| 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 |
1996-04-03 |
-0.9314 |
+0.297 |
| 1996-04-03 |
1996-05-22 |
+57.1178 |
-12.969 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
22:03:37.99 |
-49:24:08.5 |
HIP 109093 |
25.44 |
| 2026-05-12 12:00 |
22:03:38.50 |
-49:24:26.8 |
HIP 109093 |
25.22 |
| 2026-05-13 00:00 |
22:03:38.99 |
-49:24:45.3 |
HIP 109093 |
25.01 |
| 2026-05-13 12:00 |
22:03:39.45 |
-49:25:03.8 |
HIP 109093 |
24.80 |
| 2026-05-14 00:00 |
22:03:39.88 |
-49:25:22.5 |
HIP 109093 |
24.60 |
| 2026-05-14 12:00 |
22:03:40.29 |
-49:25:41.3 |
HIP 109093 |
24.41 |
| 2026-05-15 00:00 |
22:03:40.66 |
-49:26:00.2 |
HIP 109093 |
24.22 |
| 2026-05-15 12:00 |
22:03:41.01 |
-49:26:19.1 |
HIP 109093 |
24.04 |
| 2026-05-16 00:00 |
22:03:41.33 |
-49:26:38.2 |
HIP 109093 |
23.86 |
| 2026-05-16 12:00 |
22:03:41.62 |
-49:26:57.4 |
HIP 109093 |
23.69 |
| 2026-05-17 00:00 |
22:03:41.88 |
-49:27:16.7 |
HIP 109093 |
23.53 |
| 2026-05-17 12:00 |
22:03:42.12 |
-49:27:36.0 |
HIP 109093 |
23.37 |
| 2026-05-18 00:00 |
22:03:42.32 |
-49:27:55.5 |
HIP 109093 |
23.23 |
| 2026-05-18 12:00 |
22:03:42.50 |
-49:28:15.0 |
HIP 109093 |
23.09 |
| 2026-05-19 00:00 |
22:03:42.65 |
-49:28:34.7 |
HIP 109093 |
22.95 |
| 2026-05-19 12:00 |
22:03:42.77 |
-49:28:54.4 |
HIP 109093 |
22.83 |
| 2026-05-20 00:00 |
22:03:42.87 |
-49:29:14.2 |
HIP 109093 |
22.71 |
| 2026-05-20 12:00 |
22:03:42.93 |
-49:29:34.1 |
HIP 109093 |
22.60 |
| 2026-05-21 00:00 |
22:03:42.97 |
-49:29:54.1 |
HIP 109093 |
22.50 |
| 2026-05-21 12:00 |
22:03:42.98 |
-49:30:14.2 |
HIP 109093 |
22.41 |
| 2026-05-22 00:00 |
22:03:42.96 |
-49:30:34.3 |
HIP 109093 |
22.33 |
| 2026-05-22 12:00 |
22:03:42.91 |
-49:30:54.5 |
HIP 109093 |
22.25 |
| 2026-05-23 00:00 |
22:03:42.83 |
-49:31:14.8 |
HIP 109093 |
22.19 |
| 2026-05-23 12:00 |
22:03:42.73 |
-49:31:35.2 |
HIP 109093 |
22.13 |
| 2026-05-24 00:00 |
22:03:42.60 |
-49:31:55.7 |
HIP 109093 |
22.08 |
| 2026-05-24 12:00 |
22:03:42.44 |
-49:32:16.2 |
HIP 109093 |
22.05 |
| 2026-05-25 00:00 |
22:03:42.25 |
-49:32:36.8 |
HIP 109093 |
22.02 |
| 2026-05-25 12:00 |
22:03:42.03 |
-49:32:57.4 |
HIP 109093 |
22.00 |
| 2026-05-26 00:00 |
22:03:41.79 |
-49:33:18.2 |
HIP 109093 |
21.99 |
| 2026-05-26 12:00 |
22:03:41.51 |
-49:33:38.9 |
HIP 109093 |
21.99 |
| 2026-05-27 00:00 |
22:03:41.21 |
-49:33:59.8 |
HIP 109093 |
22.01 |
| 2026-05-27 12:00 |
22:03:40.88 |
-49:34:20.7 |
HIP 109093 |
22.03 |
| 2026-05-28 00:00 |
22:03:40.53 |
-49:34:41.7 |
HIP 109093 |
22.06 |
| 2026-05-28 12:00 |
22:03:40.14 |
-49:35:02.7 |
HIP 109093 |
22.10 |
| 2026-05-29 00:00 |
22:03:39.73 |
-49:35:23.8 |
HIP 109093 |
22.15 |
| 2026-05-29 12:00 |
22:03:39.29 |
-49:35:45.0 |
HIP 109093 |
22.21 |
| 2026-05-30 00:00 |
22:03:38.82 |
-49:36:06.2 |
HIP 109093 |
22.29 |
| 2026-05-30 12:00 |
22:03:38.32 |
-49:36:27.4 |
HIP 109093 |
22.37 |
| 2026-05-31 00:00 |
22:03:37.80 |
-49:36:48.8 |
HIP 109093 |
22.46 |
| 2026-05-31 12:00 |
22:03:37.25 |
-49:37:10.1 |
HIP 109093 |
22.56 |
| 2026-06-01 00:00 |
22:03:36.67 |
-49:37:31.5 |
HIP 109093 |
22.68 |
| 2026-06-01 12:00 |
22:03:36.06 |
-49:37:53.0 |
HIP 109093 |
22.80 |
| 2026-06-02 00:00 |
22:03:35.42 |
-49:38:14.5 |
HIP 109093 |
22.93 |