C/1917 H1 (Schaumasse)
| Parameter |
Value |
| Designation |
C/1917 H1 (Schaumasse) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1917-05-18T16:57:51.399360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:02Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
31.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1917-05-25.0000000 |
| e |
1.00006471 |
| q (au) |
0.764170 |
| a (au) |
-11809.001775 |
| i (deg) |
158.739267 |
| Ω (om, deg) |
10.829618 |
| ω (w, deg) |
119.148065 |
| M (ma, deg) |
0.000005 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.089 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.089 |
| n |
6.000 |
| 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) |
| 2026-02-03 00:00 |
05:17:03.81 |
+03:08:58.1 |
HIP 24588 |
9.30 |
| 2026-02-03 12:00 |
05:17:03.23 |
+03:09:01.4 |
HIP 24588 |
9.14 |
| 2026-02-04 00:00 |
05:17:02.66 |
+03:09:04.8 |
HIP 24588 |
8.99 |
| 2026-02-04 12:00 |
05:17:02.10 |
+03:09:08.2 |
HIP 24588 |
8.84 |
| 2026-02-05 00:00 |
05:17:01.54 |
+03:09:11.6 |
HIP 24588 |
8.69 |
| 2026-02-05 12:00 |
05:17:00.99 |
+03:09:15.1 |
HIP 24588 |
8.54 |
| 2026-02-06 00:00 |
05:17:00.45 |
+03:09:18.6 |
HIP 24588 |
8.39 |
| 2026-02-06 12:00 |
05:16:59.91 |
+03:09:22.1 |
HIP 24588 |
8.25 |
| 2026-02-07 00:00 |
05:16:59.38 |
+03:09:25.7 |
HIP 24588 |
8.10 |
| 2026-02-07 12:00 |
05:16:58.86 |
+03:09:29.3 |
HIP 24588 |
7.96 |
| 2026-02-08 00:00 |
05:16:58.34 |
+03:09:32.9 |
HIP 24588 |
7.82 |
| 2026-02-08 12:00 |
05:16:57.84 |
+03:09:36.5 |
HIP 24588 |
7.68 |
| 2026-02-09 00:00 |
05:16:57.34 |
+03:09:40.2 |
HIP 24588 |
7.54 |
| 2026-02-09 12:00 |
05:16:56.84 |
+03:09:43.9 |
HIP 24588 |
7.40 |
| 2026-02-10 00:00 |
05:16:56.36 |
+03:09:47.6 |
HIP 24588 |
7.27 |
| 2026-02-10 12:00 |
05:16:55.88 |
+03:09:51.4 |
HIP 24588 |
7.13 |
| 2026-02-11 00:00 |
05:16:55.40 |
+03:09:55.2 |
HIP 24588 |
7.00 |
| 2026-02-11 12:00 |
05:16:54.94 |
+03:09:59.0 |
HIP 24588 |
6.87 |
| 2026-02-12 00:00 |
05:16:54.48 |
+03:10:02.9 |
HIP 24588 |
6.74 |
| 2026-02-12 12:00 |
05:16:54.03 |
+03:10:06.7 |
HIP 24588 |
6.61 |
| 2026-02-13 00:00 |
05:16:53.59 |
+03:10:10.6 |
HIP 24588 |
6.49 |
| 2026-02-13 12:00 |
05:16:53.16 |
+03:10:14.5 |
HIP 24588 |
6.36 |
| 2026-02-14 00:00 |
05:16:52.73 |
+03:10:18.5 |
HIP 24588 |
6.24 |
| 2026-02-14 12:00 |
05:16:52.31 |
+03:10:22.5 |
HIP 24588 |
6.12 |
| 2026-02-15 00:00 |
05:16:51.90 |
+03:10:26.5 |
HIP 24588 |
6.00 |
| 2026-02-15 12:00 |
05:16:51.50 |
+03:10:30.5 |
HIP 24588 |
5.88 |
| 2026-02-16 00:00 |
05:16:51.10 |
+03:10:34.5 |
HIP 24588 |
5.77 |
| 2026-02-16 12:00 |
05:16:50.71 |
+03:10:38.6 |
HIP 24588 |
5.66 |
| 2026-02-17 00:00 |
05:16:50.33 |
+03:10:42.7 |
HIP 24588 |
5.55 |
| 2026-02-17 12:00 |
05:16:49.96 |
+03:10:46.8 |
HIP 24588 |
5.44 |
| 2026-02-18 00:00 |
05:16:49.59 |
+03:10:51.0 |
HIP 24588 |
5.33 |
| 2026-02-18 12:00 |
05:16:49.23 |
+03:10:55.1 |
HIP 24588 |
5.22 |
| 2026-02-19 00:00 |
05:16:48.88 |
+03:10:59.3 |
HIP 24588 |
5.12 |
| 2026-02-19 12:00 |
05:16:48.54 |
+03:11:03.6 |
HIP 24588 |
5.02 |
| 2026-02-20 00:00 |
05:16:48.21 |
+03:11:07.8 |
HIP 24588 |
4.92 |
| 2026-02-20 12:00 |
05:16:47.88 |
+03:11:12.0 |
HIP 24588 |
4.83 |
| 2026-02-21 00:00 |
05:16:47.56 |
+03:11:16.3 |
HIP 24588 |
4.73 |
| 2026-02-21 12:00 |
05:16:47.25 |
+03:11:20.6 |
HIP 24588 |
4.64 |
| 2026-02-22 00:00 |
05:16:46.95 |
+03:11:24.9 |
HIP 24588 |
4.55 |
| 2026-02-22 12:00 |
05:16:46.66 |
+03:11:29.3 |
HIP 24588 |
4.47 |
| 2026-02-23 00:00 |
05:16:46.37 |
+03:11:33.6 |
HIP 24588 |
4.38 |
| 2026-02-23 12:00 |
05:16:46.09 |
+03:11:38.0 |
HIP 24588 |
4.30 |
| 2026-02-24 00:00 |
05:16:45.82 |
+03:11:42.4 |
HIP 24588 |
4.23 |