IOTA/IOTA-ES occultation update for (380) Fiducia / TYC 6889-01154-1 event on 2023 Jun 17, 23:24 UT Visible from S Africa Summary ------- On 2023 Jun 17 UT, the 72.3 km diameter asteroid (380) Fiducia will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.98 mag to 13.11 mag (the magnitude of the asteroid) for at most 9.720 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: 2023 Jun 17, 23:10 - 2023 Jun 17, 23:39 * geocentric midpoint of event [JD]: 2460113.47580921 * magnitude of target star: 11.32 * magnitude drop [mag]: 1.98 * estimated maximum duration [s]: 9.720 * Moon: 0 % sunlit, 152° distance * Sun: 155° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.006", 84°) * approx speed of asteroid's shadow [km/s]: 7.4387 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6889-01154-1 by 380 Fiducia on 2023 Jun 17 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 - 71 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -29 43 30 .. .. .. -29 51 37 .... - 70 0 0 -29 47 23 23 39 23.1 1 116 -23 -29 25 34 -30 9 12 -29 17 29 -30 17 18 .... - 69 0 0 -30 12 35 23 39 22.7 2 115 -24 -29 50 51 -30 34 20 -29 42 48 -30 42 24 0.12 - 68 0 0 -30 37 12 23 39 22.1 3 115 -25 -30 15 32 -30 58 51 -30 7 31 -31 6 54 0.10 - 67 0 0 -31 1 13 23 39 21.3 4 114 -26 -30 39 38 -31 22 48 -30 31 38 -31 30 48 0.09 - 66 0 0 -31 24 38 23 39 20.3 5 114 -27 -31 3 9 -31 46 9 -30 55 10 -31 54 8 0.09 - 65 0 0 -31 47 29 23 39 19.0 6 113 -28 -31 26 4 -32 8 55 -31 18 7 -32 16 52 0.08 - 64 0 0 -32 9 45 23 39 17.5 7 113 -29 -31 48 25 -32 31 7 -31 40 29 -32 39 2 0.08 - 63 0 0 -32 31 27 23 39 15.8 7 112 -30 -32 10 11 -32 52 44 -32 2 17 -33 0 38 0.08 - 62 0 0 -32 52 34 23 39 13.9 8 112 -31 -32 31 22 -33 13 47 -32 23 30 -33 21 39 0.08 - 61 0 0 -33 13 7 23 39 11.9 9 111 -32 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12 9.6 24 240 0 9 4 22 8 18 25 9 12 53 8 9 53 0.07 100 0 0 9 17 25 23 12 2.9 23 240 2 9 40 20 8 54 29 9 48 50 8 45 59 0.07 101 0 0 9 53 4 23 11 56.5 22 241 3 10 15 55 9 30 11 10 24 24 9 21 42 0.07 102 0 0 10 28 19 23 11 50.4 20 241 4 10 51 8 10 5 30 10 59 35 9 57 2 0.07 103 0 0 11 3 11 23 11 44.7 19 241 5 11 25 56 10 40 26 11 34 22 10 31 59 0.07 104 0 0 11 37 38 23 11 39.3 18 241 6 12 0 19 11 14 56 12 8 45 11 6 30 0.07 105 0 0 12 11 40 23 11 34.2 17 241 7 12 34 17 11 49 1 12 42 41 11 40 37 0.07 106 0 0 12 45 15 23 11 29.5 16 241 8 13 7 49 12 22 40 13 16 11 12 14 17 0.07 107 0 0 13 18 23 23 11 25.1 15 242 9 13 40 53 12 55 52 13 49 14 12 47 31 0.07 108 0 0 13 51 4 23 11 21.0 14 242 10 14 13 30 13 28 37 14 21 50 13 20 17 0.07 109 0 0 14 23 16 23 11 17.2 13 242 12 14 45 38 14 0 53 14 53 56 13 52 34 0.07 110 0 0 14 54 59 23 11 13.8 12 242 13 15 17 18 14 32 40 15 25 34 14 24 23 0.08 111 0 0 15 26 13 23 11 10.6 11 243 14 15 48 28 15 3 58 15 56 43 14 55 43 0.08 112 0 0 15 56 57 23 11 7.8 9 243 15 16 19 8 15 34 46 16 27 21 15 26 32 0.08 113 0 0 16 27 11 23 11 5.3 8 243 16 16 49 17 16 5 4 16 57 29 15 56 51 0.08 114 0 0 16 56 54 23 11 3.1 7 243 17 17 18 56 16 34 51 17 27 6 16 26 40 0.09 115 0 0 17 26 5 23 11 1.2 6 244 18 17 48 3 17 4 6 17 56 12 16 55 57 0.09 116 0 0 17 54 44 23 10 59.6 5 244 19 18 16 38 17 32 50 18 24 45 17 24 42 0.10 117 0 0 18 22 51 23 10 58.4 4 244 20 18 44 41 18 1 1 18 52 47 17 52 55 0.10 118 0 0 18 50 26 23 10 57.4 3 245 21 19 12 12 18 28 40 19 20 16 18 20 36 0.12 119 0 0 19 17 28 23 10 56.7 2 245 22 19 39 9 18 55 47 19 47 12 18 47 43 0.15 120 0 0 19 43 57 23 10 56.3 1 245 23 20 5 34 19 22 20 20 13 35 19 14 18 0.22 121 0 0 20 9 53 23 10 56.1 0 246 24 .. .. .. 19 48 20 .. .. .. 19 40 20 13.18 Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 6889-01154-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 32 37.4579 DE: -22 50 36.610 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 32 37.4579 DE: -22 50 36.610 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (380) Fiducia asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.066 distance from Earth [AU]: 1.52180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 date of fit: 2023 Apr 24 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): 0.029", 0.006", 84.325° remarks: * orbital elements for (380)Fiducia : Mean anomaly = 315.9577943454 deg Arg. of pericenter = 240.2554756464 deg Long. of node = 95.0244267834 deg Inclination = 6.1619070350 deg Eccentricity = 0.1127721781 Semimajor axis = 2.6781643185 AU Perihelion dist = 2.3761418951 AU Mag: H = 9.57, G = 0.15 Epoch of elements : MJD 60112.97562500 TDT (2023 Jun 17.9756) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,9.72,2023,6,17,23.419421,0.040124,-0.078972,-3.744035,-1.900141,-0.002302,-0.000276,0.000001,0.000000 36.2649,-22.7931,-171.04,23.39,False TYC 6889-01154-1,19.54373831,-22.8435027,0.00,11.32,0.00,0.0,0,,19.56734663,-22.7931457,1.98,0.00,0,0,0 380,Fiducia,13.11,72.3,1.5218,0,0,-1.565,-10.98,,4.2,0 0,315.7384,2023,6,17,240.2555,95.0244,6.1619,0.11277,2.67816,2.37614,9.58,5.0,0.15 1.186,0.0293,0.0063,84,0.0122,Known errors,-1.00,-1,-1,-1 20230617_1154-1,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org