C/1901 G1 (Great comet)
| Parameter |
Value |
| Designation |
C/1901 G1 (Great comet) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1901-04-24T18:01:03.720000Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:30Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1901-05-18.0000000 |
| e |
0.99993092 |
| q (au) |
0.244794 |
| a (au) |
3543.398137 |
| i (deg) |
131.077661 |
| Ω (om, deg) |
111.037984 |
| ω (w, deg) |
203.045920 |
| M (ma, deg) |
0.000109 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.313 + 3.428\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.313 |
| n |
3.428 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
06:41:56.22 |
+36:53:55.0 |
HIP 32100 |
13.01 |
| 2026-02-03 12:00 |
06:41:55.32 |
+36:53:54.1 |
HIP 32100 |
13.10 |
| 2026-02-04 00:00 |
06:41:54.43 |
+36:53:53.1 |
HIP 32100 |
13.19 |
| 2026-02-04 12:00 |
06:41:53.54 |
+36:53:52.1 |
HIP 32100 |
13.28 |
| 2026-02-05 00:00 |
06:41:52.66 |
+36:53:51.1 |
HIP 32100 |
13.38 |
| 2026-02-05 12:00 |
06:41:51.78 |
+36:53:50.1 |
HIP 32100 |
13.47 |
| 2026-02-06 00:00 |
06:41:50.91 |
+36:53:49.0 |
HIP 32100 |
13.57 |
| 2026-02-06 12:00 |
06:41:50.04 |
+36:53:47.9 |
HIP 32100 |
13.67 |
| 2026-02-07 00:00 |
06:41:49.19 |
+36:53:46.8 |
HIP 32100 |
13.77 |
| 2026-02-07 12:00 |
06:41:48.33 |
+36:53:45.7 |
HIP 32100 |
13.87 |
| 2026-02-08 00:00 |
06:41:47.48 |
+36:53:44.5 |
HIP 32100 |
13.97 |
| 2026-02-08 12:00 |
06:41:46.64 |
+36:53:43.3 |
HIP 32100 |
14.07 |
| 2026-02-09 00:00 |
06:41:45.81 |
+36:53:42.1 |
HIP 32100 |
14.18 |
| 2026-02-09 12:00 |
06:41:44.98 |
+36:53:40.9 |
HIP 32100 |
14.28 |
| 2026-02-10 00:00 |
06:41:44.15 |
+36:53:39.6 |
HIP 32100 |
14.39 |
| 2026-02-10 12:00 |
06:41:43.34 |
+36:53:38.3 |
HIP 32100 |
14.50 |
| 2026-02-11 00:00 |
06:41:42.53 |
+36:53:37.0 |
HIP 32100 |
14.60 |
| 2026-02-11 12:00 |
06:41:41.72 |
+36:53:35.6 |
HIP 32100 |
14.71 |
| 2026-02-12 00:00 |
06:41:40.93 |
+36:53:34.2 |
HIP 32100 |
14.82 |
| 2026-02-12 12:00 |
06:41:40.13 |
+36:53:32.9 |
HIP 32100 |
14.93 |
| 2026-02-13 00:00 |
06:41:39.35 |
+36:53:31.4 |
HIP 32100 |
15.04 |
| 2026-02-13 12:00 |
06:41:38.57 |
+36:53:30.0 |
HIP 32100 |
15.15 |
| 2026-02-14 00:00 |
06:41:37.80 |
+36:53:28.5 |
HIP 32100 |
15.26 |
| 2026-02-14 12:00 |
06:41:37.04 |
+36:53:27.0 |
HIP 32100 |
15.37 |
| 2026-02-15 00:00 |
06:41:36.28 |
+36:53:25.5 |
HIP 32100 |
15.48 |
| 2026-02-15 12:00 |
06:41:35.53 |
+36:53:23.9 |
HIP 32100 |
15.59 |
| 2026-02-16 00:00 |
06:41:34.78 |
+36:53:22.4 |
HIP 32100 |
15.71 |
| 2026-02-16 12:00 |
06:41:34.05 |
+36:53:20.8 |
HIP 32100 |
15.82 |
| 2026-02-17 00:00 |
06:41:33.32 |
+36:53:19.2 |
HIP 32100 |
15.93 |
| 2026-02-17 12:00 |
06:41:32.59 |
+36:53:17.5 |
HIP 32100 |
16.04 |
| 2026-02-18 00:00 |
06:41:31.88 |
+36:53:15.8 |
HIP 32100 |
16.15 |
| 2026-02-18 12:00 |
06:41:31.17 |
+36:53:14.2 |
HIP 32100 |
16.26 |
| 2026-02-19 00:00 |
06:41:30.47 |
+36:53:12.4 |
HIP 32100 |
16.38 |
| 2026-02-19 12:00 |
06:41:29.77 |
+36:53:10.7 |
HIP 32100 |
16.49 |
| 2026-02-20 00:00 |
06:41:29.09 |
+36:53:08.9 |
HIP 32100 |
16.60 |
| 2026-02-20 12:00 |
06:41:28.41 |
+36:53:07.2 |
HIP 32100 |
16.71 |
| 2026-02-21 00:00 |
06:41:27.74 |
+36:53:05.4 |
HIP 32100 |
16.82 |
| 2026-02-21 12:00 |
06:41:27.08 |
+36:53:03.5 |
HIP 32100 |
16.93 |
| 2026-02-22 00:00 |
06:41:26.42 |
+36:53:01.7 |
HIP 32100 |
17.04 |
| 2026-02-22 12:00 |
06:41:25.77 |
+36:52:59.8 |
HIP 32100 |
17.15 |
| 2026-02-23 00:00 |
06:41:25.13 |
+36:52:57.9 |
HIP 32100 |
17.26 |
| 2026-02-23 12:00 |
06:41:24.50 |
+36:52:56.0 |
HIP 32100 |
17.37 |
| 2026-02-24 00:00 |
06:41:23.87 |
+36:52:54.0 |
HIP 32100 |
17.47 |