IOTA/IOTA-ES occultation update for (1266) Tone / TYC 2871-02018-1 event on 2024 Dec 15, 18:23 UT Visible from Summary ------- On 2024 Dec 15 UT, the 80.526789568376 km diameter asteroid (1266) Tone will occult a 10.9 mag star in the constellation Perseus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.97 mag to 14.87 mag (the magnitude of the asteroid) for at most 5.820 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 15, 18:15 - 2024 Dec 15, 18:30 * geocentric midpoint of event [JD]: 2460660.26619716 * magnitude of target star: 10.93 * magnitude drop [mag]: 3.97 * estimated maximum duration [s]: 5.820 * Moon: 100 % sunlit, 30° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.004", 79°) * approx speed of asteroid's shadow [km/s]: 13.8749 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2871-02018-1 by 1266 Tone on 2024 Dec 15 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 - 26 0 0 -10 1 48 18 30 30.5 0 47 20 - 9 29 50 .. .. .. - 9 12 29 .. .. .. .... - 25 0 0 - 9 4 46 18 30 30.3 2 46 18 - 8 32 27 - 9 36 56 - 8 14 54 - 9 54 16 -0.31 - 24 0 0 - 8 6 17 18 30 29.9 3 46 17 - 7 33 37 - 8 38 48 - 7 15 53 - 8 56 19 -0.32 - 23 0 0 - 7 6 23 18 30 29.1 4 46 16 - 6 33 22 - 7 39 14 - 6 15 26 - 7 56 57 -0.33 - 22 0 0 - 6 5 3 18 30 28.1 6 46 15 - 5 31 40 - 6 38 16 - 5 13 33 - 6 56 10 -0.33 - 21 0 0 - 5 2 18 18 30 26.7 7 46 13 - 4 28 34 - 5 35 53 - 4 10 15 - 5 53 58 -0.34 - 20 0 0 - 3 58 10 18 30 25.0 9 46 12 - 3 24 4 - 4 32 6 - 3 5 33 - 4 50 23 -0.34 - 19 0 0 - 2 52 39 18 30 23.0 10 46 11 - 2 18 11 - 3 26 57 - 1 59 27 - 3 45 26 -0.34 - 18 0 0 - 1 45 46 18 30 20.6 12 46 9 - 1 10 56 - 2 20 26 - 0 52 0 - 2 39 7 -0.34 - 17 0 0 - 0 37 34 18 30 17.8 13 46 8 - 0 2 21 - 1 12 36 0 16 47 - 1 31 28 -0.34 - 16 0 0 0 31 56 18 30 14.7 15 46 6 1 7 32 - 0 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54 8 10 52 8 1 -0.37 177 0 0 52 17 53 18 16 34.2 18 317 -17 52 57 23 51 38 39 53 18 53 51 17 33 -0.37 178 0 0 51 26 16 18 16 31.4 17 318 -16 52 6 9 50 46 40 52 27 51 50 25 22 -0.38 179 0 0 50 32 54 18 16 28.7 16 319 -15 51 13 10 49 52 56 51 35 4 49 31 26 -0.38 180 0 0 49 37 45 18 16 26.1 15 320 -14 50 18 22 48 57 26 50 40 28 48 35 45 -0.38 -179 0 0 48 40 48 18 16 23.6 14 320 -13 49 21 46 48 0 9 49 44 4 47 38 17 -0.38 -178 0 0 47 42 2 18 16 21.3 13 321 -12 48 23 20 47 1 3 48 45 48 46 39 1 -0.38 -177 0 0 46 41 27 18 16 19.1 11 322 -11 47 23 3 46 0 9 47 45 42 45 37 57 -0.39 -176 0 0 45 39 2 18 16 17.0 10 323 -10 46 20 56 44 57 27 46 43 45 44 35 5 -0.39 -175 0 0 44 34 47 18 16 15.2 9 323 -9 45 16 58 43 52 56 45 39 56 43 30 26 -0.40 -174 0 0 43 28 44 18 16 13.5 8 324 -8 44 11 11 42 46 38 44 34 17 42 24 0 -0.40 -173 0 0 42 20 54 18 16 12.1 6 325 -7 43 3 35 41 38 34 43 26 48 41 15 49 -0.42 -172 0 0 41 11 18 18 16 10.9 5 325 -6 41 54 11 40 28 46 42 17 32 40 5 54 -0.44 -171 0 0 39 59 59 18 16 10.0 4 326 -5 40 43 3 39 17 16 41 6 30 38 54 19 -0.47 -170 0 0 38 47 0 18 16 9.3 2 327 -3 39 30 13 38 4 8 39 53 45 37 41 5 -0.56 -169 0 0 37 32 24 18 16 9.0 1 327 -2 38 15 45 36 49 25 38 39 21 .. .. .. -1.05 -168 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 37 23 21 .. .. .. .... Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 2871-02018-1 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 46 14.1631 DE: +42 27 38.098 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 46 14.1630 DE: +42 27 38.099 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1266) Tone asteroid class: approx. diameter [km]: 81 approx. diameter ["]: 0.042 distance from Earth [AU]: 2.63640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 date of fit: 2023 Feb 11 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): 0.027", 0.004", 78.958° remarks: * orbital elements for (1266)Tone : Mean anomaly = 163.4222192690 deg Arg. of pericenter = 303.5810602960 deg Long. of node = 320.3535127906 deg Inclination = 17.1692664765 deg Eccentricity = 0.0494636721 Semimajor axis = 3.3671441836 AU Perihelion dist = 3.2005928676 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 60659.76619599 TDT (2024 Dec 15.7662) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Feb11,5.82,2024,12,15,18.388732,-0.194476,0.287567,-6.486882,-4.387544,0.002501,-0.001593,0.000001,0.000000 56.2612,42.5406,-96.96,-23.31,False TYC 2871-02018-1,3.77060086,42.4605828,11.60,10.93,10.57,0.1,0,,3.79937852,42.5406096,3.97,3.88,0,0,0 1266,Tone,14.87,80.718,2.6364,0,0,-1.956,-14.63,,4.2,0 0,163.3000,2024,12,15,303.5811,320.3535,17.1693,0.04946,3.36714,3.20059,9.47,5.0,0.15 1.270,0.0273,0.0043,79,0.0114,Known errors,1.17,0,-1,-1 20241215_2018-1,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org