| 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) |
| 2026-06-01 00:00 |
00:30:55.37 |
-44:59:04.0 |
HIP 2284 |
19.01 |
| 2026-06-01 12:00 |
00:30:56.65 |
-44:59:22.4 |
HIP 2284 |
19.16 |
| 2026-06-02 00:00 |
00:30:57.90 |
-44:59:41.1 |
HIP 2284 |
19.31 |
| 2026-06-02 12:00 |
00:30:59.14 |
-45:00:00.0 |
HIP 2284 |
19.46 |
| 2026-06-03 00:00 |
00:31:00.36 |
-45:00:18.9 |
HIP 2284 |
19.62 |
| 2026-06-03 12:00 |
00:31:01.55 |
-45:00:38.0 |
HIP 2284 |
19.78 |
| 2026-06-04 00:00 |
00:31:02.72 |
-45:00:57.3 |
HIP 2284 |
19.94 |
| 2026-06-04 12:00 |
00:31:03.88 |
-45:01:16.7 |
HIP 2284 |
20.10 |
| 2026-06-05 00:00 |
00:31:05.01 |
-45:01:36.3 |
HIP 2284 |
20.26 |
| 2026-06-05 12:00 |
00:31:06.12 |
-45:01:56.0 |
HIP 2284 |
20.43 |
| 2026-06-06 00:00 |
00:31:07.21 |
-45:02:15.9 |
HIP 2284 |
20.59 |
| 2026-06-06 12:00 |
00:31:08.28 |
-45:02:35.9 |
HIP 2284 |
20.76 |
| 2026-06-07 00:00 |
00:31:09.33 |
-45:02:56.1 |
HIP 2284 |
20.94 |
| 2026-06-07 12:00 |
00:31:10.36 |
-45:03:16.4 |
HIP 2284 |
21.11 |
| 2026-06-08 00:00 |
00:31:11.36 |
-45:03:36.9 |
HIP 2284 |
21.28 |
| 2026-06-08 12:00 |
00:31:12.35 |
-45:03:57.5 |
HIP 2284 |
21.46 |
| 2026-06-09 00:00 |
00:31:13.31 |
-45:04:18.3 |
HIP 2284 |
21.64 |
| 2026-06-09 12:00 |
00:31:14.25 |
-45:04:39.2 |
HIP 2284 |
21.82 |
| 2026-06-10 00:00 |
00:31:15.17 |
-45:05:00.2 |
HIP 2284 |
22.00 |
| 2026-06-10 12:00 |
00:31:16.07 |
-45:05:21.4 |
HIP 2284 |
22.18 |
| 2026-06-11 00:00 |
00:31:16.94 |
-45:05:42.8 |
HIP 2284 |
22.36 |
| 2026-06-11 12:00 |
00:31:17.79 |
-45:06:04.2 |
HIP 2284 |
22.55 |
| 2026-06-12 00:00 |
00:31:18.63 |
-45:06:25.8 |
HIP 2284 |
22.74 |
| 2026-06-12 12:00 |
00:31:19.43 |
-45:06:47.6 |
HIP 2284 |
22.93 |
| 2026-06-13 00:00 |
00:31:20.22 |
-45:07:09.4 |
HIP 2284 |
23.12 |
| 2026-06-13 12:00 |
00:31:20.98 |
-45:07:31.4 |
HIP 2284 |
23.31 |
| 2026-06-14 00:00 |
00:31:21.73 |
-45:07:53.5 |
HIP 2284 |
23.50 |
| 2026-06-14 12:00 |
00:31:22.45 |
-45:08:15.8 |
HIP 2284 |
23.70 |
| 2026-06-15 00:00 |
00:31:23.14 |
-45:08:38.2 |
HIP 2284 |
23.89 |
| 2026-06-15 12:00 |
00:31:23.82 |
-45:09:00.7 |
HIP 2284 |
24.09 |
| 2026-06-16 00:00 |
00:31:24.47 |
-45:09:23.3 |
HIP 2284 |
24.29 |
| 2026-06-16 12:00 |
00:31:25.10 |
-45:09:46.1 |
HIP 2284 |
24.49 |
| 2026-06-17 00:00 |
00:31:25.70 |
-45:10:09.0 |
HIP 2284 |
24.69 |
| 2026-06-17 12:00 |
00:31:26.28 |
-45:10:31.9 |
HIP 2284 |
24.89 |
| 2026-06-18 00:00 |
00:31:26.84 |
-45:10:55.1 |
HIP 2284 |
25.09 |
| 2026-06-18 12:00 |
00:31:27.38 |
-45:11:18.3 |
HIP 2284 |
25.30 |
| 2026-06-19 00:00 |
00:31:27.89 |
-45:11:41.6 |
HIP 2284 |
25.50 |
| 2026-06-19 12:00 |
00:31:28.38 |
-45:12:05.1 |
HIP 2284 |
25.71 |
| 2026-06-20 00:00 |
00:31:28.85 |
-45:12:28.6 |
HIP 2284 |
25.92 |
| 2026-06-20 12:00 |
00:31:29.29 |
-45:12:52.3 |
HIP 2284 |
26.13 |
| 2026-06-21 00:00 |
00:31:29.72 |
-45:13:16.1 |
HIP 2284 |
26.34 |
| 2026-06-21 12:00 |
00:31:30.11 |
-45:13:40.0 |
HIP 2284 |
26.56 |
| 2026-06-22 00:00 |
00:31:30.49 |
-45:14:04.0 |
HIP 2284 |
26.77 |