C/1901 G1 (Great comet)

Metadata

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

C/1901 G1 (Great comet) · Magnitude (Full range)

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