IOTA/IOTA-ES occultation update for (12600) 1999 RM177 / TYC 1340-00140-1 event on 2024 Dec 09, 09:02 UT Visible from Summary ------- On 2024 Dec 09 UT, the 13.9403251334821 km diameter asteroid (12600) 1999 RM177 will occult a 10.2 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 7.57 mag to 17.79 mag (the magnitude of the asteroid) for at most 1.060 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 09, 08:55 - 2024 Dec 09, 09:10 * geocentric midpoint of event [JD]: 2460653.87691975 * magnitude of target star: 10.22 * magnitude drop [mag]: 7.57 * estimated maximum duration [s]: 1.060 * Moon: 59 % sunlit, 99° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.002", 91°) * approx speed of asteroid's shadow [km/s]: 13.3155 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1340-00140-1 by 12600 1999 RM177 on 2024 Dec 9 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 157 0 0 -13 26 30 9 10 21.5 1 68 -18 -13 22 9 -13 30 52 -13 19 48 -13 33 13 .... 158 0 0 -13 3 11 9 10 21.3 2 68 -19 -12 58 50 -13 7 32 -12 56 29 -13 9 53 0.17 159 0 0 -12 39 58 9 10 20.9 3 68 -20 -12 35 37 -12 44 18 -12 33 16 -12 46 39 0.23 160 0 0 -12 16 52 9 10 20.3 4 67 -21 -12 12 32 -12 21 13 -12 10 11 -12 23 34 0.26 161 0 0 -11 53 55 9 10 19.6 5 67 -22 -11 49 35 -11 58 15 -11 47 15 -12 0 36 0.27 162 0 0 -11 31 6 9 10 18.7 6 67 -23 -11 26 46 -11 35 26 -11 24 26 -11 37 47 0.28 163 0 0 -11 8 27 9 10 17.7 7 67 -24 -11 4 7 -11 12 46 -11 1 47 -11 15 7 0.29 164 0 0 -10 45 56 9 10 16.5 8 67 -25 -10 41 37 -10 50 16 -10 39 17 -10 52 36 0.30 165 0 0 -10 23 36 9 10 15.1 9 66 -26 -10 19 17 -10 27 55 -10 16 57 -10 30 15 0.30 166 0 0 -10 1 27 9 10 13.6 10 66 -27 - 9 57 8 -10 5 46 - 9 54 48 -10 8 5 0.31 167 0 0 - 9 39 28 9 10 11.8 11 66 -28 - 9 35 10 - 9 43 47 - 9 32 51 - 9 46 7 0.31 168 0 0 - 9 17 42 9 10 10.0 12 66 -29 - 9 13 24 - 9 22 0 - 9 11 4 - 9 24 19 0.31 169 0 0 - 8 56 7 9 10 7.9 13 66 -30 - 8 51 49 - 9 0 25 - 8 49 30 - 9 2 44 0.31 170 0 0 - 8 34 44 9 10 5.8 14 65 -31 - 8 30 27 - 8 39 2 - 8 28 8 - 8 41 21 0.31 171 0 0 - 8 13 35 9 10 3.4 15 65 -32 - 8 9 18 - 8 17 52 - 8 6 59 - 8 20 11 0.32 172 0 0 - 7 52 39 9 10 0.9 16 65 -33 - 7 48 22 - 7 56 56 - 7 46 4 - 7 59 15 0.32 173 0 0 - 7 31 57 9 9 58.2 18 65 -34 - 7 27 40 - 7 36 13 - 7 25 22 - 7 38 32 0.32 174 0 0 - 7 11 29 9 9 55.4 19 65 -35 - 7 7 13 - 7 15 45 - 7 4 54 - 7 18 3 0.32 175 0 0 - 6 51 15 9 9 52.4 20 65 -36 - 6 46 59 - 6 55 31 - 6 44 41 - 6 57 49 0.32 176 0 0 - 6 31 16 9 9 49.3 21 64 -37 - 6 27 1 - 6 35 32 - 6 24 43 - 6 37 50 0.32 177 0 0 - 6 11 33 9 9 46.1 22 64 -38 - 6 7 18 - 6 15 48 - 6 5 1 - 6 18 6 0.32 178 0 0 - 5 52 6 9 9 42.6 23 64 -39 - 5 47 51 - 5 56 20 - 5 45 34 - 5 58 38 0.32 179 0 0 - 5 32 54 9 9 39.1 24 64 -40 - 5 28 40 - 5 37 8 - 5 26 23 - 5 39 26 0.32 -180 0 0 - 5 13 59 9 9 35.4 25 64 -41 - 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86 0 0 - 1 31 47 8 58 35.9 53 309 -35 - 1 27 38 - 1 35 56 - 1 25 24 - 1 38 11 0.33 - 85 0 0 - 1 46 34 8 58 29.0 52 309 -34 - 1 42 24 - 1 50 43 - 1 40 10 - 1 52 58 0.33 - 84 0 0 - 2 1 39 8 58 22.1 51 308 -33 - 1 57 30 - 2 5 49 - 1 55 15 - 2 8 4 0.33 - 83 0 0 - 2 17 4 8 58 15.3 50 307 -32 - 2 12 54 - 2 21 14 - 2 10 39 - 2 23 29 0.33 - 82 0 0 - 2 32 48 8 58 8.6 49 307 -31 - 2 28 38 - 2 36 58 - 2 26 23 - 2 39 14 0.33 - 81 0 0 - 2 48 51 8 58 2.0 48 307 -30 - 2 44 40 - 2 53 1 - 2 42 25 - 2 55 17 0.33 - 80 0 0 - 3 5 12 8 57 55.4 47 306 -29 - 3 1 1 - 3 9 23 - 2 58 45 - 3 11 39 0.33 - 79 0 0 - 3 21 51 8 57 49.0 46 306 -28 - 3 17 40 - 3 26 3 - 3 15 24 - 3 28 18 0.33 - 78 0 0 - 3 38 49 8 57 42.6 45 305 -27 - 3 34 37 - 3 43 0 - 3 32 21 - 3 45 17 0.33 - 77 0 0 - 3 56 4 8 57 36.3 44 305 -26 - 3 51 52 - 4 0 16 - 3 49 36 - 4 2 32 0.33 - 76 0 0 - 4 13 37 8 57 30.2 43 305 -25 - 4 9 25 - 4 17 49 - 4 7 8 - 4 20 6 0.33 - 75 0 0 - 4 31 27 8 57 24.1 42 304 -24 - 4 27 14 - 4 35 40 - 4 24 58 - 4 37 56 0.33 - 74 0 0 - 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8 42 49 - 8 51 23 - 8 40 30 - 8 53 42 0.33 - 61 0 0 - 9 8 23 8 56 11.2 28 300 -10 - 9 4 6 - 9 12 41 - 9 1 47 - 9 15 0 0.34 - 60 0 0 - 9 29 52 8 56 6.9 27 300 -9 - 9 25 34 - 9 34 10 - 9 23 15 - 9 36 30 0.34 - 59 0 0 - 9 51 33 8 56 2.8 26 300 -8 - 9 47 15 - 9 55 51 - 9 44 55 - 9 58 11 0.34 - 58 0 0 -10 13 24 8 55 58.9 25 299 -7 -10 9 6 -10 17 43 -10 6 46 -10 20 2 0.34 - 57 0 0 -10 35 26 8 55 55.1 24 299 -6 -10 31 8 -10 39 45 -10 28 48 -10 42 5 0.34 - 56 0 0 -10 57 38 8 55 51.4 23 299 -5 -10 53 19 -11 1 57 -10 50 59 -11 4 17 0.34 - 55 0 0 -11 20 0 8 55 47.9 22 299 -4 -11 15 41 -11 24 19 -11 13 21 -11 26 39 0.34 - 54 0 0 -11 42 30 8 55 44.5 21 298 -3 -11 38 11 -11 46 50 -11 35 51 -11 49 10 0.34 - 53 0 0 -12 5 10 8 55 41.3 20 298 -2 -12 0 50 -12 9 30 -11 58 30 -12 11 50 0.34 - 52 0 0 -12 27 57 8 55 38.2 19 298 -1 -12 23 37 -12 32 17 -12 21 16 -12 34 38 0.34 - 51 0 0 -12 50 52 8 55 35.3 18 298 0 -12 46 31 -12 55 12 -12 44 11 -12 57 33 0.34 - 50 0 0 -13 13 53 8 55 32.5 17 297 1 -13 9 33 -13 18 14 -13 7 12 -13 20 35 0.34 - 49 0 0 -13 37 2 8 55 29.9 16 297 2 -13 32 41 -13 41 23 -13 30 20 -13 43 44 0.34 - 48 0 0 -14 0 16 8 55 27.5 15 297 3 -13 55 55 -14 4 37 -13 53 34 -14 6 58 0.34 - 47 0 0 -14 23 35 8 55 25.2 14 297 4 -14 19 14 -14 27 57 -14 16 53 -14 30 18 0.34 - 46 0 0 -14 47 0 8 55 23.1 13 296 5 -14 42 39 -14 51 21 -14 40 17 -14 53 43 0.34 - 45 0 0 -15 10 28 8 55 21.1 12 296 6 -15 6 7 -15 14 50 -15 3 46 -15 17 11 0.34 - 44 0 0 -15 34 1 8 55 19.3 11 296 7 -15 29 39 -15 38 22 -15 27 18 -15 40 44 0.34 - 43 0 0 -15 57 36 8 55 17.7 10 295 9 -15 53 14 -16 1 58 -15 50 53 -16 4 20 0.34 - 42 0 0 -16 21 14 8 55 16.2 9 295 10 -16 16 52 -16 25 36 -16 14 31 -16 27 58 0.34 - 41 0 0 -16 44 54 8 55 14.9 8 295 11 -16 40 32 -16 49 16 -16 38 11 -16 51 38 0.34 - 40 0 0 -17 8 35 8 55 13.7 7 295 12 -17 4 13 -17 12 58 -17 1 52 -17 15 19 0.34 - 39 0 0 -17 32 18 8 55 12.7 6 294 13 -17 27 55 -17 36 40 -17 25 34 -17 39 2 0.34 - 38 0 0 -17 56 0 8 55 11.9 5 294 14 -17 51 38 -18 0 22 -17 49 16 -18 2 44 0.34 - 37 0 0 -18 19 42 8 55 11.2 4 294 15 -18 15 20 -18 24 5 -18 12 58 -18 26 27 0.34 - 36 0 0 -18 43 23 8 55 10.7 3 293 16 -18 39 1 -18 47 46 -18 36 39 -18 50 8 0.35 - 35 0 0 -19 7 3 8 55 10.4 2 293 17 -19 2 41 -19 11 26 -19 0 19 -19 13 48 0.35 - 34 0 0 -19 30 41 8 55 10.2 1 293 18 -19 26 18 -19 35 3 -19 23 56 -19 37 25 0.38 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 1340-00140-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 26 30.2003 DE: +21 09 40.885 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 26 30.2003 DE: +21 09 40.884 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 10.2 * B mag [mag]: 10.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12600) 1999 RM177 asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.53250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Feb 10 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): 0.025", 0.002", 90.8° remarks: * orbital elements for (12600)1999 RM177 : Mean anomaly = 241.7207212290 deg Arg. of pericenter = 85.2917570363 deg Long. of node = 135.5832515835 deg Inclination = 2.2141650131 deg Eccentricity = 0.1248981203 Semimajor axis = 3.2508473160 AU Perihelion dist = 2.8448225967 AU Mag: H = 12.63, G = 0.15 Epoch of elements : MJD 60653.37692442 TDT (2024 Dec 09.3769) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Feb10,1.06,2024,12,9,9.046074,-0.017408,-0.306871,-7.503661,0.423698,-0.001902,0.000307,0.000002,0.000000 -117.2877,21.1471,42.44,-22.88,False TYC 1340-00140-1,6.44172230,21.1613568,10.75,10.22,9.93,0.1,0,,6.46695156,21.1471068,7.57,7.41,0,0,0 12600,1999 RM177,17.79,14.124,2.5325,0,0,-1.863,1.47,,1.4,0 0,241.6573,2024,12,9,85.2918,135.5833,2.2142,0.12490,3.25085,2.84482,12.63,5.0,0.15 1.270,0.0250,0.0018,91,0.0021,Known errors,2.03,0,-1,-1 20241209_0140-1,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org