| 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 |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
06:43:56.79 |
+36:42:19.0 |
HIP 32263 |
17.58 |
| 2026-07-29 12:00 |
06:43:57.71 |
+36:42:19.5 |
HIP 32263 |
17.54 |
| 2026-07-30 00:00 |
06:43:58.63 |
+36:42:20.1 |
HIP 32263 |
17.51 |
| 2026-07-30 12:00 |
06:43:59.55 |
+36:42:20.6 |
HIP 32263 |
17.47 |
| 2026-07-31 00:00 |
06:44:00.46 |
+36:42:21.2 |
HIP 32263 |
17.44 |
| 2026-07-31 12:00 |
06:44:01.36 |
+36:42:21.8 |
HIP 32263 |
17.40 |
| 2026-08-01 00:00 |
06:44:02.27 |
+36:42:22.5 |
HIP 32263 |
17.37 |
| 2026-08-01 12:00 |
06:44:03.17 |
+36:42:23.2 |
HIP 32263 |
17.34 |
| 2026-08-02 00:00 |
06:44:04.06 |
+36:42:23.9 |
HIP 32263 |
17.31 |
| 2026-08-02 12:00 |
06:44:04.95 |
+36:42:24.6 |
HIP 32263 |
17.29 |
| 2026-08-03 00:00 |
06:44:05.84 |
+36:42:25.3 |
HIP 32263 |
17.26 |
| 2026-08-03 12:00 |
06:44:06.72 |
+36:42:26.1 |
HIP 32263 |
17.24 |
| 2026-08-04 00:00 |
06:44:07.60 |
+36:42:26.9 |
HIP 32263 |
17.21 |
| 2026-08-04 12:00 |
06:44:08.47 |
+36:42:27.7 |
HIP 32263 |
17.19 |
| 2026-08-05 00:00 |
06:44:09.34 |
+36:42:28.5 |
HIP 32263 |
17.17 |
| 2026-08-05 12:00 |
06:44:10.20 |
+36:42:29.4 |
HIP 32263 |
17.15 |
| 2026-08-06 00:00 |
06:44:11.06 |
+36:42:30.3 |
HIP 32263 |
17.14 |
| 2026-08-06 12:00 |
06:44:11.92 |
+36:42:31.2 |
HIP 32263 |
17.12 |
| 2026-08-07 00:00 |
06:44:12.77 |
+36:42:32.2 |
HIP 32263 |
17.11 |
| 2026-08-07 12:00 |
06:44:13.62 |
+36:42:33.1 |
HIP 32263 |
17.09 |
| 2026-08-08 00:00 |
06:44:14.46 |
+36:42:34.1 |
HIP 32263 |
17.08 |
| 2026-08-08 12:00 |
06:44:15.29 |
+36:42:35.2 |
HIP 32263 |
17.07 |
| 2026-08-09 00:00 |
06:44:16.12 |
+36:42:36.2 |
HIP 32263 |
17.06 |
| 2026-08-09 12:00 |
06:44:16.95 |
+36:42:37.3 |
HIP 32263 |
17.05 |
| 2026-08-10 00:00 |
06:44:17.77 |
+36:42:38.4 |
HIP 32263 |
17.05 |
| 2026-08-10 12:00 |
06:44:18.58 |
+36:42:39.5 |
HIP 32263 |
17.04 |
| 2026-08-11 00:00 |
06:44:19.39 |
+36:42:40.6 |
HIP 32263 |
17.03 |
| 2026-08-11 12:00 |
06:44:20.20 |
+36:42:41.8 |
HIP 32263 |
17.03 |
| 2026-08-12 00:00 |
06:44:21.00 |
+36:42:43.0 |
HIP 32263 |
17.03 |
| 2026-08-12 12:00 |
06:44:21.79 |
+36:42:44.2 |
HIP 32263 |
17.02 |
| 2026-08-13 00:00 |
06:44:22.58 |
+36:42:45.4 |
HIP 32263 |
17.02 |
| 2026-08-13 12:00 |
06:44:23.36 |
+36:42:46.7 |
HIP 32263 |
17.02 |
| 2026-08-14 00:00 |
06:44:24.14 |
+36:42:48.0 |
HIP 32263 |
17.02 |
| 2026-08-14 12:00 |
06:44:24.91 |
+36:42:49.3 |
HIP 32263 |
17.03 |
| 2026-08-15 00:00 |
06:44:25.68 |
+36:42:50.6 |
HIP 32263 |
17.03 |
| 2026-08-15 12:00 |
06:44:26.44 |
+36:42:52.0 |
HIP 32263 |
17.03 |
| 2026-08-16 00:00 |
06:44:27.19 |
+36:42:53.4 |
HIP 32263 |
17.04 |
| 2026-08-16 12:00 |
06:44:27.94 |
+36:42:54.8 |
HIP 32263 |
17.04 |
| 2026-08-17 00:00 |
06:44:28.68 |
+36:42:56.2 |
HIP 32263 |
17.05 |
| 2026-08-17 12:00 |
06:44:29.42 |
+36:42:57.7 |
HIP 32263 |
17.05 |
| 2026-08-18 00:00 |
06:44:30.15 |
+36:42:59.1 |
HIP 32263 |
17.06 |
| 2026-08-18 12:00 |
06:44:30.87 |
+36:43:00.6 |
HIP 32263 |
17.07 |
| 2026-08-19 00:00 |
06:44:31.59 |
+36:43:02.2 |
HIP 32263 |
17.07 |