| Parameter |
Value |
| Designation |
C/1971 M1 (Edwards) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1971-12-07T23:04:58.232640Z |
| Orbit solution date (soln_date, UTC) |
2023-03-26T23:42:03Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1971-07-04.0000000 |
| e |
1.00000000 |
| q (au) |
2.881429 |
| a (au) |
- |
| i (deg) |
97.149236 |
| Ω (om, deg) |
267.776204 |
| ω (w, deg) |
44.179761 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
05:38:15.46 |
+01:23:48.4 |
HIP 26648 |
24.08 |
| 2026-03-26 12:00 |
05:38:15.71 |
+01:23:56.2 |
HIP 26648 |
23.99 |
| 2026-03-27 00:00 |
05:38:15.96 |
+01:24:04.1 |
HIP 26648 |
23.90 |
| 2026-03-27 12:00 |
05:38:16.24 |
+01:24:12.0 |
HIP 26648 |
23.80 |
| 2026-03-28 00:00 |
05:38:16.52 |
+01:24:19.8 |
HIP 26648 |
23.71 |
| 2026-03-28 12:00 |
05:38:16.82 |
+01:24:27.6 |
HIP 26648 |
23.60 |
| 2026-03-29 00:00 |
05:38:17.13 |
+01:24:35.4 |
HIP 26648 |
23.50 |
| 2026-03-29 12:00 |
05:38:17.45 |
+01:24:43.3 |
HIP 26648 |
23.40 |
| 2026-03-30 00:00 |
05:38:17.78 |
+01:24:51.0 |
HIP 26648 |
23.29 |
| 2026-03-30 12:00 |
05:38:18.13 |
+01:24:58.8 |
HIP 26648 |
23.18 |
| 2026-03-31 00:00 |
05:38:18.49 |
+01:25:06.6 |
HIP 26648 |
23.06 |
| 2026-03-31 12:00 |
05:38:18.86 |
+01:25:14.4 |
HIP 26648 |
22.95 |
| 2026-04-01 00:00 |
05:38:19.25 |
+01:25:22.1 |
HIP 26648 |
22.83 |
| 2026-04-01 12:00 |
05:38:19.64 |
+01:25:29.8 |
HIP 26648 |
22.71 |
| 2026-04-02 00:00 |
05:38:20.05 |
+01:25:37.5 |
HIP 26648 |
22.59 |
| 2026-04-02 12:00 |
05:38:20.48 |
+01:25:45.2 |
HIP 26648 |
22.46 |
| 2026-04-03 00:00 |
05:38:20.91 |
+01:25:52.9 |
HIP 26648 |
22.33 |
| 2026-04-03 12:00 |
05:38:21.36 |
+01:26:00.6 |
HIP 26648 |
22.20 |
| 2026-04-04 00:00 |
05:38:21.82 |
+01:26:08.2 |
HIP 26648 |
22.07 |
| 2026-04-04 12:00 |
05:38:22.29 |
+01:26:15.8 |
HIP 26648 |
21.93 |
| 2026-04-05 00:00 |
05:38:22.77 |
+01:26:23.4 |
HIP 26648 |
21.79 |
| 2026-04-05 12:00 |
05:38:23.27 |
+01:26:31.0 |
HIP 26648 |
21.65 |
| 2026-04-06 00:00 |
05:38:23.77 |
+01:26:38.6 |
HIP 26648 |
21.51 |
| 2026-04-06 12:00 |
05:38:24.29 |
+01:26:46.1 |
HIP 26648 |
21.37 |
| 2026-04-07 00:00 |
05:38:24.83 |
+01:26:53.6 |
HIP 26648 |
21.22 |
| 2026-04-07 12:00 |
05:38:25.37 |
+01:27:01.1 |
HIP 26648 |
21.07 |
| 2026-04-08 00:00 |
05:38:25.93 |
+01:27:08.6 |
HIP 26648 |
20.92 |
| 2026-04-08 12:00 |
05:38:26.49 |
+01:27:16.0 |
HIP 26648 |
20.76 |
| 2026-04-09 00:00 |
05:38:27.07 |
+01:27:23.5 |
HIP 26648 |
20.60 |
| 2026-04-09 12:00 |
05:38:27.66 |
+01:27:30.9 |
HIP 26648 |
20.45 |
| 2026-04-10 00:00 |
05:38:28.27 |
+01:27:38.2 |
HIP 26648 |
20.28 |
| 2026-04-10 12:00 |
05:38:28.88 |
+01:27:45.6 |
HIP 26648 |
20.12 |
| 2026-04-11 00:00 |
05:38:29.51 |
+01:27:52.9 |
HIP 26648 |
19.95 |
| 2026-04-11 12:00 |
05:38:30.14 |
+01:28:00.2 |
HIP 26648 |
19.78 |
| 2026-04-12 00:00 |
05:38:30.79 |
+01:28:07.5 |
HIP 26648 |
19.61 |
| 2026-04-12 12:00 |
05:38:31.46 |
+01:28:14.7 |
HIP 26648 |
19.44 |
| 2026-04-13 00:00 |
05:38:32.13 |
+01:28:22.0 |
HIP 26648 |
19.27 |
| 2026-04-13 12:00 |
05:38:32.81 |
+01:28:29.2 |
HIP 26648 |
19.09 |
| 2026-04-14 00:00 |
05:38:33.51 |
+01:28:36.3 |
HIP 26648 |
18.91 |
| 2026-04-14 12:00 |
05:38:34.21 |
+01:28:43.4 |
HIP 26648 |
18.73 |
| 2026-04-15 00:00 |
05:38:34.93 |
+01:28:50.5 |
HIP 26648 |
18.54 |
| 2026-04-15 12:00 |
05:38:35.66 |
+01:28:57.6 |
HIP 26648 |
18.36 |
| 2026-04-16 00:00 |
05:38:36.40 |
+01:29:04.6 |
HIP 26648 |
18.17 |