IOTA/IOTA-ES occultation update for (225) Henrietta / UCAC4 435-032680 event on 2023 Feb 18, 14:24 UT Visible from China Summary ------- On 2023 Feb 18 UT, the 107.3 km diameter asteroid (225) Henrietta will occult a 11.3 mag star in the constellation Monoceros for observers along a path across China. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.09 mag to 15.37 mag (the magnitude of the asteroid) for at most 7.570 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 Feb 18, 14:17 - 2023 Feb 18, 14:31 * geocentric midpoint of event [JD]: 2459994.10052846 * magnitude of target star: 11.31 * magnitude drop [mag]: 4.09 * estimated maximum duration [s]: 7.570 * Moon: 5 % sunlit, 147° distance * Sun: 136° distance * rough path description: China The occultation path -------------------- * approximate projected width [km]: 121 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.004", 101°) * approx speed of asteroid's shadow [km/s]: 14.1763 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 435-032680 by 225 Henrietta on 2023 Feb 18 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 22 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 69 53 55 .. .. .. 69 46 33 .... 23 0 0 70 23 39 14 31 21.5 0 100 -1 70 56 59 69 50 30 71 4 28 69 43 6 .... 24 0 0 70 20 1 14 31 21.5 1 101 -1 70 53 26 69 46 47 71 0 56 69 39 22 -0.32 25 0 0 70 16 6 14 31 21.5 1 102 -1 70 49 36 69 42 46 70 57 7 69 35 21 -0.39 26 0 0 70 11 53 14 31 21.4 1 103 -1 70 45 29 69 38 28 70 53 1 69 31 1 -0.42 27 0 0 70 7 23 14 31 21.3 2 104 -2 70 41 5 69 33 51 70 48 38 69 26 23 -0.44 28 0 0 70 2 34 14 31 21.2 2 105 -2 70 36 22 69 28 56 70 43 57 69 21 27 -0.46 29 0 0 69 57 27 14 31 21.1 2 106 -2 70 31 22 69 23 43 70 38 59 69 16 12 -0.47 30 0 0 69 52 2 14 31 21.0 3 107 -2 70 26 4 69 18 10 70 33 43 69 10 38 -0.48 31 0 0 69 46 18 14 31 20.8 3 107 -3 70 20 28 69 12 19 70 28 8 69 4 45 -0.48 32 0 0 69 40 15 14 31 20.6 3 108 -3 70 14 33 69 6 8 70 22 14 68 58 32 -0.49 33 0 0 69 33 52 14 31 20.4 4 109 -3 70 8 18 68 59 37 70 16 2 68 51 59 -0.49 34 0 0 69 27 10 14 31 20.2 4 110 -3 70 1 45 68 52 46 70 9 30 68 45 6 -0.49 35 0 0 69 20 7 14 31 19.9 5 111 -4 69 54 51 68 45 34 70 2 39 68 37 53 -0.50 36 0 0 69 12 44 14 31 19.7 5 112 -4 69 47 37 68 38 2 69 55 27 68 30 18 -0.50 37 0 0 69 5 0 14 31 19.4 5 113 -4 69 40 3 68 30 8 69 47 55 68 22 22 -0.50 38 0 0 68 56 54 14 31 19.0 6 114 -5 69 32 8 68 21 52 69 40 2 68 14 4 -0.50 39 0 0 68 48 27 14 31 18.7 6 115 -5 69 23 51 68 13 14 69 31 48 68 5 24 -0.50 40 0 0 68 39 37 14 31 18.3 6 116 -5 69 15 12 68 4 14 69 23 12 67 56 21 -0.51 41 0 0 68 30 24 14 31 17.9 7 117 -5 69 6 11 67 54 50 69 14 13 67 46 54 -0.51 42 0 0 68 20 48 14 31 17.5 7 118 -6 68 56 47 67 45 2 69 4 52 67 37 4 -0.51 43 0 0 68 10 49 14 31 17.0 8 119 -6 68 47 0 67 34 50 68 55 7 67 26 50 -0.51 44 0 0 68 0 24 14 31 16.5 8 120 -6 68 36 48 67 24 14 68 44 58 67 16 10 -0.51 45 0 0 67 49 35 14 31 16.0 9 120 -7 68 26 12 67 13 12 68 34 25 67 5 5 -0.51 46 0 0 67 38 20 14 31 15.4 9 121 -7 68 15 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65 8 11 63 47 47 65 17 15 63 38 53 -0.52 60 0 0 64 9 18 14 31 2.8 16 134 -12 64 49 58 63 28 57 64 59 6 63 19 58 -0.52 61 0 0 63 50 8 14 31 1.5 16 135 -13 64 31 7 63 9 29 64 40 19 63 0 26 -0.52 62 0 0 63 30 20 14 31 0.1 17 136 -13 64 11 38 62 49 21 64 20 55 62 40 14 -0.53 63 0 0 63 9 51 14 30 58.7 17 137 -14 63 51 29 62 28 34 64 0 50 62 19 23 -0.53 64 0 0 62 48 42 14 30 57.1 18 138 -14 63 30 39 62 7 5 63 40 5 61 57 50 -0.53 65 0 0 62 26 51 14 30 55.5 18 139 -15 63 9 8 61 44 55 63 18 38 61 35 35 -0.53 66 0 0 62 4 17 14 30 53.8 19 140 -15 62 46 54 61 22 1 62 56 29 61 12 37 -0.53 67 0 0 61 40 59 14 30 52.1 20 141 -15 62 23 57 60 58 23 62 33 36 60 48 54 -0.53 68 0 0 61 16 55 14 30 50.2 20 142 -16 62 0 14 60 34 0 62 9 58 60 24 27 -0.53 69 0 0 60 52 6 14 30 48.2 21 143 -17 61 35 45 60 8 50 61 45 34 59 59 13 -0.53 70 0 0 60 26 29 14 30 46.1 21 143 -17 61 10 29 59 42 53 61 20 23 59 33 11 -0.53 71 0 0 60 0 4 14 30 44.0 22 144 -18 60 44 25 59 16 8 60 54 23 59 6 22 -0.53 72 0 0 59 32 50 14 30 41.7 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0 3 -15 20 41 -0.69 -163 0 0 -14 38 7 14 18 8.4 1 267 -36 -14 5 4 -15 11 1 -13 57 39 -15 18 20 -0.96 Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 435-032680 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 17 19.0202 DE: -03 01 14.382 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 17 19.0202 DE: -03 01 14.382 * 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: (225) Henrietta asteroid class: approx. diameter [km]: 107 approx. diameter ["]: 0.042 distance from Earth [AU]: 3.52170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#124 date of fit: 2023 Feb 07 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): 0.007", 0.004", 100.738° remarks: * orbital elements for (225)Henrietta : Mean anomaly = 177.3341585352 deg Arg. of pericenter = 103.8544555831 deg Long. of node = 197.0313295210 deg Inclination = 20.8527393808 deg Eccentricity = 0.2624943469 Semimajor axis = 3.3938039276 AU Perihelion dist = 2.5029495820 AU Mag: H = 8.85, G = 0.15 Epoch of elements : MJD 59993.60041667 TDT (2023 Feb 18.6004) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1242023Feb07,7.57,2023,2,18,14.412683,0.316754,0.345651,-5.899172,5.405899,0.004017,0.001476,0.000001,-0.000001 105.1390,-3.0634,-32.72,-11.59,False UCAC4 435-032680,7.28861673,-3.0206617,0.00,11.31,0.00,0.0,0,,7.30808519,-3.0634434,4.09,0.00,0,0,0 225,Henrietta,15.37,107.3,3.5217,0,0,-0.983,13.50,,5.4,0 0,177.2395,2023,2,18,103.8545,197.0313,20.8527,0.26249,3.39380,2.50295,8.86,5.0,0.15 1.112,0.0067,0.0037,101,0.0047,Known errors,-1.00,-1,-1,-1 20230218_032680,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org