IOTA/IOTA-ES occultation update for (109) Felicitas / UCAC4 277-144122 event on 2023 Jun 19, 23:22 UT Visible from S Africa, South America Summary ------- On 2023 Jun 19 UT, the 87.4 km diameter asteroid (109) Felicitas will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across S Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.13 mag to 13.85 mag (the magnitude of the asteroid) for at most 5.730 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: 100 * date and approx. time of event: 2023 Jun 19, 23:15 - 2023 Jun 19, 23:29 * geocentric midpoint of event [JD]: 2460115.47404063 * magnitude of target star: 11.89 * magnitude drop [mag]: 2.13 * estimated maximum duration [s]: 5.730 * Moon: 3 % sunlit, 161° distance * Sun: 169° distance * rough path description: S Africa, South America The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.005", 88°) * approx speed of asteroid's shadow [km/s]: 15.2660 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 277-144122 by 109 Felicitas on 2023 Jun 19 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 - 80 0 0 - 0 35 33 23 29 34.8 1 125 -2 - 0 6 41 - 1 4 24 - 0 1 7 - 1 9 57 .... - 79 0 0 - 1 17 15 23 29 34.6 2 125 -3 - 0 48 25 - 1 46 5 - 0 42 52 - 1 51 38 0.07 - 78 0 0 - 1 58 50 23 29 34.2 3 125 -4 - 1 30 2 - 2 27 38 - 1 24 29 - 2 33 11 0.03 - 77 0 0 - 2 40 17 23 29 33.6 4 125 -6 - 2 11 30 - 3 9 3 - 2 5 57 - 3 14 35 0.01 - 76 0 0 - 3 21 33 23 29 32.9 5 125 -7 - 2 52 48 - 3 50 16 - 2 47 16 - 3 55 49 0.00 - 75 0 0 - 4 2 37 23 29 32.0 7 124 -8 - 3 33 55 - 4 31 18 - 3 28 23 - 4 36 50 -0.01 - 74 0 0 - 4 43 28 23 29 30.9 8 124 -9 - 4 14 49 - 5 12 7 - 4 9 17 - 5 17 39 -0.02 - 73 0 0 - 5 24 5 23 29 29.6 9 124 -10 - 4 55 29 - 5 52 41 - 4 49 58 - 5 58 12 -0.02 - 72 0 0 - 6 4 27 23 29 28.1 10 124 -12 - 5 35 53 - 6 33 0 - 5 30 22 - 6 38 30 -0.02 - 71 0 0 - 6 44 31 23 29 26.5 11 124 -13 - 6 16 1 - 7 13 1 - 6 10 31 - 7 18 31 -0.02 - 70 0 0 - 7 24 18 23 29 24.7 13 124 -14 - 6 55 51 - 7 52 44 - 6 50 21 - 7 58 13 -0.02 - 69 0 0 - 8 3 45 23 29 22.7 14 124 -15 - 7 35 22 - 8 32 8 - 7 29 53 - 8 37 36 -0.03 - 68 0 0 - 8 42 52 23 29 20.6 15 124 -16 - 8 14 32 - 9 11 11 - 8 9 4 - 9 16 39 -0.03 - 67 0 0 - 9 21 38 23 29 18.3 16 124 -17 - 8 53 22 - 9 49 53 - 8 47 55 - 9 55 20 -0.03 - 66 0 0 -10 0 1 23 29 15.8 17 123 -18 - 9 31 49 -10 28 12 - 9 26 23 -10 33 38 -0.03 - 65 0 0 -10 38 1 23 29 13.2 18 123 -20 -10 9 53 -11 6 8 -10 4 28 -11 11 33 -0.03 - 64 0 0 -11 15 36 23 29 10.5 20 123 -21 -10 47 33 -11 43 39 -10 42 9 -11 49 4 -0.03 - 63 0 0 -11 52 47 23 29 7.6 21 123 -22 -11 24 48 -12 20 45 -11 19 24 -12 26 9 -0.03 - 62 0 0 -12 29 31 23 29 4.5 22 123 -23 -12 1 37 -12 57 25 -11 56 14 -13 2 47 -0.03 - 61 0 0 -13 5 49 23 29 1.4 23 122 -24 -12 37 59 -13 33 38 -12 32 37 -13 38 59 -0.03 - 60 0 0 -13 41 39 23 28 58.1 24 122 -25 -13 13 54 -14 9 23 -13 8 33 -14 14 44 -0.03 - 59 0 0 -14 17 1 23 28 54.6 25 122 -26 -13 49 21 -14 44 40 -13 44 1 -14 50 0 -0.03 - 58 0 0 -14 51 54 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26 -16 26 13 -15 26 9 -16 31 30 -0.03 74 0 0 -15 25 0 23 16 43.9 32 238 -31 -14 57 31 -15 52 28 -14 52 13 -15 57 46 -0.03 75 0 0 -14 50 40 23 16 39.7 31 238 -30 -14 23 6 -15 18 13 -14 17 47 -15 23 32 -0.03 76 0 0 -14 15 51 23 16 35.6 30 238 -28 -13 48 12 -14 43 29 -13 42 52 -14 48 49 -0.03 77 0 0 -13 40 34 23 16 31.5 29 238 -27 -13 12 50 -14 8 17 -13 7 29 -14 13 37 -0.03 78 0 0 -13 4 48 23 16 27.6 28 237 -26 -12 37 0 -13 32 36 -12 31 38 -13 37 58 -0.03 79 0 0 -12 28 36 23 16 23.9 27 237 -25 -12 0 43 -12 56 28 -11 55 20 -13 1 51 -0.03 80 0 0 -11 51 56 23 16 20.2 25 237 -24 -11 23 59 -12 19 54 -11 18 35 -12 25 17 -0.03 81 0 0 -11 14 51 23 16 16.7 24 237 -23 -10 46 49 -11 42 53 -10 41 25 -11 48 17 -0.03 82 0 0 -10 37 22 23 16 13.3 23 237 -22 -10 9 15 -11 5 27 -10 3 50 -11 10 52 -0.03 83 0 0 - 9 59 28 23 16 10.0 22 236 -21 - 9 31 17 -10 27 38 - 9 25 51 -10 33 3 -0.03 84 0 0 - 9 21 10 23 16 6.9 21 236 -20 - 8 52 56 - 9 49 24 - 8 47 29 - 9 54 51 -0.03 85 0 0 - 8 42 31 23 16 4.0 20 236 -18 - 8 14 12 - 9 10 49 - 8 8 45 - 9 16 16 -0.03 86 0 0 - 8 3 30 23 16 1.2 19 236 -17 - 7 35 8 - 8 31 52 - 7 29 40 - 8 37 20 -0.03 87 0 0 - 7 24 10 23 15 58.5 17 236 -16 - 6 55 44 - 7 52 35 - 6 50 15 - 7 58 4 -0.03 88 0 0 - 6 44 30 23 15 56.0 16 236 -15 - 6 16 1 - 7 12 59 - 6 10 31 - 7 18 28 -0.03 89 0 0 - 6 4 33 23 15 53.7 15 236 -14 - 5 36 0 - 6 33 4 - 5 30 30 - 6 38 34 -0.03 90 0 0 - 5 24 18 23 15 51.5 14 236 -13 - 4 55 43 - 5 52 53 - 4 50 12 - 5 58 23 -0.03 91 0 0 - 4 43 49 23 15 49.5 13 235 -11 - 4 15 11 - 5 12 26 - 4 9 39 - 5 17 57 -0.03 92 0 0 - 4 3 5 23 15 47.7 11 235 -10 - 3 34 24 - 4 31 45 - 3 28 52 - 4 37 16 -0.03 93 0 0 - 3 22 8 23 15 46.1 10 235 -9 - 2 53 25 - 3 50 50 - 2 47 53 - 3 56 22 -0.03 94 0 0 - 2 41 0 23 15 44.6 9 235 -8 - 2 12 15 - 3 9 44 - 2 6 42 - 3 15 16 -0.02 95 0 0 - 1 59 41 23 15 43.3 8 235 -7 - 1 30 54 - 2 28 27 - 1 25 21 - 2 34 0 -0.02 96 0 0 - 1 18 14 23 15 42.2 7 235 -6 - 0 49 25 - 1 47 1 - 0 43 52 - 1 52 34 -0.02 97 0 0 - 0 36 39 23 15 41.3 5 235 -4 - 0 7 49 - 1 5 28 - 0 2 16 - 1 11 1 -0.01 98 0 0 0 5 2 23 15 40.5 4 235 -3 0 33 53 - 0 23 49 0 39 26 - 0 29 22 0.00 99 0 0 0 46 47 23 15 40.0 3 235 -2 1 15 39 0 17 56 1 21 13 0 12 22 0.01 100 0 0 1 28 35 23 15 39.6 2 235 -1 1 57 27 0 59 43 2 3 1 0 54 9 0.05 101 0 0 2 10 24 23 15 39.4 1 235 0 2 39 17 1 41 32 2 44 51 1 35 58 0.25 Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 277-144122 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 58 21.5538 DE: -34 41 11.420 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 58 21.5538 DE: -34 41 11.420 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (109) Felicitas asteroid class: approx. diameter [km]: 87 approx. diameter ["]: 0.052 distance from Earth [AU]: 2.32280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.012", 0.005", 88.371° remarks: * orbital elements for (109)Felicitas : Mean anomaly = 229.3885209793 deg Arg. of pericenter = 57.5993961963 deg Long. of node = 2.7557826625 deg Inclination = 7.8455141820 deg Eccentricity = 0.3001152062 Semimajor axis = 2.6936850045 AU Perihelion dist = 1.8852691740 AU Mag: H = 9.03, G = 0.04 Epoch of elements : MJD 60114.97395833 TDT (2023 Jun 19.9740) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,5.73,2023,6,19,23.376975,-0.000676,0.023606,-8.612982,-0.247421,-0.000144,0.001108,0.000001,0.000000 11.4066,-34.6890,-170.29,23.43,False UCAC4 277-144122,17.97265383,-34.6865055,0.00,11.89,0.00,0.0,0,,17.99898740,-34.6889527,2.13,0.00,0,0,0 109,Felicitas,13.85,87.4,2.3228,0,0,-2.643,-0.93,,5.6,0 0,229.1714,2023,6,19,57.5994,2.7558,7.8455,0.30012,2.69369,1.88527,9.08,5.0,0.15 1.096,0.0120,0.0050,88,0.0050,Known errors,-1.00,-1,-1,-1 20230619_144122,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org