IOTA/IOTA-ES occultation update for (22) Kalliope / UCAC4 292-166274 event on 2024 Oct 29, 23:02 UT Visible from Summary ------- On 2024 Oct 29 UT, the 176.578190800378 km diameter asteroid (22) Kalliope will occult a 11.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.87 mag to 12.69 mag (the magnitude of the asteroid) for at most 5.530 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: 2024 Oct 29, 22:58 - 2024 Oct 29, 23:05 * geocentric midpoint of event [JD]: 2460613.45980458 * magnitude of target star: 11.03 * magnitude drop [mag]: 1.87 * estimated maximum duration [s]: 5.530 * Moon: 6 % sunlit, 84° distance * Sun: 57° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 177 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.009", 102°) * approx speed of asteroid's shadow [km/s]: 32.0364 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 292-166274 by 22 Kalliope #1 on 2024 Oct 29 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 160 0 0 .. .. .... .. .. .. .. .. .. - 1 51 13 .. .. .. - 2 7 23 .. .. .. .... 161 0 0 - 1 31 58 22 58 48.2 1 122 58 - 2 28 22 - 0 35 33 - 2 44 33 - 0 19 22 .... 162 0 0 - 2 9 5 22 58 48.3 2 122 59 - 3 5 28 - 1 12 41 - 3 21 38 - 0 56 31 0.07 163 0 0 - 2 46 7 22 58 48.6 4 122 60 - 3 42 29 - 1 49 45 - 3 58 38 - 1 33 36 0.04 164 0 0 - 3 23 4 22 58 48.9 5 121 61 - 4 19 23 - 2 26 44 - 4 35 32 - 2 10 35 0.03 165 0 0 - 3 59 53 22 58 49.3 6 121 62 - 4 56 10 - 3 3 36 - 5 12 18 - 2 47 28 0.02 166 0 0 - 4 36 34 22 58 49.7 7 121 63 - 5 32 48 - 3 40 20 - 5 48 55 - 3 24 13 0.02 167 0 0 - 5 13 6 22 58 50.3 8 121 65 - 6 9 16 - 4 16 55 - 6 25 22 - 4 0 49 0.01 168 0 0 - 5 49 27 22 58 50.9 9 121 66 - 6 45 34 - 4 53 20 - 7 1 38 - 4 37 15 0.01 169 0 0 - 6 25 37 22 58 51.6 11 121 67 - 7 21 39 - 5 29 34 - 7 37 43 - 5 13 30 0.01 170 0 0 - 7 1 33 22 58 52.4 12 121 68 - 7 57 31 - 6 5 35 - 8 13 34 - 5 49 32 0.01 171 0 0 - 7 37 16 22 58 53.3 13 121 69 - 8 33 9 - 6 41 22 - 8 49 10 - 6 25 21 0.01 172 0 0 - 8 12 44 22 58 54.2 14 121 70 - 9 8 32 - 7 16 56 - 9 24 32 - 7 0 56 0.01 173 0 0 - 8 47 56 22 58 55.2 15 121 71 - 9 43 39 - 7 52 13 - 9 59 37 - 7 36 15 0.00 174 0 0 - 9 22 52 22 58 56.3 16 120 73 -10 18 28 - 8 27 14 -10 34 25 - 8 11 18 0.00 175 0 0 - 9 57 29 22 58 57.5 18 120 74 -10 53 0 - 9 1 58 -11 8 54 - 8 46 3 0.00 176 0 0 -10 31 48 22 58 58.7 19 120 75 -11 27 12 - 9 36 23 -11 43 5 - 9 20 30 0.00 177 0 0 -11 5 47 22 59 0.0 20 120 76 -12 1 5 -10 10 28 -12 16 55 - 9 54 37 0.00 178 0 0 -11 39 25 22 59 1.4 21 120 77 -12 34 36 -10 44 14 -12 50 25 -10 28 25 0.00 179 0 0 -12 12 43 22 59 2.8 22 119 78 -13 7 46 -11 17 38 -13 23 33 -11 1 51 0.00 -180 0 0 -12 45 38 22 59 4.3 23 119 79 -13 40 34 -11 50 41 -13 56 19 -11 34 56 0.00 -179 0 0 -13 18 10 22 59 5.9 24 119 80 -14 12 59 -12 23 21 -14 28 41 -12 7 38 0.00 -178 0 0 -13 50 19 22 59 7.5 25 119 81 -14 45 0 -12 55 37 -15 0 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29 23 5 5.9 26 240 -30 -12 18 45 -10 28 13 -12 34 35 -10 12 23 0.00 - 44 0 0 -10 49 38 23 5 7.7 25 240 -31 -11 45 0 - 9 54 15 -12 0 52 - 9 38 23 0.00 - 43 0 0 -10 15 26 23 5 9.3 24 240 -33 -11 10 55 - 9 19 57 -11 26 49 - 9 4 3 0.00 - 42 0 0 - 9 40 55 23 5 10.9 23 240 -34 -10 36 30 - 8 45 20 -10 52 26 - 8 29 24 0.00 - 41 0 0 - 9 6 6 23 5 12.4 22 239 -35 -10 1 47 - 8 10 24 -10 17 44 - 7 54 27 0.00 - 40 0 0 - 8 30 59 23 5 13.8 20 239 -36 - 9 26 46 - 7 35 12 - 9 42 45 - 7 19 12 0.00 - 39 0 0 - 7 55 36 23 5 15.2 19 239 -37 - 8 51 28 - 6 59 43 - 9 7 28 - 6 43 42 0.00 - 38 0 0 - 7 19 57 23 5 16.5 18 239 -38 - 8 15 54 - 6 24 0 - 8 31 56 - 6 7 57 0.00 - 37 0 0 - 6 44 4 23 5 17.7 17 239 -39 - 7 40 5 - 5 48 2 - 7 56 9 - 5 31 58 0.00 - 36 0 0 - 6 7 57 23 5 18.8 16 239 -41 - 7 4 3 - 5 11 51 - 7 20 8 - 4 55 46 0.00 - 35 0 0 - 5 31 38 23 5 19.9 15 239 -42 - 6 27 48 - 4 35 28 - 6 43 54 - 4 19 22 0.01 - 34 0 0 - 4 55 8 23 5 20.9 13 239 -43 - 5 51 22 - 3 58 54 - 6 7 29 - 3 42 47 0.01 - 33 0 0 - 4 18 28 23 5 21.8 12 239 -44 - 5 14 45 - 3 22 11 - 5 30 53 - 3 6 3 0.01 - 32 0 0 - 3 41 39 23 5 22.6 11 238 -45 - 4 37 59 - 2 45 19 - 4 54 7 - 2 29 10 0.01 - 31 0 0 - 3 4 42 23 5 23.3 10 238 -46 - 4 1 4 - 2 8 20 - 4 17 14 - 1 52 11 0.01 - 30 0 0 - 2 27 39 23 5 24.0 9 238 -48 - 3 24 3 - 1 31 15 - 3 40 13 - 1 15 5 0.01 - 29 0 0 - 1 50 30 23 5 24.6 8 238 -49 - 2 46 56 - 0 54 4 - 3 3 6 - 0 37 54 0.02 - 28 0 0 - 1 13 18 23 5 25.1 6 238 -50 - 2 9 44 - 0 16 50 - 2 25 55 - 0 0 39 0.02 - 27 0 0 - 0 36 2 23 5 25.5 5 238 -51 - 1 32 30 0 20 26 - 1 48 40 0 36 37 0.03 - 26 0 0 0 1 16 23 5 25.8 4 238 -52 - 0 55 12 0 57 44 - 1 11 23 1 13 56 0.04 - 25 0 0 0 38 34 23 5 26.1 3 238 -53 - 0 17 54 1 35 2 - 0 34 5 1 51 14 0.05 - 24 0 0 1 15 51 23 5 26.2 2 238 -55 0 19 24 2 12 20 0 3 13 2 28 31 0.09 - 23 0 0 1 53 7 23 5 26.3 1 238 -56 0 56 40 2 49 34 0 40 29 .. .. .. 0.33 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 292-166274 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 13 54.8439 DE: -31 38 06.893 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 13 54.8439 DE: -31 38 06.893 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 12.4 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (22) Kalliope asteroid class: asteroid system: multiple bodies approx. diameter [km]: 177 approx. diameter ["]: 0.069 distance from Earth [AU]: 3.52840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 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): 0.017", 0.009", 101.858° remarks: * orbital elements for (22)Kalliope : Mean anomaly = 234.0566750601 deg Arg. of pericenter = 358.0040647465 deg Long. of node = 65.9744169295 deg Inclination = 13.7018956638 deg Eccentricity = 0.0988958997 Semimajor axis = 2.9106030191 AU Perihelion dist = 2.6227563148 AU Mag: H = 6.65, G = 0.21 Epoch of elements : MJD 60612.95980450 TDT (2024 Oct 29.9598) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Apr24 Binary solution 1 : Kepler,5.53,2024,10,29,23.035310,-0.001026,0.013268,18.073783,0.552669,0.004957,-0.000336,-0.000001,0.000000 -110.4162,-31.6297,-169.61,-13.86,False UCAC4 292-166274,18.23190114,-31.6352480,12.40,11.03,10.29,0.2,0,,18.25846488,-31.6297489,1.88,2.12,0,0,0 22,Kalliope #1,12.69,177.090,3.5284,0,1,3.527,1.38,,10.0,0 Linus,28,1098.600,3.595606,,94.18,2457754.50,323.200,,284.30, 0,233.8662,2024,10,29,358.0041,65.9744,13.7019,0.09890,2.91060,2.62276,6.65,5.0,0.15 1.143,0.0170,0.0093,102,0.0099,Known errors + binary orbit,0.57,0,-1,-1 20241029_166274_Ma1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org