IOTA/IOTA-ES occultation update for (489) Comacina / UCAC4 384-086043 event on 2024 Nov 01, 21:31 UT Visible from Summary ------- On 2024 Nov 01 UT, the 136.556 km diameter asteroid (489) Comacina will occult a 12.0 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.75 mag to 14.65 mag (the magnitude of the asteroid) for at most 3.600 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: 100 * date and approx. time of event: 2024 Nov 01, 21:28 - 2024 Nov 01, 21:34 * geocentric midpoint of event [JD]: 2460616.39676537 * magnitude of target star: 11.99 * magnitude drop [mag]: 2.75 * estimated maximum duration [s]: 3.600 * Moon: 0 % sunlit, 44° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 93°) * approx speed of asteroid's shadow [km/s]: 37.9350 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 384-086043 by 489 Comacina on 2024 Nov 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 175 0 0 10 29 8 21 28 32.6 1 104 44 9 51 0 11 7 16 9 45 2 11 13 15 .... 176 0 0 10 14 43 21 28 32.7 2 104 45 9 36 35 10 52 53 9 30 36 10 58 52 0.02 177 0 0 10 0 9 21 28 32.8 3 104 46 9 21 59 10 38 20 9 16 1 10 44 19 0.00 178 0 0 9 45 26 21 28 33.0 4 104 47 9 7 14 10 23 38 9 1 16 10 29 37 -0.01 179 0 0 9 30 33 21 28 33.2 5 104 48 8 52 20 10 8 47 8 46 21 10 14 46 -0.02 -180 0 0 9 15 31 21 28 33.5 6 104 49 8 37 17 9 53 46 8 31 18 9 59 46 -0.02 -179 0 0 9 0 21 21 28 33.8 7 105 50 8 22 6 9 38 37 8 16 7 9 44 37 -0.02 -178 0 0 8 45 2 21 28 34.2 8 105 51 8 6 46 9 23 20 8 0 46 9 29 20 -0.02 -177 0 0 8 29 36 21 28 34.7 9 105 52 7 51 18 9 7 54 7 45 18 9 13 54 -0.03 -176 0 0 8 14 1 21 28 35.1 10 105 53 7 35 42 8 52 21 7 29 42 8 58 21 -0.03 -175 0 0 7 58 19 21 28 35.7 11 105 54 7 19 59 8 36 40 7 13 59 8 42 40 -0.03 -174 0 0 7 42 29 21 28 36.3 12 105 54 7 4 9 8 20 51 6 58 9 8 26 52 -0.03 -173 0 0 7 26 33 21 28 36.9 13 105 55 6 48 11 8 4 56 6 42 11 8 10 57 -0.03 -172 0 0 7 10 30 21 28 37.6 14 106 56 6 32 8 7 48 54 6 26 7 7 54 55 -0.03 -171 0 0 6 54 21 21 28 38.4 15 106 57 6 15 58 7 32 46 6 9 57 7 38 47 -0.03 -170 0 0 6 38 6 21 28 39.2 16 106 58 5 59 42 7 16 32 5 53 41 7 22 33 -0.03 -169 0 0 6 21 46 21 28 40.1 17 106 59 5 43 20 7 0 12 5 37 19 7 6 13 -0.03 -168 0 0 6 5 20 21 28 41.0 18 106 60 5 26 53 6 43 47 5 20 53 6 49 48 -0.03 -167 0 0 5 48 49 21 28 42.0 19 106 61 5 10 22 6 27 17 5 4 21 6 33 18 -0.03 -166 0 0 5 32 13 21 28 43.0 20 106 62 4 53 46 6 10 42 4 47 44 6 16 43 -0.03 -165 0 0 5 15 33 21 28 44.1 21 106 63 4 37 5 5 54 2 4 31 4 6 0 4 -0.03 -164 0 0 4 58 50 21 28 45.2 22 106 64 4 20 21 5 37 19 4 14 19 5 43 21 -0.03 -163 0 0 4 42 2 21 28 46.4 23 107 64 4 3 33 5 20 32 3 57 31 5 26 34 -0.03 -162 0 0 4 25 12 21 28 47.6 24 107 65 3 46 42 5 3 42 3 40 40 5 9 44 -0.03 -161 0 0 4 8 18 21 28 48.9 25 107 66 3 29 48 4 46 49 3 23 46 4 52 51 -0.03 -160 0 0 3 51 22 21 28 50.3 26 107 67 3 12 52 4 29 54 3 6 50 4 35 56 -0.03 -159 0 0 3 34 24 21 28 51.7 28 107 68 2 55 53 4 12 56 2 49 52 4 18 58 -0.03 -158 0 0 3 17 24 21 28 53.1 29 107 69 2 38 53 3 55 56 2 32 51 4 1 58 -0.04 -157 0 0 3 0 23 21 28 54.6 30 107 69 2 21 51 3 38 55 2 15 50 3 44 57 -0.04 -156 0 0 2 43 20 21 28 56.1 31 107 70 2 4 49 3 21 52 1 58 47 3 27 55 -0.04 -155 0 0 2 26 17 21 28 57.7 32 107 71 1 47 46 3 4 49 1 41 44 3 10 51 -0.04 -154 0 0 2 9 13 21 28 59.3 33 107 71 1 30 42 2 47 46 1 24 40 2 53 48 -0.04 -153 0 0 1 52 10 21 29 1.0 34 107 72 1 13 39 2 30 42 1 7 37 2 36 44 -0.04 -152 0 0 1 35 7 21 29 2.8 35 107 73 0 56 36 2 13 39 0 50 34 2 19 41 -0.04 -151 0 0 1 18 5 21 29 4.5 36 107 73 0 39 34 1 56 37 0 33 32 2 2 39 -0.04 -150 0 0 1 1 3 21 29 6.4 37 107 74 0 22 33 1 39 35 0 16 31 1 45 37 -0.04 -149 0 0 0 44 4 21 29 8.2 38 107 74 0 5 33 1 22 35 - 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9 16 56 -0.04 - 27 0 0 - 9 50 7 21 33 59.4 19 259 -26 -10 27 45 - 9 12 29 -10 33 38 - 9 6 35 -0.04 - 26 0 0 - 9 39 34 21 34 0.4 18 259 -27 -10 17 13 - 9 1 55 -10 23 7 - 8 56 1 -0.04 - 25 0 0 - 9 28 48 21 34 1.2 17 259 -28 -10 6 28 - 8 51 7 -10 12 22 - 8 45 12 -0.04 - 24 0 0 - 9 17 48 21 34 2.1 16 259 -29 - 9 55 30 - 8 40 5 -10 1 24 - 8 34 11 -0.04 - 23 0 0 - 9 6 34 21 34 2.9 15 259 -30 - 9 44 18 - 8 28 50 - 9 50 12 - 8 22 55 -0.04 - 22 0 0 - 8 55 8 21 34 3.6 14 258 -31 - 9 32 53 - 8 17 22 - 9 38 47 - 8 11 27 -0.04 - 21 0 0 - 8 43 28 21 34 4.3 13 258 -32 - 9 21 15 - 8 5 41 - 9 27 9 - 7 59 46 -0.04 - 20 0 0 - 8 31 36 21 34 4.9 12 258 -33 - 9 9 24 - 7 53 47 - 9 15 19 - 7 47 51 -0.04 - 19 0 0 - 8 19 30 21 34 5.5 11 258 -34 - 8 57 20 - 7 41 40 - 9 3 15 - 7 35 44 -0.03 - 18 0 0 - 8 7 13 21 34 6.1 10 258 -35 - 8 45 4 - 7 29 21 - 8 50 59 - 7 23 25 -0.03 - 17 0 0 - 7 54 43 21 34 6.6 9 258 -36 - 8 32 36 - 7 16 50 - 8 38 31 - 7 10 54 -0.03 - 16 0 0 - 7 42 1 21 34 7.0 8 258 -37 - 8 19 55 - 7 4 6 - 8 25 51 - 6 58 10 -0.03 - 15 0 0 - 7 29 8 21 34 7.4 7 257 -38 - 8 7 3 - 6 51 11 - 8 12 59 - 6 45 15 -0.03 - 14 0 0 - 7 16 3 21 34 7.7 6 257 -39 - 7 54 0 - 6 38 5 - 7 59 56 - 6 32 8 -0.03 - 13 0 0 - 7 2 46 21 34 8.0 5 257 -40 - 7 40 45 - 6 24 47 - 7 46 41 - 6 18 50 -0.03 - 12 0 0 - 6 49 19 21 34 8.2 4 257 -41 - 7 27 19 - 6 11 18 - 7 33 16 - 6 5 21 -0.02 - 11 0 0 - 6 35 41 21 34 8.4 3 257 -42 - 7 13 42 - 5 57 38 - 7 19 39 - 5 51 41 -0.02 - 10 0 0 - 6 21 52 21 34 8.5 2 257 -43 - 6 59 54 - 5 43 48 - 7 5 52 - 5 37 50 0.00 - 9 0 0 - 6 7 53 21 34 8.6 1 257 -44 - 6 45 57 - 5 29 47 - 6 51 54 - 5 23 50 0.05 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 384-086043 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 40 44.2387 DE: -13 12 29.289 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 40 44.2386 DE: -13 12 29.289 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (489) Comacina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.050 distance from Earth [AU]: 3.78010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 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): 0.013", 0.004", 92.582° remarks: * orbital elements for (489)Comacina : Mean anomaly = 97.4299127232 deg Arg. of pericenter = 8.3476559660 deg Long. of node = 166.6825771992 deg Inclination = 12.9911634547 deg Eccentricity = 0.0485218407 Semimajor axis = 3.1525129192 AU Perihelion dist = 2.9995471896 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 60615.89676529 TDT (2024 Nov 01.8968) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292023Apr24,3.60,2024,11,1,21.522369,0.005734,0.041504,21.177316,-3.158524,0.004282,0.000602,-0.000001,0.000000 -98.9639,-13.2210,-146.94,-14.80,False UCAC4 384-086043,17.67895524,-13.2081358,12.29,11.99,11.83,0.0,0,,17.70198869,-13.2209964,2.75,2.49,0,0,0 489,Comacina,14.65,136.556,3.7801,0,0,3.374,-7.34,,7.6,0 0,97.2720,2024,11,1,8.3477,166.6826,12.9912,0.04852,3.15251,2.99955,8.49,5.0,0.15 1.078,0.0133,0.0037,93,0.0039,Known errors,1.35,0,-1,-1 20241101_086043,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org