IOTA/IOTA-ES occultation update for (1548) Palomaa / UCAC4 346-125668 event on 2024 Oct 30, 22:23 UT Visible from Summary ------- On 2024 Oct 30 UT, the 30.2030420989483 km diameter asteroid (1548) Palomaa will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.72 mag to 17.23 mag (the magnitude of the asteroid) for at most 0.840 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 Oct 30, 22:20 - 2024 Oct 30, 22:26 * geocentric midpoint of event [JD]: 2460614.43298596 * magnitude of target star: 11.52 * magnitude drop [mag]: 5.72 * estimated maximum duration [s]: 0.840 * Moon: 2 % sunlit, 70° distance * Sun: 53° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 105°) * approx speed of asteroid's shadow [km/s]: 36.2035 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 346-125668 by 1548 Palomaa on 2024 Oct 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 172 0 0 16 1 10 22 20 35.7 0 112 49 15 52 12 .. .. .. 15 48 56 .. .. .. .... 173 0 0 15 37 49 22 20 35.7 1 112 50 15 28 51 15 46 48 15 25 34 15 50 5 0.06 174 0 0 15 14 17 22 20 35.8 2 112 50 15 5 18 15 23 16 15 2 1 15 26 33 -0.04 175 0 0 14 50 33 22 20 35.9 3 113 51 14 41 33 14 59 33 14 38 16 15 2 50 -0.07 176 0 0 14 26 38 22 20 36.1 4 113 52 14 17 38 14 35 39 14 14 21 14 38 56 -0.09 177 0 0 14 2 34 22 20 36.4 5 113 53 13 53 33 14 11 34 13 50 16 14 14 52 -0.10 178 0 0 13 38 19 22 20 36.7 6 113 54 13 29 18 13 47 20 13 26 1 13 50 38 -0.10 179 0 0 13 13 56 22 20 37.1 7 114 55 13 4 54 13 22 57 13 1 37 13 26 15 -0.11 -180 0 0 12 49 24 22 20 37.6 8 114 56 12 40 22 12 58 25 12 37 4 13 1 43 -0.11 -179 0 0 12 24 43 22 20 38.1 9 114 57 12 15 41 12 33 45 12 12 24 12 37 3 -0.11 -178 0 0 11 59 56 22 20 38.6 11 114 58 11 50 53 12 8 58 11 47 35 12 12 16 -0.12 -177 0 0 11 35 1 22 20 39.3 12 114 59 11 25 58 11 44 4 11 22 40 11 47 22 -0.12 -176 0 0 11 10 0 22 20 40.0 13 115 60 11 0 57 11 19 3 10 57 39 11 22 21 -0.12 -175 0 0 10 44 53 22 20 40.7 14 115 61 10 35 50 10 53 56 10 32 32 10 57 15 -0.12 -174 0 0 10 19 41 22 20 41.5 15 115 62 10 10 38 10 28 45 10 7 20 10 32 3 -0.12 -173 0 0 9 54 25 22 20 42.4 16 115 62 9 45 22 10 3 28 9 42 4 10 6 47 -0.12 -172 0 0 9 29 5 22 20 43.4 17 115 63 9 20 1 9 38 8 9 16 43 9 41 27 -0.12 -171 0 0 9 3 41 22 20 44.4 18 116 64 8 54 38 9 12 45 8 51 20 9 16 3 -0.12 -170 0 0 8 38 15 22 20 45.4 19 116 65 8 29 12 8 47 19 8 25 53 8 50 37 -0.12 -169 0 0 8 12 47 22 20 46.5 20 116 66 8 3 43 8 21 50 8 0 25 8 25 9 -0.13 -168 0 0 7 47 17 22 20 47.7 21 116 66 7 38 14 7 56 21 7 34 56 7 59 39 -0.13 -167 0 0 7 21 47 22 20 49.0 22 116 67 7 12 44 7 30 50 7 9 25 7 34 9 -0.13 -166 0 0 6 56 16 22 20 50.3 23 116 68 6 47 13 7 5 20 6 43 55 7 8 38 -0.13 -165 0 0 6 30 47 22 20 51.6 24 117 69 6 21 44 6 39 50 6 18 25 6 43 8 -0.13 -164 0 0 6 5 18 22 20 53.1 26 117 69 5 56 15 6 14 21 5 52 57 6 17 40 -0.13 -163 0 0 5 39 51 22 20 54.6 27 117 70 5 30 49 5 48 54 5 27 30 5 52 13 -0.13 -162 0 0 5 14 27 22 20 56.1 28 117 70 5 5 25 5 23 30 5 2 7 5 26 48 -0.13 -161 0 0 4 49 6 22 20 57.7 29 117 71 4 40 4 4 58 9 4 36 46 5 1 27 -0.13 -160 0 0 4 23 49 22 20 59.4 30 117 71 4 14 47 4 32 51 4 11 29 4 36 9 -0.13 -159 0 0 3 58 36 22 21 1.1 31 117 72 3 49 34 4 7 38 3 46 16 4 10 56 -0.13 -158 0 0 3 33 28 22 21 2.8 32 117 72 3 24 27 3 42 30 3 21 9 3 45 48 -0.13 -157 0 0 3 8 26 22 21 4.7 33 118 73 2 59 25 3 17 28 2 56 8 3 20 45 -0.13 -156 0 0 2 43 31 22 21 6.5 34 118 73 2 34 30 2 52 32 2 31 12 2 55 49 -0.13 -155 0 0 2 18 42 22 21 8.5 35 118 73 2 9 42 2 27 42 2 6 24 2 31 0 -0.13 -154 0 0 1 54 1 22 21 10.4 36 118 73 1 45 1 2 3 1 1 41 44 2 6 18 -0.13 -153 0 0 1 29 28 22 21 12.5 37 118 73 1 20 28 1 38 28 1 17 12 1 41 45 -0.13 -152 0 0 1 5 4 22 21 14.5 39 118 73 0 56 5 1 14 3 0 52 48 1 17 20 -0.13 -151 0 0 0 40 49 22 21 16.7 40 118 73 0 31 50 0 49 48 0 28 34 0 53 4 -0.13 -150 0 0 0 16 44 22 21 18.8 41 118 73 0 7 46 0 25 42 0 4 30 0 28 59 -0.13 -149 0 0 - 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1 9 8 - 1 30 13 - 1 5 53 -0.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 346-125668 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 00 52.2170 DE: -20 56 45.377 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 00 52.2170 DE: -20 56 45.377 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.3 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1548) Palomaa asteroid class: approx. diameter [km]: 30 approx. diameter ["]: 0.013 distance from Earth [AU]: 3.22580 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.011", 0.002", 105.287° remarks: * orbital elements for (1548)Palomaa : Mean anomaly = 73.0319939932 deg Arg. of pericenter = 87.4385335999 deg Long. of node = 116.8905591611 deg Inclination = 16.5532672392 deg Eccentricity = 0.0815769280 Semimajor axis = 2.7876241452 AU Perihelion dist = 2.5602183311 AU Mag: H = 11.61, G = 0.15 Epoch of elements : MJD 60613.93298588 TDT (2024 Oct 30.9330) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.84,2024,10,30,22.391663,0.021400,0.137222,20.177138,-3.231370,0.004649,0.000173,-0.000001,0.000000 -105.0137,-20.9474,-159.97,-14.17,False UCAC4 346-125668,18.01450478,-20.9459380,12.32,11.52,11.09,0.1,0,,18.03892982,-20.9473691,5.72,5.70,0,0,0 1548,Palomaa,17.23,30.437,3.2258,0,0,3.927,-8.80,,1.4,0 0,72.8344,2024,10,30,87.4385,116.8906,16.5533,0.08158,2.78762,2.56022,11.61,5.0,0.15 1.183,0.0107,0.0021,105,0.0024,Known errors,1.04,0,-1,-1 20241030_125668,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org