C/1992 J1 (Spacewatch)
| Parameter |
Value |
| Designation |
C/1992 J1 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1993-09-05T13:00:26.484480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
240 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1993-08-03.0000000 |
| e |
0.99997349 |
| q (au) |
3.007011 |
| a (au) |
113435.213728 |
| i (deg) |
124.318754 |
| Ω (om, deg) |
203.324133 |
| ω (w, deg) |
83.399442 |
| M (ma, deg) |
359.999999 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.325 + 4.889\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.325 |
| n |
4.889 |
| gf |
0.999 |
| gb |
-0.767 |
| k |
0.993 |
| δ90 |
9.998 |
| 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 |
00:21:50.76 |
-45:15:36.4 |
HIP 1814 |
18.30 |
| 2026-02-03 12:00 |
00:21:52.47 |
-45:15:13.2 |
HIP 1814 |
18.39 |
| 2026-02-04 00:00 |
00:21:54.19 |
-45:14:50.1 |
HIP 1820 |
18.21 |
| 2026-02-04 12:00 |
00:21:55.94 |
-45:14:27.2 |
HIP 1820 |
17.72 |
| 2026-02-05 00:00 |
00:21:57.70 |
-45:14:04.2 |
HIP 1820 |
17.22 |
| 2026-02-05 12:00 |
00:21:59.48 |
-45:13:41.4 |
HIP 1820 |
16.73 |
| 2026-02-06 00:00 |
00:22:01.27 |
-45:13:18.6 |
HIP 1820 |
16.24 |
| 2026-02-06 12:00 |
00:22:03.09 |
-45:12:56.0 |
HIP 1820 |
15.74 |
| 2026-02-07 00:00 |
00:22:04.92 |
-45:12:33.4 |
HIP 1820 |
15.25 |
| 2026-02-07 12:00 |
00:22:06.78 |
-45:12:10.9 |
HIP 1820 |
14.75 |
| 2026-02-08 00:00 |
00:22:08.65 |
-45:11:48.4 |
HIP 1820 |
14.25 |
| 2026-02-08 12:00 |
00:22:10.53 |
-45:11:26.1 |
HIP 1820 |
13.76 |
| 2026-02-09 00:00 |
00:22:12.44 |
-45:11:03.8 |
HIP 1820 |
13.26 |
| 2026-02-09 12:00 |
00:22:14.36 |
-45:10:41.7 |
HIP 1820 |
12.75 |
| 2026-02-10 00:00 |
00:22:16.30 |
-45:10:19.6 |
HIP 1820 |
12.25 |
| 2026-02-10 12:00 |
00:22:18.26 |
-45:09:57.7 |
HIP 1820 |
11.75 |
| 2026-02-11 00:00 |
00:22:20.23 |
-45:09:35.8 |
HIP 1820 |
11.25 |
| 2026-02-11 12:00 |
00:22:22.22 |
-45:09:14.0 |
HIP 1820 |
10.74 |
| 2026-02-12 00:00 |
00:22:24.22 |
-45:08:52.3 |
HIP 1820 |
10.24 |
| 2026-02-12 12:00 |
00:22:26.25 |
-45:08:30.8 |
HIP 1820 |
9.73 |
| 2026-02-13 00:00 |
00:22:28.29 |
-45:08:09.3 |
HIP 1820 |
9.22 |
| 2026-02-13 12:00 |
00:22:30.34 |
-45:07:47.9 |
HIP 1820 |
8.71 |
| 2026-02-14 00:00 |
00:22:32.41 |
-45:07:26.7 |
HIP 1820 |
8.21 |
| 2026-02-14 12:00 |
00:22:34.50 |
-45:07:05.5 |
HIP 1820 |
7.70 |
| 2026-02-15 00:00 |
00:22:36.60 |
-45:06:44.5 |
HIP 1820 |
7.19 |
| 2026-02-15 12:00 |
00:22:38.72 |
-45:06:23.6 |
HIP 1820 |
6.68 |
| 2026-02-16 00:00 |
00:22:40.85 |
-45:06:02.7 |
HIP 1820 |
6.17 |
| 2026-02-16 12:00 |
00:22:43.00 |
-45:05:42.0 |
HIP 1820 |
5.66 |
| 2026-02-17 00:00 |
00:22:45.16 |
-45:05:21.5 |
HIP 1820 |
5.15 |
| 2026-02-17 12:00 |
00:22:47.34 |
-45:05:01.0 |
HIP 1820 |
4.64 |
| 2026-02-18 00:00 |
00:22:49.53 |
-45:04:40.7 |
HIP 1820 |
4.14 |
| 2026-02-18 12:00 |
00:22:51.73 |
-45:04:20.4 |
HIP 1820 |
3.63 |
| 2026-02-19 00:00 |
00:22:53.95 |
-45:04:00.3 |
HIP 1820 |
3.13 |
| 2026-02-19 12:00 |
00:22:56.19 |
-45:03:40.4 |
HIP 1820 |
2.64 |
| 2026-02-20 00:00 |
00:22:58.43 |
-45:03:20.5 |
HIP 1820 |
2.16 |
| 2026-02-20 12:00 |
00:23:00.70 |
-45:03:00.8 |
HIP 1820 |
1.69 |
| 2026-02-21 00:00 |
00:23:02.97 |
-45:02:41.2 |
HIP 1820 |
1.28 |
| 2026-02-21 12:00 |
00:23:05.26 |
-45:02:21.7 |
HIP 1820 |
0.97 |
| 2026-02-22 00:00 |
00:23:07.56 |
-45:02:02.4 |
HIP 1820 |
0.88 |
| 2026-02-22 12:00 |
00:23:09.87 |
-45:01:43.2 |
HIP 1820 |
1.08 |
| 2026-02-23 00:00 |
00:23:12.20 |
-45:01:24.2 |
HIP 1820 |
1.45 |
| 2026-02-23 12:00 |
00:23:14.54 |
-45:01:05.2 |
HIP 1820 |
1.89 |
| 2026-02-24 00:00 |
00:23:16.89 |
-45:00:46.5 |
HIP 1820 |
2.37 |