3C 371

{{Short description|Active galaxy in the constellation Draco}}

{{Quasar

| name = 3C 371

| image = 3C-371-jet-O5GV07NEQ.gif

| caption = Hubble Legacy Archive Near-UV image of the jet coming out of 3C 371

| epoch = J2000

| ra = {{RA|18|06|50.681}}{{cite simbad

|title=3C 371

|access-date=2010-04-11}}

| dec = {{DEC|+69|49|28.11}}

| constellation name = Draco

| z = 0.051{{cite web

|title=NASA/IPAC Extragalactic Database

|work=Results for 3C 371

|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=3C+371&img_stamp=yes&extend=no

|access-date=2010-04-11 }}

| type = BL Lac
FRI RG

| dist_ly = 730 million light-years
224 Mpc{{cite web

|date=2008-01-11

|title=3C 371

|publisher=XJET: X-Ray Emission from Extragalactic Radio Jets

|url=http://hea-www.harvard.edu/XJET/source-d.cgi?3C_371

|access-date=2010-04-11}}

| appmag_v = 14.4 ±1.5

| size_v =

| notes =

| names = UGC 11130, PGC 61417, 2E 4023, 7C 180717.90+694858.00, QSO B1807+698

}}

3C 371 is a BL Lac object located in the constellation Draco. With a redshift of 0.051, this active galaxy is about 730 million light-years away.

3C 371 is a well known object, first associated with the BL Lac class by Miller in 1975,{{cite journal

|last=Perlin |first=Eric S.

|author2=Padgett

|author3=Georganopoulos

|author4=Sparks

|author5=Biretta

|title=Optical Polarimetry of the Jets of Nearby Radio Galaxies. I. The Data

|journal=The Astrophysical Journal

|volume=651 |issue=2 |pages=735–748 |date=2006

|bibcode=2006ApJ...651..735P

|doi=10.1086/506587|arxiv = astro-ph/0606119 |s2cid=53073859

|display-authors=etal}} and is among the nearest and brightest BL Lacs. Optical jet emission from 3C 371 was first detected in ground-based images by Nilsson et al. in 1997, and confirmed with HST (Scarpa et al.) in 1999. The implied viewing angle may be less than 18 degrees. But no superluminal motion has been detected, despite frequent monitoring by the Very Long Baseline Array (VLBA).

There are photos of this object dating back to 1895, and they suggest that this objects magnitude can vary by ±1.5.{{cite journal

|last=Usher |first=Peter D.

|author2=Manley, Oscar P.

|title=The Unusual Long-Term Behavior of 3c 371

|journal=Astrophysical Journal

|volume=151 |pages=L79–L82 |date=1968

|doi=10.1086/180147

|bibcode=1968ApJ...151L..79U|doi-access=free

}}