IOTA/IOTA-ES occultation update for (971) Alsatia / TYC 61-01222-1 event on 2024 Dec 01, 07:29 UT Visible from Summary ------- On 2024 Dec 01 UT, the 62.833 km diameter asteroid (971) Alsatia will occult a 10.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.58 mag to 13.27 mag (the magnitude of the asteroid) for at most 6.650 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 Dec 01, 07:18 - 2024 Dec 01, 07:40 * geocentric midpoint of event [JD]: 2460645.81235263 * magnitude of target star: 10.80 * magnitude drop [mag]: 2.58 * estimated maximum duration [s]: 6.650 * Moon: 0 % sunlit, 149° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.004", 65°) * approx speed of asteroid's shadow [km/s]: 9.4506 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 61-01222-1 by 971 Alsatia on 2024 Dec 1 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 129 0 0 10 33 5 7 40 45.0 0 85 17 10 50 39 10 15 30 11 1 26 10 4 42 .... 130 0 0 10 38 18 7 40 44.8 1 85 16 10 55 51 10 20 44 11 6 37 10 9 56 0.13 131 0 0 10 43 5 7 40 44.4 2 85 15 11 0 37 10 25 32 11 11 23 10 14 44 0.17 132 0 0 10 47 26 7 40 43.8 3 85 14 11 4 58 10 29 53 11 15 43 10 19 6 0.19 133 0 0 10 51 21 7 40 43.0 4 85 13 11 8 52 10 33 49 11 19 37 10 23 2 0.20 134 0 0 10 54 51 7 40 42.0 5 86 12 11 12 21 10 37 19 11 23 6 10 26 32 0.21 135 0 0 10 57 54 7 40 40.8 6 86 11 11 15 24 10 40 23 11 26 8 10 29 36 0.21 136 0 0 11 0 32 7 40 39.4 7 86 10 11 18 2 10 43 1 11 28 46 10 32 15 0.21 137 0 0 11 2 44 7 40 37.8 8 86 10 11 20 13 10 45 14 11 30 57 10 34 28 0.22 138 0 0 11 4 31 7 40 36.0 9 86 9 11 22 0 10 47 1 11 32 43 10 36 15 0.22 139 0 0 11 5 52 7 40 34.0 10 87 8 11 23 20 10 48 22 11 34 4 10 37 36 0.22 140 0 0 11 6 47 7 40 31.8 11 87 7 11 24 16 10 49 17 11 34 59 10 38 32 0.22 141 0 0 11 7 17 7 40 29.4 12 87 6 11 24 45 10 49 48 11 35 29 10 39 2 0.22 142 0 0 11 7 22 7 40 26.8 13 87 5 11 24 50 10 49 52 11 35 33 10 39 7 0.22 143 0 0 11 7 1 7 40 24.1 14 87 4 11 24 29 10 49 32 11 35 13 10 38 47 0.22 144 0 0 11 6 15 7 40 21.1 15 87 3 11 23 44 10 48 46 11 34 27 10 38 1 0.22 145 0 0 11 5 4 7 40 18.0 16 88 2 11 22 33 10 47 35 11 33 16 10 36 50 0.22 146 0 0 11 3 28 7 40 14.6 17 88 2 11 20 57 10 45 59 11 31 40 10 35 13 0.22 147 0 0 11 1 27 7 40 11.1 18 88 1 11 18 56 10 43 57 11 29 39 10 33 12 0.22 148 0 0 10 59 1 7 40 7.4 19 88 0 11 16 30 10 41 31 11 27 13 10 30 45 0.22 149 0 0 10 56 10 7 40 3.5 20 88 -1 11 13 39 10 38 39 11 24 23 10 27 54 0.22 150 0 0 10 52 54 7 39 59.5 21 88 -2 11 10 23 10 35 23 11 21 7 10 24 37 0.22 151 0 0 10 49 13 7 39 55.2 22 89 -3 11 6 43 10 31 42 11 17 27 10 20 56 0.22 152 0 0 10 45 8 7 39 50.8 23 89 -4 11 2 38 10 27 36 11 13 22 10 16 50 0.22 153 0 0 10 40 37 7 39 46.1 24 89 -5 10 58 8 10 23 5 11 8 53 10 12 19 0.22 154 0 0 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52 21 -35 6 4 -36 3 15 0.24 - 55 0 0 -35 42 34 7 18 53.0 5 280 -11 -35 24 53 -36 0 16 -35 14 2 -36 11 9 0.25 - 54 0 0 -35 50 8 7 18 52.2 4 280 -10 -35 32 29 -36 7 49 -35 21 39 -36 18 42 0.25 - 53 0 0 -35 57 22 7 18 51.6 3 279 -9 -35 39 44 -36 15 2 -35 28 54 -36 25 54 0.25 - 52 0 0 -36 4 16 7 18 51.1 3 278 -9 -35 46 38 -36 21 54 -35 35 49 -36 32 45 0.25 - 51 0 0 -36 10 48 7 18 50.7 2 278 -8 -35 53 11 -36 28 25 -35 42 23 -36 39 15 0.26 - 50 0 0 -36 16 59 7 18 50.5 1 277 -7 -35 59 24 -36 34 35 -35 48 36 -36 45 25 0.29 - 49 0 0 -36 22 49 7 18 50.4 0 277 -7 -36 5 15 -36 40 24 -35 54 28 -36 51 13 0.85 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 61-01222-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 00 10.3017 DE: +05 13 32.982 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 00 10.3016 DE: +05 13 32.981 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.8 * B mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (971) Alsatia asteroid class: approx. diameter [km]: 63 approx. diameter ["]: 0.064 distance from Earth [AU]: 1.34610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.026", 0.004", 64.51° remarks: * orbital elements for (971)Alsatia : Mean anomaly = 334.3231379334 deg Arg. of pericenter = 6.2467915700 deg Long. of node = 83.4754906405 deg Inclination = 13.7954958955 deg Eccentricity = 0.1638337714 Semimajor axis = 2.6403433597 AU Perihelion dist = 2.2077659494 AU Mag: H = 10.14, G = 0.15 Epoch of elements : MJD 60645.31235104 TDT (2024 Dec 01.3124) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,6.65,2024,12,1,7.496463,-0.089015,-0.205614,-4.894346,2.121077,0.002036,0.001670,0.000001,0.000000 -137.7231,5.3261,64.84,-21.89,False TYC 61-01222-1,3.00286159,5.2258284,11.08,10.80,10.65,0.0,0,,3.02504738,5.3261008,2.58,2.31,0,0,0 971,Alsatia,13.27,62.833,1.3461,0,0,-2.140,13.86,,3.4,0 0,334.2514,2024,12,1,6.2468,83.4755,13.7955,0.16383,2.64034,2.20777,10.14,5.0,0.15 1.307,0.0260,0.0040,65,0.0198,Known errors,1.19,0,-1,-1 20241201_1222-1,60140.72 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org