symaski62

les Observations TESS    =>  https://tess.mit.edu/observations/

1 an  les secteurs 1 à 13

2 ans  les secteurs 14 à 26

3 ans  les secteurs 27 à 39

05 55 10.30536 +07 24 25.4304 (Optical)

AAVSO 0549+07  et   HIP 27989  

(385446) Manwë-Thorondor

diameter 190 km

https://arxiv.org/abs/1911.08546

WOW !  TIC 185336364   Sector 15

C/2019 Q4 (Borisov) =  2I/Borisov

https://www.projectpluto.com/temp/gb00234.htm

q 2.008367322 +/- 0.00303

e 3.36398165 +/- 0.0139

461 of 577 observations 2019 Aug. 30-Sept. 24; mean residual 0".550

https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2019 Q4;old=0;orb=1;cov=0;log=0;cad=0#orb

q    1.99717336375388

e    3.314321521681457

 first obs. used     2019-08-30,   last obs. used     2019-09-27

http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=C%2F2019+Q4

eccentricity  3.3835756

perihelion distance (AU)  2.0126273

574 total observations over interval: 2019 08 30.04398 – 2019 09 24.14251

loin eccentricity  3.31 à  3.38   🤔    moyen   3.345

https://photojournal.jpl.nasa.gov/catalog/PIA23437

https://arxiv.org/abs/1909.09158

Searching for a cometary belt around Trappist-1 with ALMA

(mise à jour)

MPC (IAU)

447 total observations over interval: 2019 08 30.04398 – 2019 09 20.166194

eccentricity 3.3892848

perihelion distance (AU) 2.0140361

-----------------------------------

JPL

   first obs. used     2019-08-30  

   last obs. used     2019-09-20  

eccentricity 3.445224326645891

perihelion distance (AU)  2.027619646107458

----------------------------------

moyen  

eccentricity 3.41

perihelion distance (AU) 2.0205

TIC 185336364   Sector 14    

mise à jour  

IAU  MPC

305 total observations over interval: 2019 08 30.04398 – 2019 09 16.18422

eccentricity 3.4315836

perihelion distance (AU) 2.0244417

-------------------------

JPL

first obs. used     2019-08-30  

last obs. used     2019-09-16  

eccentricity  3.671315408428195

perihelion distance (AU)  2.078691392377223

mise à jour  

M1=  6.       M2=  n.a.     k1=  6.     k2= n.a.     PHCOF= n.a.

m1 = 1.0 + 5 log d + 10.0 log r   (bleu)  =>  total

m1 = 6 + 5 log d + 6 log r  (rouge) => noyau 

https://www.projectpluto.com/temp/gb00234.htm

OOOF     calculer  simulation  ?

Orbital elements:  C/2019 Q4
   Perihelion 2019 Dec 7.523918 +/- 0.49 TT = 12:34:26 (JD 2458825.023918)
Epoch 2019 Sep 13.0 TT = JDT 2458739.5   Ju: 0.8486           Gray
q   2.0497402180 +/- 0.0209         (J2000 ecliptic)
M(N) 10.6  K 10.0                   Peri.  208.1472783 +/- 0.43
                                    Node   308.5238180 +/- 0.18
e   3.538778351 +/- 0.0973          Incl.   43.6690557 +/- 0.18
204 of 226 observations 2019 Aug. 30-Sept. 13; mean residual 0".566

http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=C%2F2019+Q4

Citation

226 total observations over interval: 2019 08 30.04398 – 2019 09 13.42520

eccentricity => 3.2078726

perihelion distance (AU) => 1.9715486

https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2019 Q4;old=0;orb=1;cov=0;log=0;cad=0#orb

Citation

 

first obs. used     2019-08-30  

last obs. used     2019-09-13  

 

eccentricity => 3.70429496893662

perihelion distance (AU) => 2.08596458569878

calculer  simulation  ?    IAU  vs  JPL

https://arxiv.org/abs/1908.10286

A Dearth of Small Members in the Haumea Family Revealed by the OSSOS Survey

2013 UQ15

https://arxiv.org/abs/1907.10077

Active asteroid (6478) Gault: a blue Q-type surface below the dust ?

quoi ?  

https://www.aavso.org/aavso-alert-notice-672

TIC 185336364 =>  KIC 8462852 (Tabby's Star)

https://exofop.ipac.caltech.edu/tess/target.php?id=185336364

https://arxiv.org/abs/1906.10195

We also found a rotational period Prot = 3.360+-0.005 h and show evidence that 6478 might be double.

pardon  jamais vu   Teegarden’s Star

https://arxiv.org/pdf/1906.07196.pdf

However, even if RVs turn out to be much more sensitive to stellar variability and 
one period is connected to stellar rotation, then at least the other signal should 
be a planet. Period ratios of 2:1 can be caused by the harmonics of stellar rotation 
(but also eccentric and resonant planets). However, the period ratio is Pc/Pb = 2.32,
which is close to but noticeably different from 2:1. Such a discrepancy is hard to explain
even with differential rotation, while departures from exact 2:1 ratios are often observed
in exoplanet systems

2:1  Résonance orbitale à 2 planètes   confirme 

nom : Teegarden's   12 light years =  3.831 (± 0.004) pc  

2 planètes !  

http://exoplanet.eu/catalog/teegarden's_b/   =>  5 jours

http://exoplanet.eu/catalog/teegarden's_c/  => 11.4 jours  

wow !

http://exoplanet.eu/catalog/51_Eri_b/

Planet 51 Eri b   

https://arxiv.org/abs/1906.02071

Colors of Trans-Neptunian Contact Binaries

je regarde l'étoile, Les satellites #Starlink 60

28/05/2019, 23h36 à 23h52 CET l'oeil nu

Starlink -1 ou -2 mag (moins 1 sec)  brille ! 

https://www.heavens-above.com/main.aspx

Les satellites Starlink
Les satellites Starlink récemment lancés sont encore relativement proches les uns des autres et il est possible de les voir comme une enfilade de 60 satellites. Ils ne sont pas encore tous identifiés mais nous incluons des liens ci-après concernant les prédictions du premier et du dernier satellite. Celui de tête semble être en avance de quelques minutes par rapport à l'ensemble principal mais beaucoup de personnes ont relaté qu'ils pouvaient être vus à l'oeil nu et offrent une vue spectaculaire.

Starlink (premier)  <=  début

Starlink (dernier) <=  fin