IOTA/IOTA-ES occultation update for (7814) 1986 CF2 / TYC 7376-00472-1 event on 2024 Oct 23, 19:55 UT Visible from Summary ------- On 2024 Oct 23 UT, the 19.087 km diameter asteroid (7814) 1986 CF2 will occult a 11.6 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.79 mag to 18.42 mag (the magnitude of the asteroid) for at most 0.560 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: 99 * date and approx. time of event: 2024 Oct 23, 19:52 - 2024 Oct 23, 19:58 * geocentric midpoint of event [JD]: 2460607.33019333 * magnitude of target star: 11.63 * magnitude drop [mag]: 6.79 * estimated maximum duration [s]: 0.560 * Moon: 55 % sunlit, 150° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 34.0356 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7376-00472-1 by 7814 1986 CF2 on 2024 Oct 23 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -159 0 0 - 6 13 47 19 52 21.7 0 121 53 - 6 19 51 - 6 7 42 - 6 23 46 - 6 3 48 .... -158 0 0 - 6 50 15 19 52 21.7 1 121 54 - 6 56 19 - 6 44 11 - 7 0 13 - 6 40 17 0.09 -157 0 0 - 7 26 26 19 52 21.9 3 121 55 - 7 32 29 - 7 20 23 - 7 36 23 - 7 16 29 0.03 -156 0 0 - 8 2 18 19 52 22.1 4 121 56 - 8 8 20 - 7 56 16 - 8 12 14 - 7 52 22 0.00 -155 0 0 - 8 37 51 19 52 22.4 5 121 57 - 8 43 52 - 8 31 49 - 8 47 45 - 8 27 56 -0.01 -154 0 0 - 9 13 3 19 52 22.7 6 121 58 - 9 19 3 - 9 7 2 - 9 22 56 - 9 3 10 -0.01 -153 0 0 - 9 47 53 19 52 23.2 7 121 60 - 9 53 53 - 9 41 54 - 9 57 45 - 9 38 2 -0.02 -152 0 0 -10 22 22 19 52 23.7 8 120 61 -10 28 21 -10 16 23 -10 32 12 -10 12 32 -0.02 -151 0 0 -10 56 27 19 52 24.2 10 120 62 -11 2 25 -10 50 29 -11 6 16 -10 46 38 -0.03 -150 0 0 -11 30 9 19 52 24.9 11 120 63 -11 36 6 -11 24 11 -11 39 56 -11 20 21 -0.03 -149 0 0 -12 3 26 19 52 25.6 12 120 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7376-00472-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 39 16.5602 DE: -31 12 32.175 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 39 16.5601 DE: -31 12 32.175 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7814) 1986 CF2 asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.18520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 25 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): 0.011", 0.003", 77.737° remarks: * orbital elements for (7814)1986 CF2 : Mean anomaly = 280.3544140476 deg Arg. of pericenter = 65.7684920436 deg Long. of node = 314.8032186405 deg Inclination = 16.9538965574 deg Eccentricity = 0.1657891169 Semimajor axis = 2.7512242192 AU Perihelion dist = 2.2951011856 AU Mag: H = 12.80, G = 0.15 Epoch of elements : MJD 60606.83019317 TDT (2024 Oct 23.8302) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.56,2024,10,23,19.924640,-0.009693,0.052209,18.913109,3.367994,0.004747,-0.000613,-0.000001,0.000000 -66.3761,-31.2240,-122.82,-11.79,False TYC 7376-00472-1,17.65460011,-31.2089375,12.20,11.63,11.32,0.0,4,,17.68102629,-31.2239876,6.79,6.65,0,0,0 7814,1986 CF2,18.42,19.087,3.1852,0,0,4.071,9.30,,1.2,0 0,280.1751,2024,10,23,65.7685,314.8032,16.9539,0.16579,2.75122,2.29510,12.80,5.0,0.15 1.322,0.0113,0.0026,78,0.0027,Known errors,0.85,0,-1,-1 20241023_0472-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org