| Parameter |
Value |
| Designation |
C/1894 G1 (Gale) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1894-04-13T21:03:24.776640Z |
| Orbit solution date (soln_date, UTC) |
2023-12-04T20:32:28Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1894-06-04.0000000 |
| e |
0.98894455 |
| q (au) |
0.982984 |
| a (au) |
88.914014 |
| i (deg) |
86.958520 |
| Ω (om, deg) |
207.890404 |
| ω (w, deg) |
324.173891 |
| M (ma, deg) |
0.060098 |
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) |
| 2026-05-12 00:00 |
00:11:22.97 |
+47:15:47.6 |
HIP 826 |
13.19 |
| 2026-05-12 12:00 |
00:11:23.89 |
+47:15:58.0 |
HIP 826 |
13.31 |
| 2026-05-13 00:00 |
00:11:24.79 |
+47:16:08.5 |
HIP 826 |
13.43 |
| 2026-05-13 12:00 |
00:11:25.68 |
+47:16:18.9 |
HIP 826 |
13.55 |
| 2026-05-14 00:00 |
00:11:26.57 |
+47:16:29.5 |
HIP 826 |
13.67 |
| 2026-05-14 12:00 |
00:11:27.44 |
+47:16:40.0 |
HIP 826 |
13.80 |
| 2026-05-15 00:00 |
00:11:28.31 |
+47:16:50.6 |
HIP 826 |
13.92 |
| 2026-05-15 12:00 |
00:11:29.17 |
+47:17:01.2 |
HIP 980 |
13.99 |
| 2026-05-16 00:00 |
00:11:30.02 |
+47:17:11.8 |
HIP 980 |
13.76 |
| 2026-05-16 12:00 |
00:11:30.86 |
+47:17:22.5 |
HIP 980 |
13.54 |
| 2026-05-17 00:00 |
00:11:31.70 |
+47:17:33.2 |
HIP 980 |
13.32 |
| 2026-05-17 12:00 |
00:11:32.52 |
+47:17:43.9 |
HIP 980 |
13.10 |
| 2026-05-18 00:00 |
00:11:33.34 |
+47:17:54.7 |
HIP 980 |
12.87 |
| 2026-05-18 12:00 |
00:11:34.14 |
+47:18:05.5 |
HIP 980 |
12.65 |
| 2026-05-19 00:00 |
00:11:34.94 |
+47:18:16.3 |
HIP 980 |
12.43 |
| 2026-05-19 12:00 |
00:11:35.73 |
+47:18:27.1 |
HIP 980 |
12.21 |
| 2026-05-20 00:00 |
00:11:36.51 |
+47:18:38.0 |
HIP 980 |
11.99 |
| 2026-05-20 12:00 |
00:11:37.28 |
+47:18:48.8 |
HIP 980 |
11.77 |
| 2026-05-21 00:00 |
00:11:38.04 |
+47:18:59.7 |
HIP 980 |
11.55 |
| 2026-05-21 12:00 |
00:11:38.79 |
+47:19:10.6 |
HIP 980 |
11.33 |
| 2026-05-22 00:00 |
00:11:39.53 |
+47:19:21.6 |
HIP 980 |
11.12 |
| 2026-05-22 12:00 |
00:11:40.27 |
+47:19:32.5 |
HIP 980 |
10.90 |
| 2026-05-23 00:00 |
00:11:40.99 |
+47:19:43.5 |
HIP 980 |
10.68 |
| 2026-05-23 12:00 |
00:11:41.70 |
+47:19:54.5 |
HIP 980 |
10.46 |
| 2026-05-24 00:00 |
00:11:42.41 |
+47:20:05.5 |
HIP 980 |
10.25 |
| 2026-05-24 12:00 |
00:11:43.10 |
+47:20:16.5 |
HIP 980 |
10.03 |
| 2026-05-25 00:00 |
00:11:43.78 |
+47:20:27.6 |
HIP 980 |
9.82 |
| 2026-05-25 12:00 |
00:11:44.46 |
+47:20:38.6 |
HIP 980 |
9.60 |
| 2026-05-26 00:00 |
00:11:45.12 |
+47:20:49.7 |
HIP 980 |
9.39 |
| 2026-05-26 12:00 |
00:11:45.78 |
+47:21:00.8 |
HIP 980 |
9.18 |
| 2026-05-27 00:00 |
00:11:46.43 |
+47:21:11.9 |
HIP 980 |
8.96 |
| 2026-05-27 12:00 |
00:11:47.06 |
+47:21:23.0 |
HIP 980 |
8.75 |
| 2026-05-28 00:00 |
00:11:47.69 |
+47:21:34.1 |
HIP 980 |
8.54 |
| 2026-05-28 12:00 |
00:11:48.30 |
+47:21:45.2 |
HIP 980 |
8.33 |
| 2026-05-29 00:00 |
00:11:48.91 |
+47:21:56.4 |
HIP 980 |
8.12 |
| 2026-05-29 12:00 |
00:11:49.50 |
+47:22:07.5 |
HIP 980 |
7.91 |
| 2026-05-30 00:00 |
00:11:50.09 |
+47:22:18.6 |
HIP 980 |
7.70 |
| 2026-05-30 12:00 |
00:11:50.67 |
+47:22:29.8 |
HIP 980 |
7.49 |
| 2026-05-31 00:00 |
00:11:51.23 |
+47:22:41.0 |
HIP 980 |
7.28 |
| 2026-05-31 12:00 |
00:11:51.79 |
+47:22:52.1 |
HIP 980 |
7.07 |
| 2026-06-01 00:00 |
00:11:52.33 |
+47:23:03.3 |
HIP 980 |
6.87 |
| 2026-06-01 12:00 |
00:11:52.87 |
+47:23:14.5 |
HIP 980 |
6.66 |
| 2026-06-02 00:00 |
00:11:53.39 |
+47:23:25.7 |
HIP 980 |
6.46 |