| 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) |
| 2026-07-29 00:00 |
07:26:52.19 |
-02:29:35.3 |
HIP 36206 |
8.03 |
| 2026-07-29 12:00 |
07:26:53.08 |
-02:29:38.7 |
HIP 36206 |
7.80 |
| 2026-07-30 00:00 |
07:26:53.97 |
-02:29:42.1 |
HIP 36206 |
7.57 |
| 2026-07-30 12:00 |
07:26:54.86 |
-02:29:45.5 |
HIP 36206 |
7.34 |
| 2026-07-31 00:00 |
07:26:55.74 |
-02:29:49.0 |
HIP 36206 |
7.12 |
| 2026-07-31 12:00 |
07:26:56.62 |
-02:29:52.6 |
HIP 36206 |
6.89 |
| 2026-08-01 00:00 |
07:26:57.50 |
-02:29:56.2 |
HIP 36206 |
6.66 |
| 2026-08-01 12:00 |
07:26:58.38 |
-02:29:59.8 |
HIP 36206 |
6.43 |
| 2026-08-02 00:00 |
07:26:59.25 |
-02:30:03.4 |
HIP 36206 |
6.21 |
| 2026-08-02 12:00 |
07:27:00.12 |
-02:30:07.1 |
HIP 36206 |
5.98 |
| 2026-08-03 00:00 |
07:27:00.99 |
-02:30:10.9 |
HIP 36206 |
5.75 |
| 2026-08-03 12:00 |
07:27:01.86 |
-02:30:14.7 |
HIP 36206 |
5.53 |
| 2026-08-04 00:00 |
07:27:02.72 |
-02:30:18.5 |
HIP 36206 |
5.31 |
| 2026-08-04 12:00 |
07:27:03.58 |
-02:30:22.3 |
HIP 36206 |
5.08 |
| 2026-08-05 00:00 |
07:27:04.44 |
-02:30:26.2 |
HIP 36206 |
4.86 |
| 2026-08-05 12:00 |
07:27:05.30 |
-02:30:30.2 |
HIP 36206 |
4.64 |
| 2026-08-06 00:00 |
07:27:06.15 |
-02:30:34.2 |
HIP 36206 |
4.41 |
| 2026-08-06 12:00 |
07:27:07.00 |
-02:30:38.2 |
HIP 36206 |
4.19 |
| 2026-08-07 00:00 |
07:27:07.85 |
-02:30:42.2 |
HIP 36206 |
3.97 |
| 2026-08-07 12:00 |
07:27:08.69 |
-02:30:46.3 |
HIP 36206 |
3.75 |
| 2026-08-08 00:00 |
07:27:09.53 |
-02:30:50.5 |
HIP 36206 |
3.53 |
| 2026-08-08 12:00 |
07:27:10.37 |
-02:30:54.6 |
HIP 36206 |
3.31 |
| 2026-08-09 00:00 |
07:27:11.20 |
-02:30:58.8 |
HIP 36206 |
3.10 |
| 2026-08-09 12:00 |
07:27:12.03 |
-02:31:03.1 |
HIP 36206 |
2.88 |
| 2026-08-10 00:00 |
07:27:12.86 |
-02:31:07.4 |
HIP 36206 |
2.67 |
| 2026-08-10 12:00 |
07:27:13.68 |
-02:31:11.7 |
HIP 36206 |
2.45 |
| 2026-08-11 00:00 |
07:27:14.50 |
-02:31:16.0 |
HIP 36206 |
2.24 |
| 2026-08-11 12:00 |
07:27:15.32 |
-02:31:20.4 |
HIP 36206 |
2.03 |
| 2026-08-12 00:00 |
07:27:16.13 |
-02:31:24.9 |
HIP 36206 |
1.82 |
| 2026-08-12 12:00 |
07:27:16.94 |
-02:31:29.3 |
HIP 36206 |
1.62 |
| 2026-08-13 00:00 |
07:27:17.75 |
-02:31:33.8 |
HIP 36206 |
1.42 |
| 2026-08-13 12:00 |
07:27:18.55 |
-02:31:38.4 |
HIP 36206 |
1.23 |
| 2026-08-14 00:00 |
07:27:19.34 |
-02:31:42.9 |
HIP 36206 |
1.04 |
| 2026-08-14 12:00 |
07:27:20.14 |
-02:31:47.5 |
HIP 36206 |
0.87 |
| 2026-08-15 00:00 |
07:27:20.93 |
-02:31:52.2 |
HIP 36206 |
0.73 |
| 2026-08-15 12:00 |
07:27:21.71 |
-02:31:56.8 |
HIP 36206 |
0.62 |
| 2026-08-16 00:00 |
07:27:22.49 |
-02:32:01.5 |
HIP 36206 |
0.58 |
| 2026-08-16 12:00 |
07:27:23.27 |
-02:32:06.3 |
HIP 36206 |
0.61 |
| 2026-08-17 00:00 |
07:27:24.04 |
-02:32:11.0 |
HIP 36206 |
0.71 |
| 2026-08-17 12:00 |
07:27:24.81 |
-02:32:15.8 |
HIP 36206 |
0.85 |
| 2026-08-18 00:00 |
07:27:25.58 |
-02:32:20.7 |
HIP 36206 |
1.01 |
| 2026-08-18 12:00 |
07:27:26.34 |
-02:32:25.5 |
HIP 36206 |
1.18 |
| 2026-08-19 00:00 |
07:27:27.09 |
-02:32:30.4 |
HIP 36206 |
1.37 |