| Parameter |
Value |
| Designation |
C/1976 D2 (Schuster) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-01-14T16:56:09.628800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
4.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1976-07-08.0000000 |
| e |
1.00111947 |
| q (au) |
6.879571 |
| a (au) |
-6145.360914 |
| i (deg) |
112.026906 |
| Ω (om, deg) |
22.785994 |
| ω (w, deg) |
193.366827 |
| M (ma, deg) |
0.001105 |
Magnitude
Scatter + Global Linear
$$
M_a = (-1.560 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-1.560 |
| n |
6.000 |
| gf |
0.971 |
| gb |
-0.796 |
| 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) |
| 2026-09-25 00:00 |
02:28:32.37 |
-07:42:54.1 |
HIP 11508 |
21.13 |
| 2026-09-25 12:00 |
02:28:31.03 |
-07:43:04.7 |
HIP 11508 |
21.27 |
| 2026-09-26 00:00 |
02:28:29.69 |
-07:43:15.2 |
HIP 11508 |
21.42 |
| 2026-09-26 12:00 |
02:28:28.34 |
-07:43:25.8 |
HIP 11508 |
21.57 |
| 2026-09-27 00:00 |
02:28:26.98 |
-07:43:36.3 |
HIP 11508 |
21.73 |
| 2026-09-27 12:00 |
02:28:25.61 |
-07:43:46.8 |
HIP 11508 |
21.89 |
| 2026-09-28 00:00 |
02:28:24.23 |
-07:43:57.2 |
HIP 11508 |
22.06 |
| 2026-09-28 12:00 |
02:28:22.85 |
-07:44:07.6 |
HIP 11508 |
22.23 |
| 2026-09-29 00:00 |
02:28:21.46 |
-07:44:18.0 |
HIP 11508 |
22.41 |
| 2026-09-29 12:00 |
02:28:20.06 |
-07:44:28.4 |
HIP 11508 |
22.59 |
| 2026-09-30 00:00 |
02:28:18.65 |
-07:44:38.7 |
HIP 11508 |
22.77 |
| 2026-09-30 12:00 |
02:28:17.23 |
-07:44:49.0 |
HIP 11508 |
22.96 |
| 2026-10-01 00:00 |
02:28:15.81 |
-07:44:59.3 |
HIP 11508 |
23.16 |
| 2026-10-01 12:00 |
02:28:14.38 |
-07:45:09.5 |
HIP 11508 |
23.36 |
| 2026-10-02 00:00 |
02:28:12.94 |
-07:45:19.7 |
HIP 11508 |
23.57 |
| 2026-10-02 12:00 |
02:28:11.50 |
-07:45:29.8 |
HIP 11508 |
23.77 |
| 2026-10-03 00:00 |
02:28:10.05 |
-07:45:39.9 |
HIP 11508 |
23.99 |
| 2026-10-03 12:00 |
02:28:08.59 |
-07:45:50.0 |
HIP 11508 |
24.21 |
| 2026-10-04 00:00 |
02:28:07.12 |
-07:46:00.1 |
HIP 11508 |
24.43 |
| 2026-10-04 12:00 |
02:28:05.65 |
-07:46:10.1 |
HIP 11508 |
24.65 |
| 2026-10-05 00:00 |
02:28:04.17 |
-07:46:20.0 |
HIP 11508 |
24.88 |
| 2026-10-05 12:00 |
02:28:02.68 |
-07:46:29.9 |
HIP 11508 |
25.12 |
| 2026-10-06 00:00 |
02:28:01.19 |
-07:46:39.8 |
HIP 11508 |
25.35 |
| 2026-10-06 12:00 |
02:27:59.69 |
-07:46:49.6 |
HIP 11508 |
25.60 |
| 2026-10-07 00:00 |
02:27:58.19 |
-07:46:59.4 |
HIP 11508 |
25.84 |
| 2026-10-07 12:00 |
02:27:56.68 |
-07:47:09.1 |
HIP 11508 |
26.09 |
| 2026-10-08 00:00 |
02:27:55.16 |
-07:47:18.8 |
HIP 11508 |
26.34 |
| 2026-10-08 12:00 |
02:27:53.64 |
-07:47:28.5 |
HIP 11508 |
26.60 |
| 2026-10-09 00:00 |
02:27:52.11 |
-07:47:38.0 |
HIP 11508 |
26.86 |
| 2026-10-09 12:00 |
02:27:50.57 |
-07:47:47.6 |
HIP 11508 |
27.12 |
| 2026-10-10 00:00 |
02:27:49.03 |
-07:47:57.1 |
HIP 11508 |
27.39 |
| 2026-10-10 12:00 |
02:27:47.49 |
-07:48:06.5 |
HIP 11508 |
27.66 |
| 2026-10-11 00:00 |
02:27:45.94 |
-07:48:15.9 |
HIP 11508 |
27.93 |
| 2026-10-11 12:00 |
02:27:44.38 |
-07:48:25.2 |
HIP 11508 |
28.21 |
| 2026-10-12 00:00 |
02:27:42.82 |
-07:48:34.5 |
HIP 11508 |
28.49 |
| 2026-10-12 12:00 |
02:27:41.25 |
-07:48:43.7 |
HIP 11508 |
28.77 |
| 2026-10-13 00:00 |
02:27:39.68 |
-07:48:52.9 |
HIP 11508 |
29.05 |
| 2026-10-13 12:00 |
02:27:38.11 |
-07:49:02.0 |
HIP 11508 |
29.34 |
| 2026-10-14 00:00 |
02:27:36.53 |
-07:49:11.1 |
HIP 11508 |
29.63 |
| 2026-10-14 12:00 |
02:27:34.94 |
-07:49:20.1 |
HIP 11508 |
29.92 |
| 2026-10-15 00:00 |
02:27:33.35 |
-07:49:29.0 |
HIP 11508 |
30.22 |
| 2026-10-15 12:00 |
02:27:31.76 |
-07:49:37.9 |
HIP 11508 |
30.52 |
| 2026-10-16 00:00 |
02:27:30.16 |
-07:49:46.7 |
HIP 11508 |
30.82 |