimal Trajectories for the Impulsive Deflection of NEOs" (PDF). Acta Astronautica. 59 (1–5): 294–300. Bibcode:2006AcAau..59..294I. doi:10.1016/j.actaastro.2006.02.002.

cosmos.esa.int

"Apophis' Yarkovsky acceleration improved through stellar occultation". Gaia Image of the Week. European Space Agency (ESA). March 29, 2021. Retrieved November 27, 2021.

eso.org

"Neptune from the VLT with and without adaptive optics". ESO. July 18, 2018. Retrieved October 17, 2022.

euronews.com

Hurst, Luke (March 28, 2021). "Asteroid Apophis won't hit Earth for at least 100 years, says NASA". euronews. Retrieved April 2, 2021.

foxnews.com

Khoury, A. (February 15, 2016). "Russia wants to target near-Earth objects with its ICBMs". TASS in foxnews.com. Retrieved February 15, 2016.

fr.de

Banner, T. (March 4, 2021). ""Apophis": Gefährlicher Asteroid nähert sich der Erde – Letzte Chance für Forschende" ["Apophis": Hazardous asteroid approaches Earth – last chance for scientists]. Frankfurter Rundschau (in German). Retrieved March 4, 2021.

gamespot.com

Winegarner, T. (November 6, 2019). "Rage Interview: We speak with id's Tim Willits about their new IP, Rage". Gamespot.

harvard.edu

ui.adsabs.harvard.edu

Farnocchia, D.; Chesley, S. R.; Chodas, P. W.; Micheli, M. (February 20, 2013). "Yarkovsky-driven impact risk analysis for asteroid (99942) Apophis". Icarus. 224 (1): 192. arXiv:1301.1607. Bibcode:2013Icar..224..192F. doi:10.1016/j.icarus.2013.02.020. S2CID 119088923.
Brozović, M.; Benner, L. A. M.; McMichael, J. G.; Giorgini, J. D.; et al. (January 15, 2018). "Goldstone and Arecibo radar observations of (99942) Apophis in 2012–2013" (PDF). Icarus. 300: 115–128. Bibcode:2018Icar..300..115B. doi:10.1016/j.icarus.2017.08.032. Retrieved August 19, 2018.
Reddy, Vishnu; Kelley, Michael S.; Dotson, Jessie; Farnocchia, Davide; et al. (May 31, 2022). "Apophis Planetary Defense Campaign". The Planetary Science Journal. 3 (5): 123. Bibcode:2022PSJ.....3..123R. doi:10.3847/PSJ/ac66eb. S2CID 249227833.
Pravec, P.; Scheirich, P.; Ďurech, J.; Pollock, J.; et al. (2014). "The tumbling spin state of (99942) Apophis" (PDF). Icarus. 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Archived from the original (PDF) on March 5, 2016. Retrieved November 26, 2014.
Reddy, V.; Sanchez, J. A.; Furfaro, R.; Binzel, R. P.; et al. (March 5, 2018). "Surface Composition of (99942) Apophis". The Astronomical Journal. 155 (3). American Astronomical Society: 140. arXiv:1803.05375. Bibcode:2018AJ....155..140R. doi:10.3847/1538-3881/aaaa1c. ISSN 1538-3881. S2CID 78087061.
Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved August 24, 2018.
Tholen, D.; Farnocchia, D. (October 2020). "Detection of Yarkovsky Acceleration of (99942) Apophis". Bulletin of the American Astronomical Society. 52 (6): 214.06. Bibcode:2020DPS....5221406T.
Satpathy, Akash; Mainzer, Amy; Masiero, Joseph R.; Linder, Tyler; et al. (May 31, 2022). "NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis". The Planetary Science Journal. 3 (5): 124. arXiv:2204.05412. Bibcode:2022PSJ.....3..124S. doi:10.3847/PSJ/ac66d1. S2CID 248118987.
Bamberger, D.; Wells, G. (September 2018). "Detection of the Yarkovsky Effect on 1998 SD9 from Optical Observations". Research Notes of the AAS. 2 (3): 164. Bibcode:2018RNAAS...2..164B. doi:10.3847/2515-5172/aadf80. S2CID 125805680.
Baileya, N. J. (2006). "Near Earth Object impact simulation tool for supporting the NEO mitigation decision making process". Near Earth Objects. 236: 477. Bibcode:2007IAUS..236..477B. doi:10.1017/S1743921307003614.
Izzo, D.; Bourdoux, A.; Walker, R.; Ongaro, F. (2006). "Optimal Trajectories for the Impulsive Deflection of NEOs" (PDF). Acta Astronautica. 59 (1–5): 294–300. Bibcode:2006AcAau..59..294I. doi:10.1016/j.actaastro.2006.02.002.

icq.eps.harvard.edu

"The astronomical magnitude scale". International Comet Quarterly. Retrieved January 19, 2021.

adsabs.harvard.edu

Marchis, F.; et al. "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus. 221 (2): 1130–1161. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved August 24, 2018.

iawn.net

"99942 Apophis 2021 – Gallery". IAWN. March 19, 2021. Retrieved June 1, 2022.

ic.ac.uk

impact.ese.ic.ac.uk

Marcus, R.; Melosh, H. J.; Collins, G. (2010). "Earth Impact Effects Program". Imperial College London / Purdue University. Retrieved March 14, 2021. (solution using 370 metres, 3000 kg/m³, 12.6 km/s, 45 degrees)

iota-es.de

"Chasing the Shadow of (99942) Apophis" (PDF). Journal of Occultation Astronomy. 11 (3): 1–2, 24–29. 2021. Retrieved November 27, 2021.

minorplanetcenter.net

"MPEC 2004-Y70 : 2004 MN4". IAU Minor Planet Center. December 27, 2004.
"(99942) Apophis Orbit". IAU Minor Planet Center. Retrieved April 1, 2021.

mpainesyd.com

Paine, M. P. (January 1999). "The Threat is Out There" (PDF). Science of Tsunami Hazards. 17 (3): 155. Archived (PDF) from the original on June 6, 2015. Retrieved March 14, 2021.

naic.edu

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nasa.gov

ssd.jpl.nasa.gov

"JPL Small-Body Database Browser: 99942 Apophis (2004 MN4)" (last observation: 2021-05-12; arc: 17.16 years; JPL #216 solution date: 2021-Jun-29). Retrieved November 27, 2021.
"Horizons Batch for Apophis @ 2029-Apr-13 21:46 showing 3-sigma uncertainty of ±3.4km". JPL Horizons. Archived from the original on January 31, 2022. Retrieved September 3, 2021.
"Horizons Batch for Apophis @ 2036-Mar-27 08:30 showing 3-sigma uncertainty of ±129145km". JPL Horizons. Archived from the original on July 10, 2023. Retrieved July 10, 2023.
"Horizons Batch for Apophis @ 2116-Apr-12 17:50 showing 3-sigma uncertainty of ±13 million km". JPL Horizons. Retrieved July 31, 2022.
"Horizons Batch for Apophis @ 2117-Oct-07 16:24 showing 3-sigma uncertainty of ±37 million km". JPL Horizons. Retrieved September 30, 2023.
2029-Apr-13 approach: 0.000254093 AU (38,011.8 km). 38012km "geocentric distance" – 6378km "Earth radius" = 31634km
"Horizons Batch for Apophis Orbital Elements for 2029-01-01 and 2030-01-01". JPL Horizons. Retrieved July 31, 2022.
"Venus 2036-May-30 @ JPL Horizons".
"Horizons Batch for Apophis on 2068-Apr-12". JPL Horizons. Retrieved July 31, 2022.
"JPL Small-Body Database Browser: 99942 Apophis (2004 MN4)" (last observation: 2021-03-08; arc: 16.98 years; JPL #206 solution date: 2021-Mar-09). March 9, 2021. Archived from the original on March 11, 2021. Retrieved March 11, 2021.
"JPL Small-Body Database Browser". November 6, 2020. Archived from the original on November 6, 2020.

neo.jpl.nasa.gov

"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL Center for NEO Studies. May 6, 2013. Archived from the original on May 11, 2013. See also updated version at "Sentry: Earth Impact Monitoring, Object Details". NASA/JPL Center for NEO Studies. Archived from the original on February 8, 2021. Retrieved February 8, 2021.
Jon Giorgini; et al. (October 4, 2007). "Predicting the Earth encounters of (99942) Apophis" (PDF). Icarus. 193: 1–19. doi:10.1016/j.icarus.2007.09.012. Archived from the original (PDF) on December 22, 2016.
Giorgini, J. (October 2007). "Predicting Apophis' Earth Encounters in 2029 and 2036". Archived from the original on January 15, 2016.
"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL. August 5, 2006. Archived from the original on August 5, 2006. Retrieved January 13, 2013.
"2004 MN4 Earth Impact Risk Summary". NASA/JPL. February 5, 2005. Archived from the original on February 6, 2005. Retrieved January 13, 2013.
"99942 Apophis Earth Impact Risk Summary". NASA JPL. October 18, 2005. Archived from the original on October 18, 2005. Retrieved January 13, 2013.
"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL. July 1, 2006. Archived from the original on July 1, 2006. Retrieved January 13, 2013.
"99942 Apophis (2004 MN4)". neo.jpl.nasa.gov. Archived from the original on March 2, 2017. Retrieved August 9, 2017.
Giorgini, J. "Apophis Trajectory Change 2018–2036: Energy Reflection, Absorption, and Emission". NASA. Archived from the original on November 9, 2007.
"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL. May 6, 2013. Archived from the original on January 10, 2013. Retrieved March 13, 2021.
"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL. October 8, 2014. Archived from the original on March 23, 2016.

cneos.jpl.nasa.gov

"99942 Apophis (2004 MN4) Earth Impact Risk Summary". NASA/JPL Center for NEO Studies. May 6, 2013. Archived from the original on May 11, 2013. See also updated version at "Sentry: Earth Impact Monitoring, Object Details". NASA/JPL Center for NEO Studies. Archived from the original on February 8, 2021. Retrieved February 8, 2021.
Yeomans, D.; Chesley, S.; Chodas, P. (December 23, 2004). "Near-Earth Asteroid 2004 MN4 Reaches Highest Score To Date On Hazard Scale". NASA/JPL CNEOS. Retrieved January 31, 2024. Today's impact monitoring results indicate that the impact probability for April 13, 2029, has risen to about 1.6%, which for an object of this size corresponds to a rating of 4 on the ten-point Torino Scale.
"Sentry: Earth Impact Monitoring". NASA/JPL Center for NEO Studies. Archived from the original on March 24, 2021. Retrieved March 3, 2021. (Use Unconstrained Settings to reveal 1979 XB with impact probability below 1e-6)
Yeomans, D.; Chodas, P.; Chesley, S. (December 27, 2004). "Possibility of an Earth Impact in 2029 Ruled Out for Asteroid 2004 MN4". NASA/JPL CNEOS. Retrieved January 31, 2024.
Chodas, P.; Chesley, S.; Giorgini, J.; Yeomans, D. (February 3, 2005). "Radar Observations Refine the Future Motion of Asteroid 2004 MN4". NASA's Near Earth Object Program Office. Retrieved January 31, 2024.
Brown, D. (October 7, 2009). "NASA Refines Asteroid Apophis' Path Toward Earth". NASA's Near Earth Object Program Office. Retrieved January 31, 2024.
"Apophis Risk Assessment Updated". cneos.jpl.nasa.gov. February 21, 2013. Archived from the original on April 8, 2019.
"Update notes: Apophis (Mar 2015)". Sentry: Earth Impact Monitoring, Operational Notes. NASA/JPL Center for NEO Studies. March 2, 2015. Archived from the original on April 14, 2017. Retrieved May 8, 2019.
Removed Objects from Sentry Risk Table

echo.jpl.nasa.gov

Brozović, M.; Benner, L. A. M.; McMichael, J. G.; Giorgini, J. D.; et al. (January 15, 2018). "Goldstone and Arecibo radar observations of (99942) Apophis in 2012–2013" (PDF). Icarus. 300: 115–128. Bibcode:2018Icar..300..115B. doi:10.1016/j.icarus.2017.08.032. Retrieved August 19, 2018.
"Goldstone Radar Observations Planning: 99942 Apophis in 2021". Jet Propulsion Laboratory. March 9, 2021. Retrieved March 19, 2021.
Benner, L. A. M. (January 9, 2013). "99942 Apophis 2013 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved January 9, 2013.

jpl.nasa.gov

"NASA Rules Out Earth Impact in 2036 for Asteroid Apophis". NASA. January 10, 2013. Retrieved January 10, 2013.
"NASA Analysis: Earth Is Safe From Asteroid Apophis for 100-Plus Years". Jet Propulsion Laboratory. March 25, 2021.
Brown, D.; Wendel, J.; Agle, D. C. (April 29, 2019). "Scientists Planning Now for Asteroid Flyby a Decade Away". NASA. Retrieved April 29, 2019.

nasa.gov

Tony Greicius, ed. (May 31, 2022). "Planetary Defense Exercise Uses Apophis as Hazardous Asteroid Stand-In". NASA. Retrieved June 1, 2022.
Brown, D. (April 16, 2008). "NASA Statement on Student Asteroid Calculations". NASA. Retrieved April 28, 2008.
Brown, D. (October 7, 2009). "NASA Refines Asteroid Apophis' Path Toward Earth". Archived from the original on October 9, 2009. Retrieved October 7, 2009.

blogs.nasa.gov

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nai.arc.nasa.gov

Morrison, D. (July 22, 2005). "Schweickart Proposes Study of Impact Risk from Apophis (MN4)". NASA. Archived from the original on September 29, 2009. Retrieved October 8, 2009.

science.nasa.gov

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ehpd.gsfc.nasa.gov

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oca.eu

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Tanga, P. (March 10, 2021). "Targeted Campaigns – Apophis 2021". Archived from the original on March 12, 2021. Retrieved March 12, 2021.

popularmechanics.com

David Noland (November 7, 2006). "5 Plans to Head Off the Apophis Killer Asteroid". Popular Mechanics. Archived from the original on June 12, 2018. Retrieved March 14, 2021.

satsig.net

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