Common Name:	S4 1800+44	MOJAVE 15 GHz [Total intensity movie]   | [Polariz. movie]	VLBA 1.4 GHz: University College Cork Program
B1950 Name:	1800+440
J2000 Name:	J1801+4404
R.A. and Dec. (J2000):	18h1m32.315s +44d4'21.900"
AGN Class:	LSP HPQ
Redshift:	0.663 (1982MNRAS.200..191W)
Luminosity Distance:	3984 Mpc ; 6.98 pc/mas
Radio Spectrum:	Flat
Gamma-ray Association	LAT: Y, EGRET: N, TeV: N
Kpc-scale morphology:	Two-sided
Jet Speed:	Maximum: 444 ± 38 μas/y ; 16.8 ± 1.4 c Median: 395 ± 28 μas/y ; 14.9 ± 1.0 c based on 5 moving features Lister et al. 2021, ApJ,923,30
Separation Versus Time Plot:	PNG    PS
Stacked epoch 15 GHz VLBA images: Uniform weight: [PDF]   [GIF] Natural weight: [PDF]   [GIF] Circular Beam : [PDF]   [GIF] Tapered Beam: [PDF]   [GIF] Pushkarev et al. 2017 :   FITS Rotation Measure Map: | 2006_04_28 | Spectral Index Map: | 2006_04_28 | Multifrequency MOJAVE VLBA Data: Epoch 8.1 GHz 8.4 GHz 12.1 GHz 2006-04-28 uvf   uvf   uvf   Univ. College Cork VLBA L Band Data: Epoch 1.35 GHz 1.4 GHz 1.5 GHz 1.7 GHz 2010-03-07 uvf   uvf		VLBA 23 GHz: RRIFD Database	Kpc-scale: Reid et al. 1995, AASup, 110,213
Fermi LAT and 15 GHz VLBA Light Curves		VLBA 43 GHz: Cheng et al. 2020	Multiepoch Radio Spectrum:
Comments:	MOJAVE 1.5 Jy source

If you use these data in a publication, we ask that you please contact us so we can add a link to the list of external MOJAVE publications, and ask that you cite Lister et al., 2018, ApJS, 234, 12 and include the following acknowledgment: "This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2018)"

Important Note: The MOJAVE team, working with the OVRO 40m AGN monitoring group, discovered a systematic error in the flux densities of all VLBA 15 GHz observations taking place after a date that lies between 2019 April 16 and 2019 May 16. Observations after that date have correlated flux densities that are between 10% and 20% too low. We have adjusted the flux density scaling of the MOJAVE VLBA data up to 2022 Jan 3 based on near-simultaneous OVRO 40m measurements at 15 GHz.

Asterisked entries below denote epochs that have not yet been corrected for the VLBA flux density scaling problem.

Epoch (Y-M-D)	VLBA Code	VLBA I (mJy)	VLBA P (mJy)	VLBA P (%)	VLBA EVPA (deg.)	I Image (Nat. Weight)	Tapered I Image	Tapered I Image (Widefield)	Visibility Data	Stokes I Radplot	Pol. Image
2013-08-20	BL178BI	779	18	2.3	122	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2013-05-05	BL178BC	840	15	1.8	104	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2012-11-21	BL178AT	928	20	2.1	126	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2012-08-03	BL178AN	640	27	4.2	122	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2011-03-05	BL149DD	506	8.7	1.7	5	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2009-12-17	BL149CE	964	23	2.4	133	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2008-08-25	BL149BB	1317	43	3.3	41	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2007-03-28	BL137P	1736	20	1.1	30	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2006-04-28	BL137D	1379	39	2.8	101	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2005-03-05	BL123C	656	25	3.8	114	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2004-12-02	BL111Q	760	19	2.4	110	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2004-08-09	BL111N	1300	22	1.7	122	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2003-03-29	BL111G	1166	10	0.9	49	FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS	PNG   PS
2001-12-30	BR077H	1044	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS
2000-12-28	BK068F	637	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS
1999-01-02	BG077D	760	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS
1997-03-13	BK048B	1191	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS
1996-05-16	BK037B	1480	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS
1995-04-07	BK016	969	no data			FITS   PNG   PS	FITS   PNG   PS	PNG   PS	uvf	PNG   PS

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