IOTA/IOTA-ES occultation update for (395699) 2012 GN12 / UCAC4 280-210683 event on 2023 Sep 15, 12:44 UT Visible from Summary ------- On 2023 Sep 15 UT, the 23.9 km diameter asteroid (395699) 2012 GN12 will occult a 12.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.57 mag to 23.15 mag (the magnitude of the asteroid) for at most 3.160 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 0 * date and approx. time of event: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2460203.04204620 * magnitude of target star: 12.58 * magnitude drop [mag]: 10.57 * estimated maximum duration [s]: 3.160 * Moon: 0 % sunlit, 108° distance * Sun: 112° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 489.82 * 1 sigma uncertainty interval [seconds]: +/- 940.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 1.136, +/- 0.278) * 1 sigma uncertainty ellipse (major, minor, PA): (1.166", 0.094", 77°) * approx speed of asteroid's shadow [km/s]: 7.5554 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 280-210683 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 11 13.8065 DE: -34 01 24.693 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 11 13.8064 DE: -34 01 24.693 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (395699) 2012 GN12 asteroid class: Centaur approx. diameter [km]: 24 approx. diameter ["]: 0.002 distance from Earth [AU]: 16.14240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#14 date of fit: 2021 Apr 14 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 1.166", 0.094", 77.008° remarks: * orbital elements for (395699)2012 GN12 : Mean anomaly = 84.7193740511 deg Arg. of pericenter = 171.5486322062 deg Long. of node = 350.7949972505 deg Inclination = 12.6000639826 deg Eccentricity = 0.3718662122 Semimajor axis = 15.0763363524 AU Perihelion dist = 9.4699562592 AU Mag: H = 10.75, G = 0.15 Epoch of elements : MJD 60202.53055556 TDT (2023 Sep 15.5306) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#142021Apr14,3.16,2023,9,15,13.009109,2.072272,1.987992,-2.951874,3.077734,0.005412,0.001158,0.000001,0.000000 98.8250,-33.9861,-16.31,3.00,False UCAC4 280-210683,19.18716844,-34.0235259,0.00,12.58,0.00,0.0,0,,19.21311470,-33.9860957,10.57,0.00,0,0,0 395699,2012 GN12,23.15,23.9,16.1424,0,0,-0.130,1.67,,2.2 0,84.7104,2023,9,15,171.5486,350.7950,12.6001,0.37187,15.07634,9.46996,10.70,5.0,0.15 490.815,1.1660,0.0943,77,0.9999,Known errors,-1.00,-1,-1,-1 20230915_210683,59745.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org