IOTA/IOTA-ES occultation update for (825) Tanina / UCAC4 564-023963 event on 2024 Dec 30, 08:39 UT Visible from Summary ------- On 2024 Dec 30 UT, the 12.324 km diameter asteroid (825) Tanina will occult a 11.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.80 mag to 14.23 mag (the magnitude of the asteroid) for at most 1.130 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: 94 * date and approx. time of event: 2024 Dec 30, 08:31 - 2024 Dec 30, 08:48 * geocentric midpoint of event [JD]: 2460674.86100729 * magnitude of target star: 11.52 * magnitude drop [mag]: 2.80 * estimated maximum duration [s]: 1.130 * Moon: 1 % sunlit, 174° distance * Sun: 173° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.005", 85°) * approx speed of asteroid's shadow [km/s]: 10.9532 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 564-023963 by 825 Tanina on 2024 Dec 30 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 141 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -21 49 17 .. .. .. .... 142 0 0 -21 32 1 8 48 10.3 1 65 5 -21 27 42 -21 36 20 -21 23 42 -21 40 20 .... 143 0 0 -21 6 39 8 48 10.0 2 65 4 -21 2 21 -21 10 58 -20 58 22 -21 14 58 0.37 144 0 0 -20 41 33 8 48 9.4 3 64 3 -20 37 15 -20 45 51 -20 33 17 -20 49 50 0.46 145 0 0 -20 16 42 8 48 8.7 4 64 2 -20 12 25 -20 21 0 -20 8 27 -20 24 59 0.50 146 0 0 -19 52 8 8 48 7.8 5 64 1 -19 47 51 -19 56 25 -19 43 54 -20 0 23 0.52 147 0 0 -19 27 51 8 48 6.6 6 63 0 -19 23 35 -19 32 7 -19 19 37 -19 36 5 0.54 148 0 0 -19 3 51 8 48 5.2 7 63 -1 -18 59 35 -19 8 6 -18 55 39 -19 12 3 0.55 149 0 0 -18 40 9 8 48 3.6 8 63 -2 -18 35 54 -18 44 24 -18 31 58 -18 48 20 0.56 150 0 0 -18 16 45 8 48 1.9 9 62 -3 -18 12 31 -18 21 0 -18 8 36 -18 24 56 0.57 151 0 0 -17 53 41 8 47 59.8 10 62 -4 -17 49 27 -17 57 55 -17 45 32 -18 1 50 0.57 152 0 0 -17 30 56 8 47 57.6 11 62 -5 -17 26 43 -17 35 9 -17 22 49 -17 39 4 0.57 153 0 0 -17 8 31 8 47 55.2 12 61 -6 -17 4 19 -17 12 44 -17 0 25 -17 16 38 0.58 154 0 0 -16 46 27 8 47 52.6 13 61 -7 -16 42 15 -16 50 39 -16 38 22 -16 54 33 0.58 155 0 0 -16 24 43 8 47 49.8 14 61 -8 -16 20 32 -16 28 54 -16 16 39 -16 32 48 0.58 156 0 0 -16 3 21 8 47 46.7 15 60 -9 -15 59 10 -16 7 32 -15 55 18 -16 11 24 0.59 157 0 0 -15 42 20 8 47 43.5 16 60 -10 -15 38 10 -15 46 30 -15 34 18 -15 50 22 0.59 158 0 0 -15 21 41 8 47 40.1 17 60 -11 -15 17 32 -15 25 51 -15 13 41 -15 29 43 0.59 159 0 0 -15 1 25 8 47 36.5 18 59 -12 -14 57 16 -15 5 34 -14 53 26 -15 9 25 0.59 160 0 0 -14 41 31 8 47 32.7 19 59 -13 -14 37 23 -14 45 40 -14 33 33 -14 49 31 0.59 161 0 0 -14 22 1 8 47 28.7 20 59 -14 -14 17 53 -14 26 9 -14 14 4 -14 29 59 0.59 162 0 0 -14 2 54 8 47 24.5 21 58 -15 -13 58 47 -14 7 1 -13 54 58 -14 10 51 0.59 163 0 0 -13 44 10 8 47 20.1 22 58 -16 -13 40 4 -13 48 17 -13 36 15 -13 52 6 0.59 164 0 0 -13 25 51 8 47 15.6 23 58 -17 -13 21 45 -13 29 57 -13 17 57 -13 33 46 0.59 165 0 0 -13 7 55 8 47 10.9 24 57 -18 -13 3 50 -13 12 1 -13 0 2 -13 15 49 0.60 166 0 0 -12 50 25 8 47 6.0 25 57 -19 -12 46 20 -12 54 30 -12 42 33 -12 58 17 0.60 167 0 0 -12 33 18 8 47 0.9 26 57 -20 -12 29 14 -12 37 23 -12 25 27 -12 41 10 0.60 168 0 0 -12 16 37 8 46 55.7 27 56 -21 -12 12 33 -12 20 41 -12 8 47 -12 24 27 0.60 169 0 0 -12 0 20 8 46 50.3 28 56 -22 -11 56 17 -12 4 24 -11 52 31 -12 8 10 0.60 170 0 0 -11 44 29 8 46 44.7 29 56 -23 -11 40 26 -11 48 32 -11 36 41 -11 52 18 0.60 171 0 0 -11 29 4 8 46 39.0 30 55 -24 -11 25 1 -11 33 6 -11 21 17 -11 36 52 0.60 172 0 0 -11 14 4 8 46 33.1 31 55 -25 -11 10 2 -11 18 6 -11 6 18 -11 21 51 0.60 173 0 0 -10 59 30 8 46 27.1 32 55 -25 -10 55 28 -11 3 32 -10 51 44 -11 7 16 0.60 174 0 0 -10 45 22 8 46 20.9 32 54 -26 -10 41 21 -10 49 23 -10 37 37 -10 53 7 0.60 175 0 0 -10 31 40 8 46 14.6 33 54 -27 -10 27 39 -10 35 40 -10 23 56 -10 39 24 0.60 176 0 0 -10 18 24 8 46 8.1 34 53 -28 -10 14 23 -10 22 24 -10 10 41 -10 26 7 0.60 177 0 0 -10 5 34 8 46 1.5 35 53 -29 -10 1 34 -10 9 34 - 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62 0 0 -34 34 49 8 31 32.2 1 298 -6 -34 30 22 -34 39 16 -34 26 15 -34 43 24 0.78 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 564-023963 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 09 22.1718 DE: +22 45 55.458 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 09 22.1718 DE: +22 45 55.458 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (825) Tanina asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.31450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.018", 0.005", 84.656° remarks: * orbital elements for (825)Tanina : Mean anomaly = 249.8283251047 deg Arg. of pericenter = 111.4975998313 deg Long. of node = 101.3732386895 deg Inclination = 3.4006895443 deg Eccentricity = 0.0741738069 Semimajor axis = 2.2266990470 AU Perihelion dist = 2.0615363019 AU Mag: H = 11.54, G = 0.15 Epoch of elements : MJD 60674.36100888 TDT (2024 Dec 30.3610) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,1.13,2024,12,30,8.664175,-0.064131,-0.509681,-6.133867,0.772049,0.000664,0.000056,0.000002,0.000000 -136.5195,22.7615,50.71,-23.12,False UCAC4 564-023963,6.15615883,22.7654051,11.81,11.52,11.36,0.0,0,,6.18181540,22.7614848,0.42,2.28,1,0,1 825,Tanina,14.23,12.324,1.3145,0,0,-2.966,5.16,,0.8,0 0,249.7212,2024,12,30,111.4976,101.3732,3.4007,0.07417,2.22670,2.06154,11.54,5.0,0.15 1.464,0.0180,0.0047,85,0.0060,Known errors,1.80,0,-1,-1 20241230_023963,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org