| 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 |
0.999 |
| gb |
-0.500 |
| 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) |
| 2026-06-01 00:00 |
22:04:14.59 |
+45:09:10.5 |
HIP 109079 |
17.08 |
| 2026-06-01 12:00 |
22:04:14.03 |
+45:09:35.2 |
HIP 109079 |
17.24 |
| 2026-06-02 00:00 |
22:04:13.44 |
+45:09:59.8 |
HIP 109079 |
17.41 |
| 2026-06-02 12:00 |
22:04:12.82 |
+45:10:24.3 |
HIP 109079 |
17.60 |
| 2026-06-03 00:00 |
22:04:12.19 |
+45:10:48.7 |
HIP 109079 |
17.79 |
| 2026-06-03 12:00 |
22:04:11.53 |
+45:11:13.0 |
HIP 109079 |
18.00 |
| 2026-06-04 00:00 |
22:04:10.84 |
+45:11:37.2 |
HIP 109079 |
18.22 |
| 2026-06-04 12:00 |
22:04:10.13 |
+45:12:01.3 |
HIP 109079 |
18.45 |
| 2026-06-05 00:00 |
22:04:09.40 |
+45:12:25.3 |
HIP 109079 |
18.69 |
| 2026-06-05 12:00 |
22:04:08.64 |
+45:12:49.2 |
HIP 109079 |
18.94 |
| 2026-06-06 00:00 |
22:04:07.86 |
+45:13:13.0 |
HIP 109079 |
19.20 |
| 2026-06-06 12:00 |
22:04:07.06 |
+45:13:36.7 |
HIP 109079 |
19.47 |
| 2026-06-07 00:00 |
22:04:06.24 |
+45:14:00.3 |
HIP 109079 |
19.75 |
| 2026-06-07 12:00 |
22:04:05.38 |
+45:14:23.7 |
HIP 109079 |
20.03 |
| 2026-06-08 00:00 |
22:04:04.51 |
+45:14:47.1 |
HIP 109085 |
20.31 |
| 2026-06-08 12:00 |
22:04:03.61 |
+45:15:10.3 |
HIP 108892 |
19.96 |
| 2026-06-09 00:00 |
22:04:02.69 |
+45:15:33.4 |
HIP 108892 |
19.54 |
| 2026-06-09 12:00 |
22:04:01.75 |
+45:15:56.4 |
HIP 108892 |
19.13 |
| 2026-06-10 00:00 |
22:04:00.78 |
+45:16:19.3 |
HIP 108892 |
18.71 |
| 2026-06-10 12:00 |
22:03:59.79 |
+45:16:42.0 |
HIP 108892 |
18.30 |
| 2026-06-11 00:00 |
22:03:58.78 |
+45:17:04.6 |
HIP 108892 |
17.88 |
| 2026-06-11 12:00 |
22:03:57.74 |
+45:17:27.1 |
HIP 108892 |
17.47 |
| 2026-06-12 00:00 |
22:03:56.68 |
+45:17:49.5 |
HIP 108892 |
17.06 |
| 2026-06-12 12:00 |
22:03:55.60 |
+45:18:11.7 |
HIP 108892 |
16.65 |
| 2026-06-13 00:00 |
22:03:54.49 |
+45:18:33.8 |
HIP 108892 |
16.24 |
| 2026-06-13 12:00 |
22:03:53.36 |
+45:18:55.8 |
HIP 108892 |
15.83 |
| 2026-06-14 00:00 |
22:03:52.21 |
+45:19:17.6 |
HIP 108892 |
15.43 |
| 2026-06-14 12:00 |
22:03:51.03 |
+45:19:39.3 |
HIP 108892 |
15.02 |
| 2026-06-15 00:00 |
22:03:49.84 |
+45:20:00.8 |
HIP 108892 |
14.62 |
| 2026-06-15 12:00 |
22:03:48.62 |
+45:20:22.2 |
HIP 108892 |
14.22 |
| 2026-06-16 00:00 |
22:03:47.37 |
+45:20:43.5 |
HIP 108892 |
13.82 |
| 2026-06-16 12:00 |
22:03:46.11 |
+45:21:04.6 |
HIP 108892 |
13.43 |
| 2026-06-17 00:00 |
22:03:44.82 |
+45:21:25.6 |
HIP 108892 |
13.04 |
| 2026-06-17 12:00 |
22:03:43.51 |
+45:21:46.4 |
HIP 108892 |
12.65 |
| 2026-06-18 00:00 |
22:03:42.18 |
+45:22:07.1 |
HIP 108892 |
12.26 |
| 2026-06-18 12:00 |
22:03:40.82 |
+45:22:27.6 |
HIP 108892 |
11.88 |
| 2026-06-19 00:00 |
22:03:39.45 |
+45:22:48.0 |
HIP 108892 |
11.50 |
| 2026-06-19 12:00 |
22:03:38.05 |
+45:23:08.2 |
HIP 108892 |
11.13 |
| 2026-06-20 00:00 |
22:03:36.63 |
+45:23:28.2 |
HIP 108892 |
10.76 |
| 2026-06-20 12:00 |
22:03:35.19 |
+45:23:48.1 |
HIP 108892 |
10.40 |
| 2026-06-21 00:00 |
22:03:33.73 |
+45:24:07.9 |
HIP 108892 |
10.04 |
| 2026-06-21 12:00 |
22:03:32.24 |
+45:24:27.5 |
HIP 108892 |
9.69 |
| 2026-06-22 00:00 |
22:03:30.74 |
+45:24:46.9 |
HIP 108892 |
9.35 |