C/1992 W1 (Ohshita)
| Parameter |
Value |
| Designation |
C/1992 W1 (Ohshita) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-11-01T14:50:48.024960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
20.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1992-12-18.0000000 |
| e |
0.99301266 |
| q (au) |
0.664826 |
| a (au) |
95.147254 |
| i (deg) |
115.137808 |
| Ω (om, deg) |
138.404186 |
| ω (w, deg) |
310.170779 |
| M (ma, deg) |
0.049255 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.403 + 3.249\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.403 |
| n |
3.249 |
| gf |
0.992 |
| gb |
-0.649 |
| k |
1.000 |
| δ90 |
2.347 |
| 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 |
21:57:25.97 |
+43:54:57.6 |
HIP 108465 |
17.20 |
| 2026-02-03 12:00 |
21:57:28.77 |
+43:54:56.7 |
HIP 108465 |
16.92 |
| 2026-02-04 00:00 |
21:57:31.57 |
+43:54:55.9 |
HIP 108465 |
16.64 |
| 2026-02-04 12:00 |
21:57:34.38 |
+43:54:55.4 |
HIP 108465 |
16.37 |
| 2026-02-05 00:00 |
21:57:37.19 |
+43:54:55.1 |
HIP 108465 |
16.11 |
| 2026-02-05 12:00 |
21:57:40.01 |
+43:54:55.1 |
HIP 108465 |
15.86 |
| 2026-02-06 00:00 |
21:57:42.83 |
+43:54:55.3 |
HIP 108465 |
15.61 |
| 2026-02-06 12:00 |
21:57:45.66 |
+43:54:55.8 |
HIP 108465 |
15.38 |
| 2026-02-07 00:00 |
21:57:48.49 |
+43:54:56.5 |
HIP 108465 |
15.15 |
| 2026-02-07 12:00 |
21:57:51.32 |
+43:54:57.5 |
HIP 108465 |
14.93 |
| 2026-02-08 00:00 |
21:57:54.16 |
+43:54:58.6 |
HIP 108465 |
14.72 |
| 2026-02-08 12:00 |
21:57:57.00 |
+43:55:00.1 |
HIP 108465 |
14.53 |
| 2026-02-09 00:00 |
21:57:59.84 |
+43:55:01.7 |
HIP 108465 |
14.34 |
| 2026-02-09 12:00 |
21:58:02.68 |
+43:55:03.7 |
HIP 108465 |
14.17 |
| 2026-02-10 00:00 |
21:58:05.53 |
+43:55:05.8 |
HIP 108465 |
14.01 |
| 2026-02-10 12:00 |
21:58:08.39 |
+43:55:08.2 |
HIP 108465 |
13.87 |
| 2026-02-11 00:00 |
21:58:11.24 |
+43:55:10.8 |
HIP 108465 |
13.73 |
| 2026-02-11 12:00 |
21:58:14.09 |
+43:55:13.7 |
HIP 108465 |
13.62 |
| 2026-02-12 00:00 |
21:58:16.95 |
+43:55:16.8 |
HIP 108465 |
13.51 |
| 2026-02-12 12:00 |
21:58:19.81 |
+43:55:20.2 |
HIP 108465 |
13.42 |
| 2026-02-13 00:00 |
21:58:22.67 |
+43:55:23.8 |
HIP 108465 |
13.35 |
| 2026-02-13 12:00 |
21:58:25.53 |
+43:55:27.6 |
HIP 108465 |
13.29 |
| 2026-02-14 00:00 |
21:58:28.40 |
+43:55:31.7 |
HIP 108465 |
13.25 |
| 2026-02-14 12:00 |
21:58:31.26 |
+43:55:36.0 |
HIP 108465 |
13.22 |
| 2026-02-15 00:00 |
21:58:34.13 |
+43:55:40.5 |
HIP 108465 |
13.22 |
| 2026-02-15 12:00 |
21:58:36.99 |
+43:55:45.3 |
HIP 108465 |
13.22 |
| 2026-02-16 00:00 |
21:58:39.86 |
+43:55:50.3 |
HIP 108465 |
13.25 |
| 2026-02-16 12:00 |
21:58:42.72 |
+43:55:55.6 |
HIP 108465 |
13.29 |
| 2026-02-17 00:00 |
21:58:45.59 |
+43:56:01.1 |
HIP 108465 |
13.35 |
| 2026-02-17 12:00 |
21:58:48.45 |
+43:56:06.8 |
HIP 108465 |
13.42 |
| 2026-02-18 00:00 |
21:58:51.32 |
+43:56:12.8 |
HIP 108465 |
13.51 |
| 2026-02-18 12:00 |
21:58:54.18 |
+43:56:19.0 |
HIP 108465 |
13.62 |
| 2026-02-19 00:00 |
21:58:57.04 |
+43:56:25.4 |
HIP 108465 |
13.74 |
| 2026-02-19 12:00 |
21:58:59.90 |
+43:56:32.1 |
HIP 108465 |
13.88 |
| 2026-02-20 00:00 |
21:59:02.76 |
+43:56:38.9 |
HIP 108465 |
14.03 |
| 2026-02-20 12:00 |
21:59:05.62 |
+43:56:46.1 |
HIP 108465 |
14.20 |
| 2026-02-21 00:00 |
21:59:08.47 |
+43:56:53.4 |
HIP 108465 |
14.38 |
| 2026-02-21 12:00 |
21:59:11.33 |
+43:57:01.0 |
HIP 108465 |
14.57 |
| 2026-02-22 00:00 |
21:59:14.18 |
+43:57:08.8 |
HIP 108465 |
14.78 |
| 2026-02-22 12:00 |
21:59:17.03 |
+43:57:16.8 |
HIP 108465 |
15.00 |
| 2026-02-23 00:00 |
21:59:19.87 |
+43:57:25.1 |
HIP 108465 |
15.23 |
| 2026-02-23 12:00 |
21:59:22.71 |
+43:57:33.6 |
HIP 108465 |
15.47 |
| 2026-02-24 00:00 |
21:59:25.55 |
+43:57:42.3 |
HIP 108645 |
15.39 |