Dr. Nick Attree
@nickattree.bsky.social
Planetary scientist @iaacsic.bsky.social, working on @esa.int's Rosetta & @cometinterceptor.bsky.social. Prev @TUBraunschweig, @LAM, @QMUL & @UoLeicester 🇬🇧🇪🇸🇪🇺
https://sites.google.com/view/nickattree
ORCID: 0000-0003-3344-6693
https://sites.google.com/view/nickattree
ORCID: 0000-0003-3344-6693
The good news just keeps on coming doesn't it 🥲
November 11, 2025 at 3:57 PM
The good news just keeps on coming doesn't it 🥲
I do like that! And from Rosetta too :)
November 10, 2025 at 3:29 PM
I do like that! And from Rosetta too :)
school trip flashbacks ahh!
November 10, 2025 at 10:22 AM
school trip flashbacks ahh!
Appropriate bsky.app/profile/hour...
Saturn's rings 11, April 2014 W00088236-38 (red, grn, bl1) - From 2di7 & titanio44 - https://flic.kr/p/n3FsGp
November 6, 2025 at 9:04 PM
Appropriate bsky.app/profile/hour...
The paper I referenced I actually found by accident looking for the one you referenced 😅
November 5, 2025 at 10:27 PM
The paper I referenced I actually found by accident looking for the one you referenced 😅
The thread I linked to earlier has a good explanation that people seem to have found helpful.
bsky.app/profile/eric...
bsky.app/profile/eric...
So the updated 3I/ATLAS orbit now included positions up to a couple days ago…
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
Small-Body Database Lookup
This website makes extensive use of JavaScript. The top menus will not function without it and most tools will also not work.
ssd.jpl.nasa.gov
November 5, 2025 at 5:20 PM
The thread I linked to earlier has a good explanation that people seem to have found helpful.
bsky.app/profile/eric...
bsky.app/profile/eric...
Oh, of course! 3I is a little bit weird, but all comets are weird (and probably not alien spacecraft)!
November 5, 2025 at 5:14 PM
Oh, of course! 3I is a little bit weird, but all comets are weird (and probably not alien spacecraft)!
also this paper relating NGA to outgassing/brightness. I'd have to check the numbers but I'm pretty sure both are within the normal kind of range for 3I academic.oup.com/mnras/articl...
Masses of long-period comets derived from non-gravitational effects – analysis of the computed results and the consistency and reliability of the non-gravitational parameters
Abstract. We estimate masses for a selected sample of long-period comets (LPCs) (with orbital periods P > 1000 yr and perihelion distances q < 2 au),
academic.oup.com
November 5, 2025 at 4:28 PM
also this paper relating NGA to outgassing/brightness. I'd have to check the numbers but I'm pretty sure both are within the normal kind of range for 3I academic.oup.com/mnras/articl...
I mean...we have already detected a coma and a tail...?
Such a small NGA will easily be consistent with observed coma. 1I had (I think?) more NGA without which was, of course, more difficult to explain.
This thread linked a paper with an eqn linking outgassing rate with NGA
bsky.app/profile/eric...
Such a small NGA will easily be consistent with observed coma. 1I had (I think?) more NGA without which was, of course, more difficult to explain.
This thread linked a paper with an eqn linking outgassing rate with NGA
bsky.app/profile/eric...
…long-period comets in our solar system (see eg Sekakina 2021 Fig 1 arxiv.org/pdf/2109.11120), the A1 is a bit high, but not extraordinary (and again, its a 3sigma measurement at this point)….
arxiv.org
November 5, 2025 at 4:21 PM
I mean...we have already detected a coma and a tail...?
Such a small NGA will easily be consistent with observed coma. 1I had (I think?) more NGA without which was, of course, more difficult to explain.
This thread linked a paper with an eqn linking outgassing rate with NGA
bsky.app/profile/eric...
Such a small NGA will easily be consistent with observed coma. 1I had (I think?) more NGA without which was, of course, more difficult to explain.
This thread linked a paper with an eqn linking outgassing rate with NGA
bsky.app/profile/eric...
Now actually over #Granada and the mighty #SierraNevada (original ones, for those in the US 😛)
November 3, 2025 at 5:18 PM
Now actually over #Granada and the mighty #SierraNevada (original ones, for those in the US 😛)
This is really coo. Yearly surface maps of another world from earth is really jumping the SHARK though!
November 3, 2025 at 4:03 PM
This is really coo. Yearly surface maps of another world from earth is really jumping the SHARK though!
Never heard of doing this before at home, but I haven't got a large extended family. Here in Spain tho, even our neighbour's son calls me 'tio' 😅
October 28, 2025 at 9:06 PM
Never heard of doing this before at home, but I haven't got a large extended family. Here in Spain tho, even our neighbour's son calls me 'tio' 😅
Day 2 of the SWT. I will shortly be presenting the work of my internship student, Pieter, on analysing trajectories of incoming comets ☄️
He's done some great work!
He's done some great work!
October 28, 2025 at 10:44 AM
Day 2 of the SWT. I will shortly be presenting the work of my internship student, Pieter, on analysing trajectories of incoming comets ☄️
He's done some great work!
He's done some great work!