Nebula        M27      M57      M76      M97
NGC           6853     6720     650-1    3587

Ours-New      1.25     2.3      2.5      2.6
Ours-Old      1.25     4.1      3.4      2.6

O'D62         0.85     2.20     1.75     1.62
Hynes         0.8
Ma84          1.3      2.28
Cahn92        0.854    2.84     2.41     2.00
VdS94         1.3      3.26     4.24     3.88
Po96          1.17     1.63     2.35     1.79
Ha97          1.24     2.30
Ph2002        1.17     1.96     2.54     1.39
Fr2016        1.32     2.41     3.03     2.84
NOAO          0.85     3.00     2.50     2
SIMBAD        0.86     2.87     2.43     2.02

O'D62

Charles Robert O'Dell, 1962. A distance Scale for Planetary Nebulae Based on Emission-Line Fluxes. Astrophysical Journal, vol. 135, pp. 371-384 (03/1962) [ADS: 1962ApJ...135..371O]

Ma84

Maciel W., 1984. A catalogue of distances of planetary nebulae. Astronomy and Astrophysics Suppl., Vol. 55, p. 253 [ADS: 1984A&AS...55..253M].

Cahn92

Cahn, J. H.; Kaler, J. B.; Stanghellini, L., 1992. A catalogue of absolute fluxes and distances of planetary nebulae. Astronomy and Astrophysics Supplement Series, vol. 94, no. 3, Sept. 1992, pp. 399-452 [ADS: 1992A&AS...94..399C].

VdS94

Van De Steene, G., Zijlstra A., 1994. On an alternative statistical distance scale for planetary nebulae. Catalog with statistical distances to planetary nebulae. Astronomy and Astrophysics Suppl., Vol. 108, pp. 485-490 (12/1994) [ADS: 1994A&AS..108..485V].

Po96

Pottasch, S.R., 1996. Local space density and formation rate of planetary nebulae. Astronomy and Astrophysics, 307, pp. 561-578 [ADS: 1996A&A...307..561P].

Ha97

Harris, H.C., Dahn, C.C., Monet, D.G., and Pier, J.R., 1997. Trigonometric parallaxes of Planetary Nebulae. In H.J. Habing and H.J.G.L.M. Lamers (eds.), Planetary Nebulae. IAU Symposium No. 180, pp. 40-45 [ADS: 1997IAUS..180...40H].

Ph2002

J.P. Phillips, 2002. The Distances of Planetary Nebulae: A Scale Based upon Nearby Sources. Astrophysical Journal Supplement Series, Volume 139, Issue 1, pp. 199-217 (3/2002) [ADS: 2002ApJS..139..199P]

Fr2016

David J. Frew, Q.A. Parker, and I.S. Bojicic, 2016. The H alpha surface brightness-radius relation: a robust statistical distance indicator for planetary nebulae. Monthly Notices of the Royal Astronomical Society, Volume 455, Issue 2, pp. 1459-1488 (01/2016) [ADS: 2016MNRAS.455.1459F] -- [Preprint: arXiv:1504.01534]

NOAO

N.A. Sharp et.al.. NOAO Website

SIMBAD

SIMBAD Astronomical Database -- CDS (Strasbourg)