IOTA/IOTA-ES occultation update for (109) Felicitas / UCAC4 290-190202 event on 2023 Apr 16, 16:30 UT Visible from Australia Summary ------- On 2023 Apr 16 UT, the 87.4 km diameter asteroid (109) Felicitas will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.59 mag to 14.96 mag (the magnitude of the asteroid) for at most 14.680 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 Apr 16, 16:14 - 2023 Apr 16, 16:46 * geocentric midpoint of event [JD]: 2460051.18786737 * magnitude of target star: 12.47 * magnitude drop [mag]: 2.59 * estimated maximum duration [s]: 14.680 * Moon: 16 % sunlit, 63° distance * Sun: 109° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.004", 84°) * approx speed of asteroid's shadow [km/s]: 5.9522 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 290-190202 by 109 Felicitas on 2023 Apr 16 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 105 0 0 .. .. .... .. .. .. .. .. .. 8 8 59 .. .. .. 7 56 40 .. .. .. .... 106 0 0 8 4 7 16 15 16.8 1 123 -69 7 30 3 8 37 55 7 17 36 8 50 9 .... 107 0 0 7 24 7 16 15 17.5 2 123 -70 6 49 40 7 58 19 6 37 3 8 10 41 0.55 108 0 0 6 42 39 16 15 18.8 3 123 -71 6 7 46 7 17 14 5 55 1 7 29 45 0.59 109 0 0 5 59 39 16 15 20.7 5 123 -72 5 24 21 6 34 40 5 11 26 6 47 20 0.61 110 0 0 5 15 7 16 15 23.2 6 123 -73 4 39 21 5 50 34 4 26 16 6 3 23 0.62 111 0 0 4 28 58 16 15 26.3 7 123 -74 3 52 44 5 4 53 3 39 28 5 17 52 0.63 112 0 0 3 41 12 16 15 30.1 8 123 -76 3 4 28 4 17 36 2 51 1 4 30 46 0.63 113 0 0 2 51 46 16 15 34.6 10 123 -77 2 14 31 3 28 40 2 0 52 3 42 0 0.64 114 0 0 2 0 36 16 15 39.8 11 123 -78 1 22 49 2 38 2 1 8 58 2 51 34 0.64 115 0 0 1 7 41 16 15 45.8 12 123 -79 0 29 20 1 45 40 0 15 16 1 59 24 0.65 116 0 0 0 12 58 16 15 52.6 14 123 -80 - 0 25 59 0 51 32 - 0 40 16 1 5 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Uncertainty in time = +/- 3 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4 290-190202 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 30 52.7851 DE: -32 08 45.850 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 30 52.7851 DE: -32 08 45.850 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (109) Felicitas asteroid class: approx. diameter [km]: 87 approx. diameter ["]: 0.041 distance from Earth [AU]: 2.94770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Feb 09 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): 0.009", 0.004", 83.502° remarks: * orbital elements for (109)Felicitas : Mean anomaly = 215.0621797209 deg Arg. of pericenter = 57.5926570585 deg Long. of node = 2.7572147980 deg Inclination = 7.8455426492 deg Eccentricity = 0.3000642386 Semimajor axis = 2.6938084558 AU Perihelion dist = 1.8854928726 AU Mag: H = 9.04, G = 0.04 Epoch of elements : MJD 60050.68791667 TDT (2023 Apr 16.6879) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Feb09,14.68,2023,4,16,16.508817,-0.343963,-0.389650,2.517949,-2.224150,-0.005537,-0.000013,0.000000,0.000000 -174.0940,-32.1296,-67.68,10.20,False UCAC4 290-190202,18.51466250,-32.1460695,0.00,12.47,0.00,0.0,4,,18.53986267,-32.1296475,2.60,0.00,0,0,0 109,Felicitas,14.96,87.4,2.9477,0,0,0.591,-6.64,,5.6,0 0,214.9088,2023,4,16,57.5927,2.7572,7.8455,0.30006,2.69381,1.88549,9.08,5.0,0.15 1.182,0.0093,0.0040,84,0.0074,Known errors,-1.00,-1,-1,-1 20230416_190202,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org