C/1916 G1 (Wolf)
| Parameter |
Value |
| Designation |
C/1916 G1 (Wolf) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1917-06-17T01:46:38.360640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:02Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
15.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1917-05-31.0000000 |
| e |
0.99942183 |
| q (au) |
1.686431 |
| a (au) |
2916.855378 |
| i (deg) |
25.658727 |
| Ω (om, deg) |
184.457341 |
| ω (w, deg) |
120.621111 |
| M (ma, deg) |
359.999893 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.290 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.290 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
07:25:34.11 |
-02:48:34.6 |
HIP 36004 |
20.18 |
| 2026-02-03 12:00 |
07:25:33.25 |
-02:48:30.4 |
HIP 36004 |
20.19 |
| 2026-02-04 00:00 |
07:25:32.40 |
-02:48:26.1 |
HIP 36004 |
20.21 |
| 2026-02-04 12:00 |
07:25:31.54 |
-02:48:21.9 |
HIP 36004 |
20.22 |
| 2026-02-05 00:00 |
07:25:30.70 |
-02:48:17.6 |
HIP 36004 |
20.25 |
| 2026-02-05 12:00 |
07:25:29.85 |
-02:48:13.2 |
HIP 36004 |
20.27 |
| 2026-02-06 00:00 |
07:25:29.01 |
-02:48:08.8 |
HIP 36004 |
20.30 |
| 2026-02-06 12:00 |
07:25:28.17 |
-02:48:04.4 |
HIP 36004 |
20.34 |
| 2026-02-07 00:00 |
07:25:27.34 |
-02:48:00.0 |
HIP 36004 |
20.37 |
| 2026-02-07 12:00 |
07:25:26.50 |
-02:47:55.4 |
HIP 36004 |
20.41 |
| 2026-02-08 00:00 |
07:25:25.68 |
-02:47:50.8 |
HIP 36004 |
20.45 |
| 2026-02-08 12:00 |
07:25:24.86 |
-02:47:46.3 |
HIP 36004 |
20.50 |
| 2026-02-09 00:00 |
07:25:24.04 |
-02:47:41.6 |
HIP 36004 |
20.55 |
| 2026-02-09 12:00 |
07:25:23.22 |
-02:47:37.0 |
HIP 36004 |
20.60 |
| 2026-02-10 00:00 |
07:25:22.41 |
-02:47:32.3 |
HIP 36004 |
20.65 |
| 2026-02-10 12:00 |
07:25:21.61 |
-02:47:27.5 |
HIP 36004 |
20.71 |
| 2026-02-11 00:00 |
07:25:20.81 |
-02:47:22.8 |
HIP 36004 |
20.77 |
| 2026-02-11 12:00 |
07:25:20.01 |
-02:47:18.0 |
HIP 36004 |
20.83 |
| 2026-02-12 00:00 |
07:25:19.22 |
-02:47:13.1 |
HIP 36004 |
20.89 |
| 2026-02-12 12:00 |
07:25:18.43 |
-02:47:08.2 |
HIP 36004 |
20.96 |
| 2026-02-13 00:00 |
07:25:17.65 |
-02:47:03.3 |
HIP 36004 |
21.03 |
| 2026-02-13 12:00 |
07:25:16.87 |
-02:46:58.4 |
HIP 36004 |
21.10 |
| 2026-02-14 00:00 |
07:25:16.10 |
-02:46:53.4 |
HIP 36004 |
21.18 |
| 2026-02-14 12:00 |
07:25:15.33 |
-02:46:48.4 |
HIP 36004 |
21.26 |
| 2026-02-15 00:00 |
07:25:14.57 |
-02:46:43.3 |
HIP 36004 |
21.34 |
| 2026-02-15 12:00 |
07:25:13.81 |
-02:46:38.2 |
HIP 36004 |
21.42 |
| 2026-02-16 00:00 |
07:25:13.06 |
-02:46:33.1 |
HIP 36004 |
21.50 |
| 2026-02-16 12:00 |
07:25:12.31 |
-02:46:28.0 |
HIP 36004 |
21.59 |
| 2026-02-17 00:00 |
07:25:11.57 |
-02:46:22.8 |
HIP 36004 |
21.68 |
| 2026-02-17 12:00 |
07:25:10.83 |
-02:46:17.6 |
HIP 36004 |
21.77 |
| 2026-02-18 00:00 |
07:25:10.09 |
-02:46:12.4 |
HIP 36004 |
21.86 |
| 2026-02-18 12:00 |
07:25:09.37 |
-02:46:07.1 |
HIP 36004 |
21.96 |
| 2026-02-19 00:00 |
07:25:08.65 |
-02:46:01.8 |
HIP 36004 |
22.05 |
| 2026-02-19 12:00 |
07:25:07.93 |
-02:45:56.5 |
HIP 36004 |
22.15 |
| 2026-02-20 00:00 |
07:25:07.22 |
-02:45:51.1 |
HIP 36004 |
22.25 |
| 2026-02-20 12:00 |
07:25:06.51 |
-02:45:45.7 |
HIP 36004 |
22.35 |
| 2026-02-21 00:00 |
07:25:05.81 |
-02:45:40.3 |
HIP 36004 |
22.46 |
| 2026-02-21 12:00 |
07:25:05.12 |
-02:45:34.9 |
HIP 36004 |
22.56 |
| 2026-02-22 00:00 |
07:25:04.43 |
-02:45:29.4 |
HIP 36004 |
22.67 |
| 2026-02-22 12:00 |
07:25:03.75 |
-02:45:23.9 |
HIP 36004 |
22.78 |
| 2026-02-23 00:00 |
07:25:03.07 |
-02:45:18.4 |
HIP 36004 |
22.89 |
| 2026-02-23 12:00 |
07:25:02.40 |
-02:45:12.9 |
HIP 36004 |
23.00 |
| 2026-02-24 00:00 |
07:25:01.74 |
-02:45:07.3 |
HIP 36004 |
23.11 |