IOTA/IOTA-ES occultation update for (925) Alphonsina / UCAC4-233-085233 event on 2023 Feb 27, 18:30 UT Visible from Australia Summary ------- On 2023 Feb 27 UT, the 59.7 km diameter asteroid (925) Alphonsina will occult a 12.5 mag star in the constellation Lupus 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 1.32 mag to 13.39 mag (the magnitude of the asteroid) for at most 4.170 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 27, 18:23 - 2023 Feb 27, 18:38 * geocentric midpoint of event [JD]: 2460003.27132338 * magnitude of target star: 12.45 * magnitude drop [mag]: 1.32 * estimated maximum duration [s]: 4.170 * Moon: 54 % sunlit, 155° distance * Sun: 99° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.003", 94°) * approx speed of asteroid's shadow [km/s]: 14.3206 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-233-085233 by 925 Alphonsina on 2023 Feb 27 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 116 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 38 52 57 .. .. .. .... 117 0 0 38 18 59 18 23 20.9 1 153 -50 37 43 37 38 54 27 37 22 9 39 16 2 .... 118 0 0 36 45 22 18 23 21.3 3 153 -50 36 9 27 37 21 21 35 47 40 37 43 16 -0.02 119 0 0 35 7 59 18 23 22.2 5 154 -50 34 31 33 35 44 30 34 9 27 36 6 44 -0.05 120 0 0 33 26 52 18 23 23.5 6 155 -51 32 49 56 34 3 54 32 27 32 34 26 26 -0.06 121 0 0 31 42 2 18 23 25.5 8 155 -51 31 4 37 32 19 32 30 41 55 32 42 22 -0.07 122 0 0 29 53 31 18 23 28.0 10 156 -51 29 15 39 30 31 28 28 52 41 30 54 35 -0.08 123 0 0 28 1 25 18 23 31.1 12 156 -51 27 23 7 28 39 48 26 59 54 29 3 10 -0.08 124 0 0 26 5 52 18 23 35.0 15 157 -51 25 27 12 26 44 38 25 3 44 27 8 14 -0.08 125 0 0 24 7 3 18 23 39.5 17 157 -51 23 28 2 24 46 9 23 4 22 25 9 58 -0.08 126 0 0 22 5 10 18 23 44.8 19 158 -50 21 25 51 22 44 34 21 2 1 23 8 33 -0.08 127 0 0 20 0 29 18 23 50.9 21 158 -50 19 20 57 20 40 8 18 56 58 21 4 17 -0.09 128 0 0 17 53 20 18 23 57.8 24 158 -49 17 13 36 18 33 10 16 49 31 18 57 25 -0.09 129 0 0 15 44 4 18 24 5.5 26 159 -48 15 4 12 16 24 1 14 40 2 16 48 21 -0.09 130 0 0 13 33 3 18 24 14.1 28 159 -48 12 53 8 14 13 4 12 28 56 14 37 26 -0.09 131 0 0 11 20 44 18 24 23.4 31 159 -47 10 40 49 12 0 44 10 16 37 12 25 6 -0.09 132 0 0 9 7 33 18 24 33.4 33 160 -46 8 27 42 9 47 29 8 3 33 10 11 49 -0.09 133 0 0 6 53 58 18 24 44.2 36 160 -44 6 14 16 7 33 46 5 50 12 7 58 1 -0.09 134 0 0 4 40 28 18 24 55.6 38 160 -43 4 0 59 5 20 4 3 37 2 5 44 11 -0.09 135 0 0 2 27 32 18 25 7.7 40 160 -42 1 48 18 3 6 52 1 24 32 3 30 49 -0.10 136 0 0 0 15 36 18 25 20.3 43 161 -40 - 0 23 18 0 54 36 - 0 46 53 1 18 21 -0.10 137 0 0 - 1 54 53 18 25 33.4 45 161 -39 - 2 33 24 - 1 16 16 - 2 56 45 - 0 52 45 -0.10 138 0 0 - 4 3 32 18 25 46.9 48 161 -37 - 4 41 36 - 3 25 21 - 5 4 41 - 3 2 5 -0.10 139 0 0 - 6 9 57 18 26 0.7 50 162 -36 - 6 47 33 - 5 32 15 - 7 10 20 - 5 9 17 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-0.11 -101 0 0 -47 32 25 18 37 32.3 21 228 51 -47 53 18 -47 11 31 -48 5 59 -46 58 49 -0.11 -100 0 0 -46 58 40 18 37 34.8 21 228 51 -47 19 48 -46 37 30 -47 32 38 -46 24 38 -0.11 - 99 0 0 -46 23 30 18 37 37.2 20 227 52 -46 44 54 -46 2 4 -46 57 54 -45 49 2 -0.11 - 98 0 0 -45 46 52 18 37 39.7 19 226 52 -46 8 33 -45 25 10 -46 21 43 -45 11 58 -0.11 - 97 0 0 -45 8 44 18 37 42.0 18 226 53 -45 30 43 -44 46 45 -45 44 3 -44 33 22 -0.10 - 96 0 0 -44 29 2 18 37 44.3 17 225 54 -44 51 18 -44 6 45 -45 4 49 -43 53 11 -0.10 - 95 0 0 -43 47 42 18 37 46.5 16 224 54 -44 10 16 -43 25 6 -44 23 58 -43 11 22 -0.10 - 94 0 0 -43 4 40 18 37 48.7 15 223 55 -43 27 33 -42 41 45 -43 41 27 -42 27 49 -0.10 - 93 0 0 -42 19 52 18 37 50.7 14 223 56 -42 43 5 -41 56 38 -42 57 11 -41 42 30 -0.10 - 92 0 0 -41 33 15 18 37 52.7 13 222 57 -41 56 48 -41 9 40 -42 11 6 -40 55 20 -0.10 - 91 0 0 -40 44 44 18 37 54.6 12 221 57 -41 8 38 -40 20 48 -41 23 9 -40 6 15 -0.10 - 90 0 0 -39 54 15 18 37 56.3 10 221 58 -40 18 31 -39 29 57 -40 33 14 -39 15 11 -0.10 - 89 0 0 -39 1 43 18 37 57.9 9 220 59 -39 26 21 -38 37 3 -39 41 19 -38 22 3 -0.10 - 88 0 0 -38 7 5 18 37 59.3 8 220 59 -38 32 6 -37 42 2 -38 47 17 -37 26 48 -0.10 - 87 0 0 -37 10 15 18 38 0.6 7 219 60 -37 35 39 -36 44 48 -37 51 4 -36 29 20 -0.09 - 86 0 0 -36 11 9 18 38 1.7 6 218 61 -36 36 57 -35 45 18 -36 52 37 -35 29 35 -0.09 - 85 0 0 -35 9 42 18 38 2.6 4 218 61 -35 35 56 -34 43 27 -35 51 51 -34 27 28 -0.09 - 84 0 0 -34 5 51 18 38 3.3 3 217 62 -34 32 30 -33 39 10 -34 48 40 -33 22 56 -0.08 - 83 0 0 -32 59 30 18 38 3.7 2 217 62 -33 26 35 -32 32 23 -33 43 1 -32 15 54 -0.05 - 82 0 0 -31 50 36 18 38 3.9 0 216 63 -32 18 7 .. .. .. -32 34 50 .. .. .. 0.52 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-233-085233 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 15 14.1724 DE: -43 27 15.532 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 15 14.1724 DE: -43 27 15.532 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (925) Alphonsina asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.036 distance from Earth [AU]: 2.27240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#112 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): 0.014", 0.003", 94.15° remarks: * orbital elements for (925)Alphonsina : Mean anomaly = 64.6111733761 deg Arg. of pericenter = 201.6440241448 deg Long. of node = 299.5209631457 deg Inclination = 21.0970363605 deg Eccentricity = 0.0809908096 Semimajor axis = 2.7004189478 AU Perihelion dist = 2.4817098309 AU Mag: H = 8.44, G = 0.15 Epoch of elements : MJD 60002.77118056 TDT (2023 Feb 27.7712) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1122023Feb09,4.17,2023,2,27,18.511761,0.098043,0.072954,4.833631,-6.478404,-0.005347,0.002052,0.000000,0.000000 154.1883,-43.5378,-94.50,-8.23,False UCAC4-233-085233,15.25393675,-43.4543142,0.00,12.45,0.00,0.0,0,,15.27972306,-43.5378497,1.32,0.00,0,0,0 925,Alphonsina,13.39,59.7,2.2724,0,0,1.721,-25.07,,3.2,0 0,64.4399,2023,2,27,201.6440,299.5210,21.0970,0.08099,2.70042,2.48171,8.46,5.0,0.15 1.304,0.0143,0.0030,94,0.0110,Known errors,-1.00,-1,-1,-1 20230227_085233,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org