The Total Lunar Eclipse of 2007 March 3rd
Danjon scale
estimates
A total of 45 estimates have been received. Although the range of
variation is from 0.5 (exceptionally dark) to 4 (exceptionally bright) 35 of
the 45 estimates (78%) are in the range L=2-3. Both the mean and the median of
the 45 estimates give L=2.5(+/-0.8), indicating that this was a quite bright
eclipse. Slightly more estimates (17 against 11) estimated L=3 than estimated
L=2, with 7 giving L=2.5. There is no significant trend towards people giving a
brighter estimate away from mid-eclipse.
|
Observer |
Location |
UT |
Danjon
L |
|
Arregui,
M. |
Basque
Country |
|
2.0 |
|
Barcelo,
J. |
|
|
3.0 |
|
Beech,
John |
Maidenhead |
23.10 |
2.5 |
|
Beech,
John |
Maidenhead |
23.30 |
3.0 |
|
Beech,
John |
Maidenhead |
23.59 |
3.0 |
|
Benavides,
Rafael |
|
|
3.0 |
|
Bieda,
Richard |
|
22.55 |
2.0 |
|
Bieda,
Richard |
|
23.35 |
2.0 |
|
Bieda,
Richard |
|
23.58 |
3.0 |
|
Bristol
A.S. (13 members) |
|
|
3.0 |
|
Browning,
Don |
|
22.50 |
3.0 |
|
Browning,
Don |
|
23.20 |
3.0 |
|
Campas,
M. |
|
|
1.5 |
|
Campin,
Richard |
Cookham
Dean |
23.25 |
3.0 |
|
Glover,
Caroline |
Petersfield |
22.45 |
2.5 |
|
Glover,
Caroline |
Petersfield |
23.20 |
4.0 |
|
Glover,
Caroline |
Petersfield |
23.45 |
2.0 |
|
Henriquez-Santana,
J.A. |
|
|
2.5 |
|
Heybourn,
Bob |
|
23.20 |
1.5 |
|
Hurst,
Guy |
|
23.13 |
2.5 |
|
Hurst,
Guy |
|
23.36 |
3.0 |
|
Hurst,
Guy |
|
23.53 |
3.0 |
|
Kidger,
M. |
|
|
3.0 |
|
Kidger,
M. |
|
|
3.0 |
|
Labordena,
C. |
Castellon |
|
3.0 |
|
Lindon-Morris,
C |
|
22.44 |
1.0 |
|
Lindon-Morris,
C |
|
23.20 |
2.0 |
|
Lindon-Morris,
C |
|
23.57 |
1.0 |
|
Mansfield,
R. |
|
|
3.0 |
|
Ocaña, F. |
|
|
2.5 |
|
Parker,
Steve |
|
22.50 |
2.0 |
|
Parker,
Steve |
|
23.20 |
2.0 |
|
Pickard,
R. |
|
|
2.5 |
|
Pidduck,
Neil |
King's
Worthy |
22.44 |
2.0 |
|
Pidduck,
Neil |
King's
Worthy |
23.20 |
3.0 |
|
Pugh,
Roger |
Stubbings |
23.10 |
3.0 |
|
Robinson,
Mike |
|
23.20 |
2.0 |
|
Rowland,
Heidi |
Itchen |
22.45 |
2.0 |
|
Ryall,
Rosemary |
|
23.00 |
4.0 |
|
Sanchez,
A. |
|
|
2.5 |
|
Thiessen,
Heiner |
Petersfield |
23.20 |
2.0 |
|
Tivey,
David |
Fordingbridge |
22.50 |
1.0 |
|
Tivey,
David |
Fordingbridge |
23.15 |
0.5 |
|
Torrell,
S. |
|
|
1.5 |
|
Turner,
Malcolm |
Maidenhead |
23.21 |
4.0 |
Guy
Hurst adds:
Various
students in my astronomy classes have reported Danjon estimates, mostly their
first attempts, as part of an exercise circulated just prior to the eclipse
with details of the usual descriptions for 0-4. Several commented on the
remarkable spherical/3D impression of the Moon caused by the various colours
involved. Guy also supplied the following light curve of Danjon estimates
against time from his group.
Roger
Pickard:
About L2+ (i.e. veering towards L3) on the Danjon scale. Carlos
Labordena:
I would rate it a 3 on the Danjon
Scale. It was bright, but not bright enough to be a 4.
Montse
Campas and son (Ramon Naves Jr.) :
From here we would also rate it
between 1 and 2, but we world put it closer to a 2. It did not seem so bright to me. I can recall
one that I did not enjoy at all that was so bright and the Moon was so clearly
visible that it did not look like an eclipse at all – only the colour was
eclipse-like.
Mark Kidger:
Orange
umbra with a lot of detail visible in it. Bright yellow ring to edge of umbra.
Danjon 3.
When all
45 values are plotted against time the result is the following plot:
The
graph shows that there is no evidence that the estimated Danjon value varied
with time during the eclipse.