| 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) |
| 2026-05-12 00:00 |
13:43:03.07 |
+65:42:33.4 |
HIP 67141 |
16.68 |
| 2026-05-12 12:00 |
13:42:58.23 |
+65:42:24.3 |
HIP 67141 |
17.20 |
| 2026-05-13 00:00 |
13:42:53.40 |
+65:42:14.9 |
HIP 67141 |
17.72 |
| 2026-05-13 12:00 |
13:42:48.59 |
+65:42:05.1 |
HIP 67141 |
18.24 |
| 2026-05-14 00:00 |
13:42:43.80 |
+65:41:55.1 |
HIP 67141 |
18.76 |
| 2026-05-14 12:00 |
13:42:39.04 |
+65:41:44.9 |
HIP 67141 |
19.28 |
| 2026-05-15 00:00 |
13:42:34.30 |
+65:41:34.3 |
HIP 67141 |
19.79 |
| 2026-05-15 12:00 |
13:42:29.57 |
+65:41:23.4 |
HIP 67141 |
20.31 |
| 2026-05-16 00:00 |
13:42:24.87 |
+65:41:12.3 |
HIP 67141 |
20.83 |
| 2026-05-16 12:00 |
13:42:20.20 |
+65:41:00.9 |
HIP 67141 |
21.35 |
| 2026-05-17 00:00 |
13:42:15.54 |
+65:40:49.2 |
HIP 67141 |
21.86 |
| 2026-05-17 12:00 |
13:42:10.91 |
+65:40:37.3 |
HIP 67141 |
22.38 |
| 2026-05-18 00:00 |
13:42:06.31 |
+65:40:25.0 |
HIP 67141 |
22.90 |
| 2026-05-18 12:00 |
13:42:01.73 |
+65:40:12.5 |
HIP 67141 |
23.41 |
| 2026-05-19 00:00 |
13:41:57.17 |
+65:39:59.7 |
HIP 66857 |
23.63 |
| 2026-05-19 12:00 |
13:41:52.64 |
+65:39:46.7 |
HIP 66857 |
23.44 |
| 2026-05-20 00:00 |
13:41:48.13 |
+65:39:33.4 |
HIP 66857 |
23.25 |
| 2026-05-20 12:00 |
13:41:43.65 |
+65:39:19.8 |
HIP 66857 |
23.07 |
| 2026-05-21 00:00 |
13:41:39.20 |
+65:39:06.0 |
HIP 66857 |
22.89 |
| 2026-05-21 12:00 |
13:41:34.77 |
+65:38:51.8 |
HIP 66857 |
22.72 |
| 2026-05-22 00:00 |
13:41:30.37 |
+65:38:37.5 |
HIP 66857 |
22.55 |
| 2026-05-22 12:00 |
13:41:25.99 |
+65:38:22.8 |
HIP 66857 |
22.39 |
| 2026-05-23 00:00 |
13:41:21.64 |
+65:38:08.0 |
HIP 66857 |
22.24 |
| 2026-05-23 12:00 |
13:41:17.32 |
+65:37:52.8 |
HIP 66857 |
22.09 |
| 2026-05-24 00:00 |
13:41:13.03 |
+65:37:37.4 |
HIP 66857 |
21.95 |
| 2026-05-24 12:00 |
13:41:08.77 |
+65:37:21.7 |
HIP 66857 |
21.81 |
| 2026-05-25 00:00 |
13:41:04.53 |
+65:37:05.8 |
HIP 66857 |
21.68 |
| 2026-05-25 12:00 |
13:41:00.33 |
+65:36:49.7 |
HIP 66857 |
21.56 |
| 2026-05-26 00:00 |
13:40:56.15 |
+65:36:33.3 |
HIP 66857 |
21.45 |
| 2026-05-26 12:00 |
13:40:52.00 |
+65:36:16.6 |
HIP 66857 |
21.34 |
| 2026-05-27 00:00 |
13:40:47.89 |
+65:35:59.7 |
HIP 66456 |
21.11 |
| 2026-05-27 12:00 |
13:40:43.80 |
+65:35:42.6 |
HIP 66456 |
20.73 |
| 2026-05-28 00:00 |
13:40:39.74 |
+65:35:25.2 |
HIP 66456 |
20.37 |
| 2026-05-28 12:00 |
13:40:35.71 |
+65:35:07.5 |
HIP 66456 |
20.01 |
| 2026-05-29 00:00 |
13:40:31.72 |
+65:34:49.7 |
HIP 66456 |
19.67 |
| 2026-05-29 12:00 |
13:40:27.75 |
+65:34:31.6 |
HIP 66456 |
19.33 |
| 2026-05-30 00:00 |
13:40:23.82 |
+65:34:13.2 |
HIP 66456 |
19.01 |
| 2026-05-30 12:00 |
13:40:19.92 |
+65:33:54.7 |
HIP 66456 |
18.70 |
| 2026-05-31 00:00 |
13:40:16.04 |
+65:33:35.8 |
HIP 66456 |
18.40 |
| 2026-05-31 12:00 |
13:40:12.21 |
+65:33:16.8 |
HIP 66456 |
18.12 |
| 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 |