| NGC 6505 | |
|---|---|
 NGC 6505 imaged byEuclid, withLEDA 2678036 (lower left) andLEDA 2678425 (upper right) | |
| Observation data (J2000epoch) | |
| Constellation | Draco |
| Right ascension | 17h 51m 07.4726s[1] |
| Declination | +65° 31′ 50.925″[1] |
| Redshift | 0.042414 ± 0.0000160[1] |
| Heliocentric radial velocity | 12,715±5 km/s[1] |
| Distance | 186.55 ± 13.06 Mpc (608.4 ± 42.6 Mly)[1] |
| Apparent magnitude (V) | 14.6[2] |
| Apparent magnitude (B) | 15.6[2] |
| Surface brightness | 14.8 |
| Characteristics | |
| Type | E-S0[2] |
| Size | ~243,300 ly (74.59 kpc) (estimated)[1] |
| Apparent size (V) | 1.1′ × 1.0′ |
| Other designations | |
| 2MASX J17510740+6531507,UGC 11026,MCG +11-22-007,PGC 60995,CGCG 322-018 | |
NGC 6505 is anelliptical galaxy withHubble sequence classification E/S0 in thenorthern celestial hemisphere constellationDraco. It is about 608 million light years away from theMilky Way galaxy and has a diameter of about 190,000light years. It was discovered on June 27, 1884 byLewis A. Swift.[3] In 2025, theEuclid Space Telescope found a completeEinstein ring surrounding NGC 6505.[4]
With the help of thelens model some properties of the central region of NGC 6505 were estimated. One result is that the central region has aninitial mass function that is heavier than predicted with Chabrier and adark matter fraction of11.1+5.4
−3.5 % inside the Einstein radius.[5]
Agravitational lens was discovered by Euclid Archive ScientistBruno Altieri in data fromESA'sEuclid telescope. The researchers therefore suggest the nickname "Altieri's lens". The discovery was made with early testing data from September 2023, which was out of focus. Later Euclid imaged the galaxy and the lensed galaxy with both the VIS and NIS instruments. The lens was also observed with resolved spectroscopy of theKeck Cosmic Web Imager (KCWI) and theDark Energy Spectroscopic Instrument (DESI). The lensed galaxy has a redshift of 0.4058 ± 0.003, equivalent to a distance of 4.46 billionlight-years.[5][6]
The discoverers called the discovery an "exceptionally rare strong lens" and the first gravitational lens found in anyNGC galaxy.[5]
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