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Table 3
2MASS apparent and absolute magnitudes of V1721 Aql progenitor (candidate), colours, and de-reddened colours of the near-IR source located at the position of the nova.
| Filter | Apparent magnitude | Absolute magnitude | Colour | Value | De-reddened value |
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| J | 16.6 ± 0.2 | 1.8 ± 0.6 | J − Ks | 2.0 ± 0.2 | 0.1 ± 0.2 |
| H | 15.5 ± 0.1 | 1.7 ± 0.6 | J − H | 1.2 ± 0.2 | 0.0 ± 0.2 |
| K s | 14.7 ± 0.1 | 1.7 ± 0.6 | H − Ks | 0.8 ± 0.2 | 0.1 ± 0.2 |
Notes. The extinction towards the nova has been taken as AV = 11.6, and its distance as 2.2 kpc.
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