IOTA/IOTA-ES occultation update for (25) Phocaea / TYC 4824-03241-1 event on 2023 Mar 17, 00:23 UT Visible from South America Summary ------- On 2023 Mar 17 UT, the 72.3 km diameter asteroid (25) Phocaea will occult a 10.8 mag star in the constellation Monoceros for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.51 mag to 13.19 mag (the magnitude of the asteroid) for at most 6.980 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: 96 * date and approx. time of event: 2023 Mar 17, 00:13 - 2023 Mar 17, 00:33 * geocentric midpoint of event [JD]: 2460020.51628187 * magnitude of target star: 10.79 * magnitude drop [mag]: 2.51 * estimated maximum duration [s]: 6.980 * Moon: 28 % sunlit, 149° distance * Sun: 113° distance * rough path description: South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.013", 109°) * approx speed of asteroid's shadow [km/s]: 10.3518 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4824-03241-1 by 25 Phocaea on 2023 Mar 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 - 78 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -60 24 11 .... - 77 0 0 -60 52 37 0 14 56.1 33 11 -6 -62 20 0 -59 25 25 .. .. .. -58 15 7 .... - 76 0 0 -58 35 58 0 15 10.4 36 10 -7 -60 9 15 -57 2 54 -61 24 44 -55 47 52 0.06 - 75 0 0 -55 58 54 0 15 27.8 38 9 -8 -57 38 45 -54 19 16 -58 59 33 -52 58 56 0.06 - 74 0 0 -52 57 22 0 15 49.1 41 8 -9 -54 44 32 -51 10 25 -56 11 16 -49 44 11 0.06 - 73 0 0 -49 26 35 0 16 15.5 45 6 -11 -51 21 50 -47 31 34 -52 55 8 -45 58 49 0.06 - 72 0 0 -45 21 5 0 16 48.4 49 5 -13 -47 25 10 -43 17 19 -49 5 37 -41 37 31 0.06 - 71 0 0 -40 35 12 0 17 29.1 54 4 -15 -42 48 34 -38 22 14 -44 36 38 -36 35 7 0.06 - 70 0 0 -35 4 4 0 18 19.5 60 2 -17 -37 26 38 -32 42 11 -39 22 19 -30 48 3 0.06 - 69 0 0 -28 45 59 0 19 20.4 66 359 -20 -31 16 30 -26 16 39 -33 18 57 -24 16 53 0.06 - 68 0 0 -21 45 43 0 20 31.7 73 355 -22 -24 21 12 -19 12 9 -26 28 10 -17 9 32 0.07 - 67 0 0 -14 17 15 0 21 50.7 80 343 -25 -16 52 57 -11 44 16 -19 0 43 - 9 42 41 0.07 - 66 0 0 - 6 42 23 0 23 12.5 85 297 -27 - 9 12 59 - 4 15 4 -11 17 4 - 2 18 26 0.08 - 65 0 0 0 36 6 0 24 31.7 82 227 -29 - 1 45 15 2 54 2 - 3 41 59 4 43 3 0.08 - 64 0 0 7 21 52 0 25 44.2 76 210 -30 5 11 46 9 28 49 3 24 18 11 9 10 0.09 - 63 0 0 13 27 31 0 26 48.1 70 205 -31 11 28 48 15 23 31 9 50 51 16 55 21 0.10 - 62 0 0 18 52 24 0 27 43.0 65 202 -31 17 4 12 20 38 24 15 35 6 22 2 26 0.10 - 61 0 0 23 39 35 0 28 29.7 60 201 -32 22 0 37 25 16 44 20 39 19 26 33 54 0.10 - 60 0 0 27 53 22 0 29 9.3 56 201 -31 26 22 24 29 22 51 25 7 50 30 34 5 0.10 - 59 0 0 31 38 14 0 29 42.9 52 201 -31 30 14 9 33 1 7 29 5 21 34 7 13 0.11 - 58 0 0 34 58 16 0 30 11.4 48 201 -31 33 40 6 36 15 27 32 36 15 37 17 5 0.11 - 57 0 0 37 57 0 0 30 35.8 45 202 -31 36 43 58 39 9 14 35 44 23 40 6 59 0.11 - 56 0 0 40 37 27 0 30 56.7 43 202 -30 39 28 52 41 45 21 38 33 0 42 39 42 0.11 - 55 0 0 43 2 6 0 31 14.7 40 203 -30 41 57 27 44 6 12 41 4 50 44 57 33 0.11 - 54 0 0 45 13 5 0 31 30.3 38 203 -29 44 11 54 46 13 48 43 22 8 47 2 29 0.11 - 53 0 0 47 12 9 0 31 43.9 36 204 -29 46 14 2 48 9 52 45 26 49 48 56 10 0.11 - 52 0 0 49 0 47 0 31 55.8 34 205 -28 48 5 26 49 55 48 47 20 29 50 39 57 0.11 - 51 0 0 50 40 15 0 32 6.2 32 205 -28 49 47 22 51 32 49 49 4 28 52 15 3 0.11 - 50 0 0 52 11 35 0 32 15.3 30 206 -28 51 20 58 53 1 57 50 39 54 53 42 26 0.11 - 49 0 0 53 35 44 0 32 23.5 29 207 -27 52 47 9 54 24 5 52 7 46 55 2 57 0.11 - 48 0 0 54 53 27 0 32 30.7 27 208 -27 54 6 44 55 39 58 53 28 52 56 17 22 0.11 - 47 0 0 56 5 24 0 32 37.1 26 209 -26 55 20 24 56 50 14 54 43 56 57 26 18 0.11 - 46 0 0 57 12 12 0 32 42.8 25 209 -26 56 28 46 57 55 28 55 53 35 58 30 18 0.11 - 45 0 0 58 14 19 0 32 48.0 24 210 -26 57 32 20 58 56 10 56 58 21 59 29 50 0.10 - 44 0 0 59 12 14 0 32 52.6 22 211 -25 58 31 35 59 52 44 57 58 42 60 25 21 0.10 - 43 0 0 60 6 18 0 32 56.8 21 212 -25 59 26 55 60 45 35 58 55 2 61 17 12 0.10 - 42 0 0 60 56 53 0 33 0.5 20 213 -25 60 18 39 61 35 1 59 47 43 62 5 43 0.10 - 41 0 0 61 44 17 0 33 3.9 19 214 -24 61 7 8 62 21 21 60 37 5 62 51 12 0.10 - 40 0 0 62 28 46 0 33 7.0 19 215 -24 61 52 38 63 4 50 61 23 24 63 33 52 0.10 - 39 0 0 63 10 34 0 33 9.8 18 216 -24 62 35 23 63 45 42 62 6 55 64 13 59 0.10 - 38 0 0 63 49 55 0 33 12.4 17 216 -24 63 15 37 64 24 9 62 47 52 64 51 44 0.10 - 37 0 0 64 26 59 0 33 14.7 16 217 -23 63 53 31 65 0 24 63 26 27 65 27 19 0.10 - 36 0 0 65 1 57 0 33 16.8 15 218 -23 64 29 16 65 34 35 64 2 50 66 0 53 0.10 - 35 0 0 65 34 59 0 33 18.8 15 219 -23 65 3 2 66 6 53 64 37 12 66 32 35 0.10 - 34 0 0 66 6 12 0 33 20.5 14 220 -23 65 34 57 66 37 24 65 9 41 67 2 33 0.10 - 33 0 0 66 35 44 0 33 22.2 13 221 -22 66 5 8 67 6 17 65 40 24 67 30 55 0.10 - 32 0 0 67 3 43 0 33 23.7 13 222 -22 66 33 44 67 33 39 66 9 31 67 57 47 0.10 - 31 0 0 67 30 14 0 33 25.0 12 223 -22 67 0 51 67 59 35 66 37 5 68 23 15 0.10 - 30 0 0 67 55 23 0 33 26.3 12 224 -22 67 26 33 68 24 11 67 3 15 68 47 24 0.10 - 29 0 0 68 19 16 0 33 27.5 11 225 -21 67 50 57 68 47 32 67 28 5 69 10 19 0.10 - 28 0 0 68 41 56 0 33 28.5 11 226 -21 68 14 8 69 9 42 67 51 40 69 32 6 0.10 - 27 0 0 69 3 29 0 33 29.5 10 227 -21 68 36 9 69 30 47 68 14 4 69 52 48 0.10 - 26 0 0 69 23 59 0 33 30.4 10 228 -21 68 57 6 69 50 50 68 35 23 70 12 29 0.10 - 25 0 0 69 43 28 0 33 31.3 9 228 -21 69 17 1 70 9 53 68 55 39 70 31 12 0.10 - 24 0 0 70 2 1 0 33 32.0 9 229 -21 69 35 59 70 28 2 69 14 56 70 49 1 0.10 - 23 0 0 70 19 41 0 33 32.7 8 230 -20 69 54 1 70 45 19 69 33 18 71 5 59 0.10 - 22 0 0 70 36 30 0 33 33.4 8 231 -20 70 11 13 71 1 45 69 50 47 71 22 8 0.10 - 21 0 0 70 52 31 0 33 34.0 7 232 -20 70 27 35 71 17 26 70 7 26 71 37 31 0.10 - 20 0 0 71 7 47 0 33 34.6 7 233 -20 70 43 11 71 32 21 70 23 18 71 52 11 0.10 - 19 0 0 71 22 19 0 33 35.1 7 234 -20 70 58 2 71 46 35 70 38 25 72 6 9 0.10 - 18 0 0 71 36 10 0 33 35.5 6 235 -20 71 12 12 72 0 8 70 52 50 72 19 27 0.11 - 17 0 0 71 49 23 0 33 35.9 6 236 -19 71 25 41 72 13 3 71 6 33 72 32 8 0.11 - 16 0 0 72 1 58 0 33 36.3 5 237 -19 71 38 33 72 25 21 71 19 38 72 44 14 0.11 - 15 0 0 72 13 57 0 33 36.7 5 238 -19 71 50 48 72 37 5 71 32 6 72 55 45 0.11 - 14 0 0 72 25 22 0 33 37.0 5 239 -19 72 2 28 72 48 15 71 43 58 73 6 43 0.11 - 13 0 0 72 36 14 0 33 37.3 4 240 -19 72 13 35 72 58 53 71 55 16 73 17 10 0.11 - 12 0 0 72 46 36 0 33 37.6 4 241 -19 72 24 9 73 9 1 72 6 2 73 27 6 0.11 - 11 0 0 72 56 27 0 33 37.8 4 242 -19 72 34 13 73 18 40 72 16 16 73 36 34 0.11 - 10 0 0 73 5 49 0 33 38.0 3 243 -18 72 43 48 73 27 50 72 26 1 73 45 35 0.11 - 9 0 0 73 14 44 0 33 38.2 3 244 -18 72 52 54 73 36 33 72 35 17 73 54 8 0.12 - 8 0 0 73 23 12 0 33 38.4 3 245 -18 73 1 33 73 44 49 72 44 4 74 2 16 0.12 - 7 0 0 73 31 14 0 33 38.5 2 246 -18 73 9 46 73 52 41 72 52 26 74 9 59 0.12 - 6 0 0 73 38 51 0 33 38.7 2 247 -18 73 17 33 74 0 8 73 0 21 74 17 18 0.13 - 5 0 0 73 46 4 0 33 38.8 2 247 -18 73 24 55 74 7 12 73 7 51 74 24 15 0.13 - 4 0 0 73 52 54 0 33 38.8 1 248 -18 73 31 54 74 13 53 73 14 57 74 30 48 0.14 - 3 0 0 73 59 21 0 33 38.9 1 249 -18 73 38 29 74 20 11 73 21 39 74 37 0 0.15 - 2 0 0 74 5 26 0 33 39.0 1 250 -17 73 44 43 74 26 9 73 27 59 74 42 51 0.18 - 1 0 0 74 11 10 0 33 39.0 1 251 -17 73 50 34 74 31 45 73 33 56 74 48 21 0.22 0 0 0 74 16 33 0 33 39.0 0 252 -17 73 56 4 74 37 1 73 39 32 74 53 32 0.38 1 0 0 .. .. .... .. .. .. .. .. .. 74 1 14 .. .. .. 73 44 47 .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 4824-03241-1 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 18 35.4449 DE: -04 30 16.717 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 18 35.4448 DE: -04 30 16.717 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (25) Phocaea asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.47060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 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): 0.016", 0.013", 108.673° remarks: * orbital elements for (25)Phocaea : Mean anomaly = 189.4394652922 deg Arg. of pericenter = 90.2526535914 deg Long. of node = 214.0949502207 deg Inclination = 21.6089819903 deg Eccentricity = 0.2546120869 Semimajor axis = 2.3998345826 AU Perihelion dist = 1.7888076912 AU Mag: H = 7.86, G = 0.15 Epoch of elements : MJD 60020.01631944 TDT (2023 Mar 17.0163) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Feb07,6.98,2023,3,17,0.390765,0.076912,-0.014326,1.073920,5.743311,0.005383,0.000361,0.000001,-0.000001 -70.2548,-4.5486,176.28,-1.53,False TYC 4824-03241-1,7.30984582,-4.5046436,0.00,10.79,0.00,0.0,0,,7.32901388,-4.5486121,2.51,0.00,0,0,0 25,Phocaea,13.19,72.3,2.4706,0,0,0.257,20.44,,4.2,0 0,189.1700,2023,3,16,90.2527,214.0950,21.6090,0.25461,2.39983,1.78881,7.91,5.0,0.15 1.404,0.0163,0.0133,109,0.0163,Known errors,-1.00,-1,-1,-1 20230317_3241-1,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org