| Parameter |
Value |
| Designation |
C/1992 Q2 (Helin-Lawrence) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1993-03-15T02:37:57.362880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
86 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
15.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1993-02-15.0000000 |
| e |
0.96541828 |
| q (au) |
2.038458 |
| a (au) |
58.946112 |
| i (deg) |
106.848257 |
| Ω (om, deg) |
194.667114 |
| ω (w, deg) |
268.852796 |
| M (ma, deg) |
359.938782 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.372 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.372 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.705 |
| k |
0.800 |
| δ90 |
10.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
13:40:08.40 |
+65:32:57.5 |
HIP 66456 |
17.85 |
| 2026-06-01 12:00 |
13:40:04.63 |
+65:32:38.0 |
HIP 66456 |
17.60 |
| 2026-06-02 00:00 |
13:40:00.89 |
+65:32:18.3 |
HIP 66456 |
17.36 |
| 2026-06-02 12:00 |
13:39:57.18 |
+65:31:58.4 |
HIP 66456 |
17.14 |
| 2026-06-03 00:00 |
13:39:53.50 |
+65:31:38.2 |
HIP 66456 |
16.93 |
| 2026-06-03 12:00 |
13:39:49.86 |
+65:31:17.8 |
HIP 66456 |
16.74 |
| 2026-06-04 00:00 |
13:39:46.25 |
+65:30:57.2 |
HIP 66456 |
16.57 |
| 2026-06-04 12:00 |
13:39:42.68 |
+65:30:36.4 |
HIP 66456 |
16.42 |
| 2026-06-05 00:00 |
13:39:39.14 |
+65:30:15.3 |
HIP 66456 |
16.29 |
| 2026-06-05 12:00 |
13:39:35.64 |
+65:29:54.0 |
HIP 66456 |
16.18 |
| 2026-06-06 00:00 |
13:39:32.17 |
+65:29:32.6 |
HIP 66456 |
16.09 |
| 2026-06-06 12:00 |
13:39:28.73 |
+65:29:10.9 |
HIP 66456 |
16.01 |
| 2026-06-07 00:00 |
13:39:25.33 |
+65:28:49.0 |
HIP 66456 |
15.96 |
| 2026-06-07 12:00 |
13:39:21.97 |
+65:28:26.9 |
HIP 66456 |
15.93 |
| 2026-06-08 00:00 |
13:39:18.64 |
+65:28:04.6 |
HIP 66456 |
15.92 |
| 2026-06-08 12:00 |
13:39:15.35 |
+65:27:42.1 |
HIP 66456 |
15.94 |
| 2026-06-09 00:00 |
13:39:12.09 |
+65:27:19.3 |
HIP 66456 |
15.97 |
| 2026-06-09 12:00 |
13:39:08.87 |
+65:26:56.4 |
HIP 66456 |
16.02 |
| 2026-06-10 00:00 |
13:39:05.69 |
+65:26:33.3 |
HIP 66456 |
16.10 |
| 2026-06-10 12:00 |
13:39:02.54 |
+65:26:10.0 |
HIP 66456 |
16.19 |
| 2026-06-11 00:00 |
13:38:59.43 |
+65:25:46.5 |
HIP 66456 |
16.31 |
| 2026-06-11 12:00 |
13:38:56.36 |
+65:25:22.8 |
HIP 66456 |
16.44 |
| 2026-06-12 00:00 |
13:38:53.32 |
+65:24:58.9 |
HIP 66456 |
16.59 |
| 2026-06-12 12:00 |
13:38:50.33 |
+65:24:34.8 |
HIP 66456 |
16.77 |
| 2026-06-13 00:00 |
13:38:47.37 |
+65:24:10.5 |
HIP 66456 |
16.96 |
| 2026-06-13 12:00 |
13:38:44.45 |
+65:23:46.0 |
HIP 66456 |
17.16 |
| 2026-06-14 00:00 |
13:38:41.56 |
+65:23:21.4 |
HIP 66456 |
17.39 |
| 2026-06-14 12:00 |
13:38:38.72 |
+65:22:56.6 |
HIP 66456 |
17.63 |
| 2026-06-15 00:00 |
13:38:35.91 |
+65:22:31.6 |
HIP 66456 |
17.89 |
| 2026-06-15 12:00 |
13:38:33.15 |
+65:22:06.4 |
HIP 66456 |
18.16 |
| 2026-06-16 00:00 |
13:38:30.42 |
+65:21:41.0 |
HIP 66456 |
18.44 |
| 2026-06-16 12:00 |
13:38:27.73 |
+65:21:15.5 |
HIP 66456 |
18.74 |
| 2026-06-17 00:00 |
13:38:25.08 |
+65:20:49.8 |
HIP 66456 |
19.05 |
| 2026-06-17 12:00 |
13:38:22.48 |
+65:20:23.9 |
HIP 66456 |
19.38 |
| 2026-06-18 00:00 |
13:38:19.91 |
+65:19:57.9 |
HIP 66456 |
19.71 |
| 2026-06-18 12:00 |
13:38:17.38 |
+65:19:31.7 |
HIP 66456 |
20.06 |
| 2026-06-19 00:00 |
13:38:14.89 |
+65:19:05.3 |
HIP 66456 |
20.41 |
| 2026-06-19 12:00 |
13:38:12.44 |
+65:18:38.8 |
HIP 66456 |
20.78 |
| 2026-06-20 00:00 |
13:38:10.03 |
+65:18:12.2 |
HIP 66263 |
21.07 |
| 2026-06-20 12:00 |
13:38:07.67 |
+65:17:45.3 |
HIP 66263 |
20.77 |
| 2026-06-21 00:00 |
13:38:05.34 |
+65:17:18.4 |
HIP 66263 |
20.49 |
| 2026-06-21 12:00 |
13:38:03.05 |
+65:16:51.2 |
HIP 66263 |
20.21 |
| 2026-06-22 00:00 |
13:38:00.81 |
+65:16:24.0 |
HIP 66263 |
19.95 |