Current and Future Activities
ofKaVA/EAVN Astrometry sub-WG

Nobuyuki Sakai (KASI) on behalf of GA sub-WG,
September 26th(Thur), 2019@Ibaraki University, Japan1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

Today’s contents
1.

Members of Galactic Astrometry sub-WG

2.

Previous activity- KaVA QSO pair astrometry- KaVA maser (line) astrometry- KaVA Geodesy- Atmospheric calibrations

3.

Future activity- EAVN QSO pair astrometry- EAVN maser (line) astrometry- EAVN Geodesy- Possible Science cases/Large programs

2/18

Technicaltalk
Sciencetalk1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

Core and New (?) members

3/18

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Number of proposals for EAVN/KaVA(C)Daniel Verschatse NGC6744

KaVA Astrometry
EAVN Open

4/18

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KaVA Phase-Referencing Open(C)DanielVerschatse NGC6744
Phase-referencing
with KaVA

Target: 0556+238 with SN = 24
PR: 0601+245

Open from 2019A
Lead Analyzer: Shuangjing

5/18

Phase-referencing with VERA

Target: 0556+238 with SN = 19
PR: 0601+245

Ref: KaVA Status report1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

KaVA Astrometry (Parallax) Open

6/18

(C)Daniel Verschatse NGC6744

Open from 2019B, Lead Analyzer: D. Sakai

Made by D. Sakai

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KaVA Geodesy: 2015 Jan～2018 June(C)Daniel Verschatse NGC6744

KVN Yonsei

📡 Roughly linear motions
📡 mm-level accuracy

7/18

KVN Ulsan

Estimated by T. Jike-san

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Water Vapor Radiometer

8/18(C)Daniel Verschatse NGC6744

The WVR on the VERA 20m
Kawaguchi-sanJapanese WVRRadio
astronomyreceiver(22GHz)

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Japan Meteorological Agency data

9/18(C)Daniel Verschatse NGC6744

Tianma 65m(Local Forecast Model)
OUTLINE OF THE OPERATIONALNUMERICAL WEATHER PREDICTION AT
THE JAPAN METEOROLOGICAL AGENCY(March 2019)

Tropospheric zenith delay of Ishigakijima station, estimated with JMA data.
Estimated by Y. Tamura-san

1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

Today’s contents
1.

Members of Galactic Astrometry sub-WG

2.

Previous activity- KaVA QSO pair astrometry- KaVA maser (line) astrometry- KaVA Geodesy- Atmospheric calibrations

3.

Future activity- EAVN QSO pair astrometry- EAVN maser (line) astrometry- EAVN Geodesy- Possible Science cases/
Large programs

Technicaltalk
Sciencetalk1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

EAVN QSO pair astrometry

10/18(C)Daniel Verschatse NGC6744

EAVN
Open from 2020B (planned)
Lead Analyzer: Shuangjing

Given by Shuangjing Xu

1. Menu 2. Member 3. KaVA 4. EAVN 5. Summary

EAVN maser astrometry(C)Daniel observation
Verschatsedates
NGC6744
Requested(within +/- 2 weeks):

Position offset (mas)

c0.5

11/18

East-0.5

North

-1.5
2020

Open from 2021B (planned)
Lead Analyzer: D. Sakai

2021
Years

Parallax phase for W3OH.
Red circle = offset in R.A. (mas),
Green 〃 = 〃Decl (mas).

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EAVN geodesy

12/18(C)Daniel Verschatse NGC6744

Made by Shuangjing Xu

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Possible EAVN large programs

13/18(C)Daniel Verschatse NGC6744

Credit: ReidSun et al. 2017
Made by Bo Zhang

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Possible EAVN large programs

14/18(C)DanielVerschatse NGC6744
VLBIprojects• VLBA:
Yang et al. 2017A.
G040.28+1.14 (<0.5Jy, failed)• EAVN:
Sakai et al. 2019B. G034.84+00.94

GA sub-WG(> 25 Jy, approved)• VLBA:
Bian et al. 2020A. G034.84+00.94(> 25 Jy, under review)Sun et al. 2018

Another possible candidate:
G040.96+2.48 H2O: ~1 Jy @ 22 GHz

Made by Bo Zhang

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EAVN astrometric science ①

15/18(C)Daniel Verschatse NGC6744

Accepted by 2019B
1st observation is on Sep 26th !

Given by Junghwan Oh

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EAVN astrometric science ②(C)Daniel Verschatse NGC6744

16/18

SiO maser survey towards Halo AGBs
that may trace Sgr. Stellar StreamWu, Matsunaga, Burns & Zhang 2018

Given by Yuanwei Wu

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EAVN astrometric science ③～⑪(C)Daniel Verschatse NGC6744

Oral presentation

Gaia vs. VLBI
Central Molecular Zone
Symbiotic star

Geodesy (VGOS)

Binary star

Poster presentation

AGB study
Galactic structure
Ionospheric calibration

MicroQSO

17/18

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VERA→KaVA→EAVN astrometry

18/18

VERA (Open from 2004)(c)NAOJKaVA (2019B~)

EAVN (2021B?)(c)NAOJ/KASI/You Inc.

~x2 Sensitivity
Short baselines(< 500 km)~x5 Sensitivity~x2 Parallax accuracy

Thankfor yourThis
isyou
nottheattention!
end.
It is not even thebeginning of the end.
But it is, perhaps,theend of the beginning.

by Sir Winston Churchill(c)Miyaji-san19