Date: 12/07/2016 18:33:50
From: CrazyNeutrino
ID: 922639
Subject: Astronomers just discovered a new dwarf planet

Astronomers just discovered a new dwarf planet beyond Neptune

An international team of astronomers has announced the discovery of a new dwarf planet in our Solar System, finding a distant object beyond Neptune that circles the Sun in a spectacularly wide orbit.

Dubbed 2015 RR245 by the International Astronomical Union while they come up with a better name, the dwarf planet is about 700 kilometres in diameter, and its elongated orbit sends it out some 120 times further from the Sun than Earth. So it’s a pretty distant neighbour.

more…

Reply Quote
Date: 12/07/2016 18:43:05
From: dv
ID: 922651
Subject: re: Astronomers just discovered a new dwarf planet

Candidate, not confirmed.

Reply Quote
Date: 13/07/2016 15:59:42
From: mollwollfumble
ID: 923149
Subject: re: Astronomers just discovered a new dwarf planet

Just happened to be looking at this table earlier today.

Prov. Des. q Q H Epoch M Peri. Node Incl. e a Opps. Ref. Designation (and name) Discovery date, site and discoverer(s)

2016 LS 5.235 21.503 13.3 20160731 10.8 141.2 117.6 114.4 0.608 13.369 2 MPO381209 2016 LS 2016 06 01 F51 Pan-STARRS 1 2016 GZ251 10.208 25.753 11.1 20160731 34.1 85.8 37.3 29.3 0.432 17.981 2 MPO378471 2016 GZ251 2016 04 01 F51 Pan-STARRS 1 2016 GC241 13.785 29.530 10.6 20160313 14.1 180.0 330.2 4.2 0.363 21.657 ( 28d) MPO377978 2016 GC241 2016 04 01 F51 Pan-STARRS 1 2016 GR206 16.807 78.982 9.9 20160402 0.1 78.5 98.1 14.3 0.649 47.894 ( 6d) MPO377974 2016 GR206 2016 04 04 G96 Mt. Lemmon Survey 2016 FL59 20.574 2454 6.9 20160402 359.8 1.5 275.1 6.9 0.983 1237 ( 34d) MPO380426 2016 FL59 2016 03 28 W84 DECam 2016 FD14 10.606 31.328 12.6 20160313 359.9 328.9 215.8 20.3 0.494 20.967 ( 4d) MPO377935 2016 FD14 2016 03 28 W84 DECam 2016 FH13 9.453 40.366 10.2 20160731 6.5 306.7 176.3 93.6 0.620 24.909 ( 14d) MPO378405 2016 FH13 2016 03 29 F51 Pan-STARRS 1 2016 EB195 8.022 21.859 12.0 20160402 4.9 92.2 59.4 20.8 0.463 14.941 ( 47d) MPO380421 2016 EB195 2016 03 13 F51 Pan-STARRS 1 2016 EX 6.027 9.267 12.6 20160731 325.4 155.1 75.9 6.1 0.212 7.647 3 MPO374554 2016 EX 2016 03 01 F51 Pan-STARRS 1 2016 AE193 16.524 45.837 8.0 20160731 4.7 171.5 292.4 10.3 0.470 31.181 9 MPO365058 2016 AE193 2016 01 14 691 Spacewatch 2015 VV1 8.177 38.797 11.8 20160731 9.2 245.8 130.1 17.1 0.652 23.487 ( 41d) E2016-M06 2015 VV1 2015 11 02 F51 Pan-STARRS 1 2015 UH67 5.886 13.201 14.1 20151005 0.4 335.8 46.1 20.4 0.383 9.543 ( 4d) MPO357262 2015 UH67 2015 10 19 F51 Pan-STARRS 1 2015 TS350 5.054 280 13.2 20160731 0.5 277.0 38.3 58.1 0.965 142 ( 47d) MPO361290 2015 TS350 2015 10 15 F51 Pan-STARRS 1 2015 SO21 38.828 81.421 6.7 20150915 325.0 255.0 146.8 22.5 0.354 60.124 ( 3d) MPO369267 2015 SO21 2015 09 17 Z79 Calar Alto TNO Survey 2015 SV20 26.605 85.713 7.7 20151005 11.9 283.4 59.2 6.2 0.526 56.159 ( 48d) MPO357236 2015 SV20 2015 09 20 Z79 Calar Alto TNO Survey 2015 SO20 33.164 291 6.4 20160731 359.8 354.9 33.6 23.4 0.795 162 4 MPO358306 2015 SO20 2015 09 20 Z79 Calar Alto TNO Survey 2015 RR245 33.713 129 3.8 20160731 322.5 261.4 211.7 7.6 0.585 81.289 2 E2016-N67 2015 RR245 2015 09 09 568

See how 2015 RR245 has absolute visual magnitude H = 3.8, meaning that it’s big.

But another object found earlier the same year 2015 KH162 has magnitude H = 3.9, almost exactly the same, so it looks like either both are dwarf planets or neither.

Let’s look a bit further, among other SDOs. Magnitudes.
Eris is -1.2 is a recognised dwarf planet.
Sedna is is 1.6 is “almost certainly” a dwarf planet.
2007 OR10 is 2.5 this is considered “almost certainly” a dwarf planet.
2013 FY27 is 3.0 has an estimated diameter of 780 km, is “highly likely”.
There are two at 3.5
There are two others at 3.8

Reply Quote
Date: 13/07/2016 16:10:54
From: mollwollfumble
ID: 923156
Subject: re: Astronomers just discovered a new dwarf planet

Hmm, that table didn’t display well. For other candidates see

https://en.m.wikipedia.org/wiki/List_of_possible_dwarf_planets
Some of these have magnitudes well beyond 3.8.
See how 2015 RR245 sits in the table right next to well-known Ixion.
Position in table suggests that it’s approximately the 22 largest dwarf planet candidate.

Reply Quote
Date: 13/07/2016 17:32:29
From: btm
ID: 923178
Subject: re: Astronomers just discovered a new dwarf planet

Try this:
mollwollfumble said:


Just happened to be looking at this table earlier today.





















Prov. Des. q Q H Epoch M Peri. NodeIncl. e a Opps. Ref. Designation (and name)Discovery date, site and discoverer(s)
2016 LS 5.235 21.503 13.32016073110.8 141.2 117.6 114.40.60813.3692 MPO381209 2016 LS 2016 06 01 F51 Pan-STARRS 1
2016 GZ251 10.208 25.753 11.12016073134.1 85.8 37.3 29.3 0.43217.9812 MPO378471 2016 GZ251 2016 04 01 F51 Pan-STARRS 1
2016 GC241 13.785 29.530 10.62016031314.1 180.0 330.2 4.2 0.36321.657(28d)MPO377978 2016 GC241 2016 04 01 F51 Pan-STARRS 1
2016 GR206 16.807 78.982 9.9 201604020.1 78.5 98.1 14.3 0.64947.894(6d) MPO377974 2016 GR206 2016 04 04 G96 Mt. Lemmon Survey
2016 FL59 20.574 2454 6.9 20160402359.81.5 275.1 6.9 0.9831237 (34d)MPO380426 2016 FL59 2016 03 28 W84 DECam
2016 FD14 10.606 31.328 12.620160313359.9328.9 215.8 20.3 0.49420.967(4d) MPO377935 2016 FD14 2016 03 28 W84 DECam
2016 FH13 9.453 40.366 10.2201607316.5 306.7 176.3 93.6 0.62024.909(14d)MPO378405 2016 FH13 2016 03 29 F51 Pan-STARRS
2016 EB195 8.022 21.859 12.0201604024.9 92.2 59.4 20.8 0.46314.941(47d)MPO380421 2016 EB195 2016 03 13 F51 Pan-STARRS 1
2016 EX 6.027 9.267 12.620160731325.4155.1 75.9 6.1 0.2127.647 3 MPO374554 2016 EX 2016 03 01 F51 Pan-STARRS 1
2016 AE193 16.524 45.837 8.0 201607314.7 171.5 292.4 10.3 0.47031.1819 MPO365058 2016 AE193 2016 01 14 691 Spacewatch
2015 VV1 8.177 38.797 11.8201607319.2 245.8 130.1 17.1 0.65223.487(41d)E2016-M06 2015 VV1 2015 11 02 F51 Pan-STARRS 1
2015 UH67 5.886 13.201 14.1201510050.4 335.8 46.1 20.4 0.3839.543 (4d) MPO357262 2015 UH67 2015 10 19 F51 Pan-STARRS 1
2015 TS350 5.054 280 13.2201607310.5 277.0 38.3 58.1 0.965142 (47d)MPO361290 2015 TS350 2015 10 15 F51 Pan-STARRS 1
2015 SO21 38.828 81.421 6.7 20150915325.0255.0 146.8 22.5 0.35460.124(3d) MPO369267 2015 SO21 2015 09 17 Z79 Calar Alto TNO Survey
2015 SV20 26.605 85.713 7.7 2015100511.9 283.4 59.2 6.2 0.52656.159(48d)MPO357236 2015 SV20 2015 09 20 Z79 Calar Alto TNO Survey
2015 SO20 33.164 291 6.4 20160731359.8354.9 33.6 23.4 0.795162 4 MPO358306 2015 SO20 2015 09 20 Z79 Calar Alto TNO Survey
2015 RR245 33.713 129 3.8 20160731322.5261.4 211.7 7.6 0.58581.2892 E2016-N67 2015 RR245 2015 09 09 568

See how 2015 RR245 has absolute visual magnitude H = 3.8, meaning that it’s big.

But another object found earlier the same year 2015 KH162 has magnitude H = 3.9, almost exactly the same, so it looks like either both are dwarf planets or neither.

Let’s look a bit further, among other SDOs. Magnitudes.
Eris is -1.2 is a recognised dwarf planet.
Sedna is is 1.6 is “almost certainly” a dwarf planet.
2007 OR10 is 2.5 this is considered “almost certainly” a dwarf planet.
2013 FY27 is 3.0 has an estimated diameter of 780 km, is “highly likely”.
There are two at 3.5
There are two others at 3.8

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