| 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) |
| 2026-09-20 00:00 |
07:28:04.00 |
-02:38:31.4 |
HIP 36206 |
12.33 |
| 2026-09-20 12:00 |
07:28:04.36 |
-02:38:37.5 |
HIP 36206 |
12.47 |
| 2026-09-21 00:00 |
07:28:04.72 |
-02:38:43.6 |
HIP 36206 |
12.60 |
| 2026-09-21 12:00 |
07:28:05.07 |
-02:38:49.7 |
HIP 36206 |
12.73 |
| 2026-09-22 00:00 |
07:28:05.42 |
-02:38:55.9 |
HIP 36206 |
12.86 |
| 2026-09-22 12:00 |
07:28:05.76 |
-02:39:02.0 |
HIP 36206 |
12.99 |
| 2026-09-23 00:00 |
07:28:06.09 |
-02:39:08.1 |
HIP 36206 |
13.11 |
| 2026-09-23 12:00 |
07:28:06.41 |
-02:39:14.3 |
HIP 36206 |
13.24 |
| 2026-09-24 00:00 |
07:28:06.73 |
-02:39:20.4 |
HIP 36206 |
13.36 |
| 2026-09-24 12:00 |
07:28:07.03 |
-02:39:26.5 |
HIP 36206 |
13.48 |
| 2026-09-25 00:00 |
07:28:07.34 |
-02:39:32.7 |
HIP 36260 |
13.52 |
| 2026-09-25 12:00 |
07:28:07.63 |
-02:39:38.8 |
HIP 36260 |
13.43 |
| 2026-09-26 00:00 |
07:28:07.91 |
-02:39:44.9 |
HIP 36260 |
13.34 |
| 2026-09-26 12:00 |
07:28:08.19 |
-02:39:51.1 |
HIP 36260 |
13.25 |
| 2026-09-27 00:00 |
07:28:08.46 |
-02:39:57.2 |
HIP 36260 |
13.16 |
| 2026-09-27 12:00 |
07:28:08.73 |
-02:40:03.4 |
HIP 36260 |
13.07 |
| 2026-09-28 00:00 |
07:28:08.98 |
-02:40:09.5 |
HIP 36260 |
12.98 |
| 2026-09-28 12:00 |
07:28:09.23 |
-02:40:15.6 |
HIP 36260 |
12.89 |
| 2026-09-29 00:00 |
07:28:09.47 |
-02:40:21.8 |
HIP 36260 |
12.80 |
| 2026-09-29 12:00 |
07:28:09.70 |
-02:40:27.9 |
HIP 36260 |
12.71 |
| 2026-09-30 00:00 |
07:28:09.93 |
-02:40:34.0 |
HIP 36260 |
12.62 |
| 2026-09-30 12:00 |
07:28:10.15 |
-02:40:40.2 |
HIP 36260 |
12.53 |
| 2026-10-01 00:00 |
07:28:10.36 |
-02:40:46.3 |
HIP 36260 |
12.44 |
| 2026-10-01 12:00 |
07:28:10.56 |
-02:40:52.4 |
HIP 36260 |
12.35 |
| 2026-10-02 00:00 |
07:28:10.75 |
-02:40:58.5 |
HIP 36260 |
12.27 |
| 2026-10-02 12:00 |
07:28:10.94 |
-02:41:04.6 |
HIP 36260 |
12.18 |
| 2026-10-03 00:00 |
07:28:11.12 |
-02:41:10.7 |
HIP 36260 |
12.09 |
| 2026-10-03 12:00 |
07:28:11.29 |
-02:41:16.8 |
HIP 36260 |
12.00 |
| 2026-10-04 00:00 |
07:28:11.45 |
-02:41:22.9 |
HIP 36260 |
11.91 |
| 2026-10-04 12:00 |
07:28:11.61 |
-02:41:29.0 |
HIP 36260 |
11.82 |
| 2026-10-05 00:00 |
07:28:11.75 |
-02:41:35.1 |
HIP 36260 |
11.73 |
| 2026-10-05 12:00 |
07:28:11.89 |
-02:41:41.2 |
HIP 36260 |
11.64 |
| 2026-10-06 00:00 |
07:28:12.03 |
-02:41:47.3 |
HIP 36260 |
11.56 |
| 2026-10-06 12:00 |
07:28:12.15 |
-02:41:53.3 |
HIP 36260 |
11.47 |
| 2026-10-07 00:00 |
07:28:12.27 |
-02:41:59.4 |
HIP 36260 |
11.38 |
| 2026-10-07 12:00 |
07:28:12.37 |
-02:42:05.4 |
HIP 36260 |
11.29 |
| 2026-10-08 00:00 |
07:28:12.47 |
-02:42:11.4 |
HIP 36260 |
11.20 |
| 2026-10-08 12:00 |
07:28:12.56 |
-02:42:17.4 |
HIP 36260 |
11.11 |
| 2026-10-09 00:00 |
07:28:12.65 |
-02:42:23.5 |
HIP 36260 |
11.02 |
| 2026-10-09 12:00 |
07:28:12.72 |
-02:42:29.5 |
HIP 36260 |
10.93 |
| 2026-10-10 00:00 |
07:28:12.79 |
-02:42:35.4 |
HIP 36260 |
10.84 |
| 2026-10-10 12:00 |
07:28:12.85 |
-02:42:41.4 |
HIP 36260 |
10.75 |
| 2026-10-11 00:00 |
07:28:12.90 |
-02:42:47.4 |
HIP 36260 |
10.66 |