| 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) |
| 2026-05-12 00:00 |
07:24:46.82 |
-02:30:35.7 |
HIP 35843 |
20.18 |
| 2026-05-12 12:00 |
07:24:47.30 |
-02:30:31.7 |
HIP 35843 |
20.31 |
| 2026-05-13 00:00 |
07:24:47.80 |
-02:30:27.7 |
HIP 35843 |
20.45 |
| 2026-05-13 12:00 |
07:24:48.30 |
-02:30:23.8 |
HIP 35843 |
20.59 |
| 2026-05-14 00:00 |
07:24:48.80 |
-02:30:19.8 |
HIP 35843 |
20.72 |
| 2026-05-14 12:00 |
07:24:49.32 |
-02:30:16.0 |
HIP 35843 |
20.86 |
| 2026-05-15 00:00 |
07:24:49.84 |
-02:30:12.1 |
HIP 35843 |
21.01 |
| 2026-05-15 12:00 |
07:24:50.37 |
-02:30:08.3 |
HIP 35843 |
21.15 |
| 2026-05-16 00:00 |
07:24:50.90 |
-02:30:04.6 |
HIP 35843 |
21.29 |
| 2026-05-16 12:00 |
07:24:51.44 |
-02:30:00.9 |
HIP 35843 |
21.44 |
| 2026-05-17 00:00 |
07:24:51.98 |
-02:29:57.2 |
HIP 35843 |
21.59 |
| 2026-05-17 12:00 |
07:24:52.54 |
-02:29:53.6 |
HIP 35843 |
21.74 |
| 2026-05-18 00:00 |
07:24:53.09 |
-02:29:50.0 |
HIP 35843 |
21.89 |
| 2026-05-18 12:00 |
07:24:53.66 |
-02:29:46.5 |
HIP 36071 |
21.76 |
| 2026-05-19 00:00 |
07:24:54.23 |
-02:29:43.0 |
HIP 36071 |
21.61 |
| 2026-05-19 12:00 |
07:24:54.81 |
-02:29:39.5 |
HIP 36071 |
21.47 |
| 2026-05-20 00:00 |
07:24:55.39 |
-02:29:36.1 |
HIP 36071 |
21.32 |
| 2026-05-20 12:00 |
07:24:55.98 |
-02:29:32.8 |
HIP 36071 |
21.18 |
| 2026-05-21 00:00 |
07:24:56.57 |
-02:29:29.4 |
HIP 36071 |
21.03 |
| 2026-05-21 12:00 |
07:24:57.18 |
-02:29:26.2 |
HIP 36071 |
20.89 |
| 2026-05-22 00:00 |
07:24:57.78 |
-02:29:22.9 |
HIP 36071 |
20.74 |
| 2026-05-22 12:00 |
07:24:58.39 |
-02:29:19.7 |
HIP 36071 |
20.59 |
| 2026-05-23 00:00 |
07:24:59.01 |
-02:29:16.6 |
HIP 36071 |
20.45 |
| 2026-05-23 12:00 |
07:24:59.64 |
-02:29:13.5 |
HIP 36071 |
20.30 |
| 2026-05-24 00:00 |
07:25:00.27 |
-02:29:10.4 |
HIP 36071 |
20.15 |
| 2026-05-24 12:00 |
07:25:00.90 |
-02:29:07.4 |
HIP 36071 |
20.01 |
| 2026-05-25 00:00 |
07:25:01.54 |
-02:29:04.5 |
HIP 36071 |
19.86 |
| 2026-05-25 12:00 |
07:25:02.19 |
-02:29:01.6 |
HIP 36071 |
19.71 |
| 2026-05-26 00:00 |
07:25:02.84 |
-02:28:58.7 |
HIP 36071 |
19.56 |
| 2026-05-26 12:00 |
07:25:03.50 |
-02:28:55.9 |
HIP 36071 |
19.42 |
| 2026-05-27 00:00 |
07:25:04.16 |
-02:28:53.1 |
HIP 36071 |
19.27 |
| 2026-05-27 12:00 |
07:25:04.83 |
-02:28:50.3 |
HIP 36071 |
19.12 |
| 2026-05-28 00:00 |
07:25:05.50 |
-02:28:47.7 |
HIP 36071 |
18.97 |
| 2026-05-28 12:00 |
07:25:06.18 |
-02:28:45.0 |
HIP 36071 |
18.82 |
| 2026-05-29 00:00 |
07:25:06.86 |
-02:28:42.4 |
HIP 36071 |
18.68 |
| 2026-05-29 12:00 |
07:25:07.55 |
-02:28:39.9 |
HIP 36071 |
18.53 |
| 2026-05-30 00:00 |
07:25:08.25 |
-02:28:37.4 |
HIP 36071 |
18.38 |
| 2026-05-30 12:00 |
07:25:08.95 |
-02:28:34.9 |
HIP 36071 |
18.24 |
| 2026-05-31 00:00 |
07:25:09.65 |
-02:28:32.5 |
HIP 36071 |
18.09 |
| 2026-05-31 12:00 |
07:25:10.36 |
-02:28:30.1 |
HIP 36071 |
17.95 |
| 2026-06-01 00:00 |
07:25:11.07 |
-02:28:27.8 |
HIP 36071 |
17.80 |
| 2026-06-01 12:00 |
07:25:11.79 |
-02:28:25.6 |
HIP 36071 |
17.66 |
| 2026-06-02 00:00 |
07:25:12.51 |
-02:28:23.3 |
HIP 36071 |
17.51 |