C/1996 B1 (Szczepanski)
| Parameter |
Value |
| Designation |
C/1996 B1 (Szczepanski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-02-06T21:56:56.152320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
489 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
31.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-02-24.0000000 |
| e |
0.99076543 |
| q (au) |
1.448788 |
| a (au) |
156.887422 |
| i (deg) |
51.918927 |
| Ω (om, deg) |
345.441855 |
| ω (w, deg) |
151.283322 |
| M (ma, deg) |
0.008569 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.421 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.421 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.907 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1996-02-07 |
1996-04-19 |
+1.5930 |
-0.148 |
| 1996-04-19 |
1996-05-22 |
+71.7839 |
-16.863 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:55:30.89 |
-49:16:22.7 |
HIP 108250 |
17.27 |
| 2026-02-03 12:00 |
21:55:34.20 |
-49:16:07.8 |
HIP 108250 |
16.93 |
| 2026-02-04 00:00 |
21:55:37.52 |
-49:15:53.0 |
HIP 108250 |
16.61 |
| 2026-02-04 12:00 |
21:55:40.84 |
-49:15:38.3 |
HIP 108250 |
16.31 |
| 2026-02-05 00:00 |
21:55:44.16 |
-49:15:23.8 |
HIP 108250 |
16.03 |
| 2026-02-05 12:00 |
21:55:47.50 |
-49:15:09.5 |
HIP 108250 |
15.77 |
| 2026-02-06 00:00 |
21:55:50.83 |
-49:14:55.3 |
HIP 108250 |
15.53 |
| 2026-02-06 12:00 |
21:55:54.17 |
-49:14:41.2 |
HIP 108250 |
15.31 |
| 2026-02-07 00:00 |
21:55:57.52 |
-49:14:27.4 |
HIP 108250 |
15.12 |
| 2026-02-07 12:00 |
21:56:00.87 |
-49:14:13.6 |
HIP 108250 |
14.94 |
| 2026-02-08 00:00 |
21:56:04.22 |
-49:14:00.1 |
HIP 108250 |
14.80 |
| 2026-02-08 12:00 |
21:56:07.58 |
-49:13:46.7 |
HIP 108250 |
14.68 |
| 2026-02-09 00:00 |
21:56:10.94 |
-49:13:33.5 |
HIP 108250 |
14.58 |
| 2026-02-09 12:00 |
21:56:14.30 |
-49:13:20.4 |
HIP 108250 |
14.51 |
| 2026-02-10 00:00 |
21:56:17.66 |
-49:13:07.5 |
HIP 108250 |
14.47 |
| 2026-02-10 12:00 |
21:56:21.03 |
-49:12:54.8 |
HIP 108250 |
14.45 |
| 2026-02-11 00:00 |
21:56:24.40 |
-49:12:42.2 |
HIP 108250 |
14.46 |
| 2026-02-11 12:00 |
21:56:27.78 |
-49:12:29.8 |
HIP 108250 |
14.50 |
| 2026-02-12 00:00 |
21:56:31.15 |
-49:12:17.6 |
HIP 108250 |
14.56 |
| 2026-02-12 12:00 |
21:56:34.53 |
-49:12:05.5 |
HIP 108250 |
14.65 |
| 2026-02-13 00:00 |
21:56:37.90 |
-49:11:53.6 |
HIP 108250 |
14.77 |
| 2026-02-13 12:00 |
21:56:41.28 |
-49:11:41.9 |
HIP 108250 |
14.91 |
| 2026-02-14 00:00 |
21:56:44.66 |
-49:11:30.3 |
HIP 108250 |
15.07 |
| 2026-02-14 12:00 |
21:56:48.04 |
-49:11:18.9 |
HIP 108250 |
15.26 |
| 2026-02-15 00:00 |
21:56:51.42 |
-49:11:07.7 |
HIP 108250 |
15.47 |
| 2026-02-15 12:00 |
21:56:54.80 |
-49:10:56.7 |
HIP 108250 |
15.70 |
| 2026-02-16 00:00 |
21:56:58.19 |
-49:10:45.8 |
HIP 108250 |
15.95 |
| 2026-02-16 12:00 |
21:57:01.57 |
-49:10:35.2 |
HIP 108250 |
16.22 |
| 2026-02-17 00:00 |
21:57:04.95 |
-49:10:24.6 |
HIP 108250 |
16.51 |
| 2026-02-17 12:00 |
21:57:08.33 |
-49:10:14.3 |
HIP 108250 |
16.81 |
| 2026-02-18 00:00 |
21:57:11.70 |
-49:10:04.2 |
HIP 108250 |
17.13 |
| 2026-02-18 12:00 |
21:57:15.08 |
-49:09:54.2 |
HIP 108250 |
17.47 |
| 2026-02-19 00:00 |
21:57:18.46 |
-49:09:44.4 |
HIP 108250 |
17.82 |
| 2026-02-19 12:00 |
21:57:21.83 |
-49:09:34.8 |
HIP 108250 |
18.18 |
| 2026-02-20 00:00 |
21:57:25.20 |
-49:09:25.3 |
HIP 108250 |
18.56 |
| 2026-02-20 12:00 |
21:57:28.57 |
-49:09:16.1 |
HIP 108410 |
18.72 |
| 2026-02-21 00:00 |
21:57:31.94 |
-49:09:07.0 |
HIP 108410 |
18.50 |
| 2026-02-21 12:00 |
21:57:35.30 |
-49:08:58.1 |
HIP 108410 |
18.31 |
| 2026-02-22 00:00 |
21:57:38.66 |
-49:08:49.4 |
HIP 108410 |
18.13 |
| 2026-02-22 12:00 |
21:57:42.02 |
-49:08:40.8 |
HIP 108410 |
17.98 |
| 2026-02-23 00:00 |
21:57:45.37 |
-49:08:32.5 |
HIP 108410 |
17.84 |
| 2026-02-23 12:00 |
21:57:48.72 |
-49:08:24.3 |
HIP 108410 |
17.72 |
| 2026-02-24 00:00 |
21:57:52.07 |
-49:08:16.3 |
HIP 108410 |
17.62 |