| 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) |
| 2026-07-29 00:00 |
13:37:11.76 |
+64:38:31.9 |
HIP 66798 |
29.58 |
| 2026-07-29 12:00 |
13:37:12.69 |
+64:38:00.0 |
HIP 66798 |
29.70 |
| 2026-07-30 00:00 |
13:37:13.65 |
+64:37:28.0 |
HIP 66798 |
29.81 |
| 2026-07-30 12:00 |
13:37:14.66 |
+64:36:56.1 |
HIP 66798 |
29.94 |
| 2026-07-31 00:00 |
13:37:15.70 |
+64:36:24.2 |
HIP 66798 |
30.06 |
| 2026-07-31 12:00 |
13:37:16.79 |
+64:35:52.3 |
HIP 66798 |
30.20 |
| 2026-08-01 00:00 |
13:37:17.92 |
+64:35:20.5 |
HIP 66798 |
30.33 |
| 2026-08-01 12:00 |
13:37:19.08 |
+64:34:48.7 |
HIP 66798 |
30.48 |
| 2026-08-02 00:00 |
13:37:20.29 |
+64:34:17.0 |
HIP 66798 |
30.62 |
| 2026-08-02 12:00 |
13:37:21.54 |
+64:33:45.3 |
HIP 66798 |
30.77 |
| 2026-08-03 00:00 |
13:37:22.83 |
+64:33:13.6 |
HIP 66798 |
30.93 |
| 2026-08-03 12:00 |
13:37:24.16 |
+64:32:42.0 |
HIP 66798 |
31.09 |
| 2026-08-04 00:00 |
13:37:25.52 |
+64:32:10.4 |
HIP 66798 |
31.26 |
| 2026-08-04 12:00 |
13:37:26.93 |
+64:31:38.8 |
HIP 66798 |
31.43 |
| 2026-08-05 00:00 |
13:37:28.38 |
+64:31:07.3 |
HIP 66798 |
31.61 |
| 2026-08-05 12:00 |
13:37:29.86 |
+64:30:35.9 |
HIP 66798 |
31.79 |
| 2026-08-06 00:00 |
13:37:31.39 |
+64:30:04.5 |
HIP 66798 |
31.97 |
| 2026-08-06 12:00 |
13:37:32.95 |
+64:29:33.2 |
HIP 66798 |
32.16 |
| 2026-08-07 00:00 |
13:37:34.56 |
+64:29:01.9 |
HIP 66798 |
32.35 |
| 2026-08-07 12:00 |
13:37:36.20 |
+64:28:30.7 |
HIP 66798 |
32.55 |
| 2026-08-08 00:00 |
13:37:37.88 |
+64:27:59.6 |
HIP 66798 |
32.75 |
| 2026-08-08 12:00 |
13:37:39.60 |
+64:27:28.5 |
HIP 66798 |
32.95 |
| 2026-08-09 00:00 |
13:37:41.36 |
+64:26:57.5 |
HIP 66798 |
33.16 |
| 2026-08-09 12:00 |
13:37:43.16 |
+64:26:26.5 |
HIP 66798 |
33.38 |
| 2026-08-10 00:00 |
13:37:45.00 |
+64:25:55.6 |
HIP 66798 |
33.59 |
| 2026-08-10 12:00 |
13:37:46.88 |
+64:25:24.8 |
HIP 66798 |
33.81 |
| 2026-08-11 00:00 |
13:37:48.79 |
+64:24:54.1 |
HIP 66798 |
34.04 |
| 2026-08-11 12:00 |
13:37:50.74 |
+64:24:23.5 |
HIP 66798 |
34.26 |
| 2026-08-12 00:00 |
13:37:52.73 |
+64:23:52.9 |
HIP 66798 |
34.50 |
| 2026-08-12 12:00 |
13:37:54.76 |
+64:23:22.4 |
HIP 66798 |
34.73 |
| 2026-08-13 00:00 |
13:37:56.82 |
+64:22:52.0 |
HIP 66798 |
34.97 |
| 2026-08-13 12:00 |
13:37:58.92 |
+64:22:21.7 |
HIP 66798 |
35.21 |
| 2026-08-14 00:00 |
13:38:01.06 |
+64:21:51.5 |
HIP 66798 |
35.45 |
| 2026-08-14 12:00 |
13:38:03.24 |
+64:21:21.3 |
HIP 66769 |
35.57 |
| 2026-08-15 00:00 |
13:38:05.45 |
+64:20:51.3 |
HIP 66769 |
35.03 |
| 2026-08-15 12:00 |
13:38:07.70 |
+64:20:21.4 |
HIP 66769 |
34.48 |
| 2026-08-16 00:00 |
13:38:09.99 |
+64:19:51.5 |
HIP 66769 |
33.93 |
| 2026-08-16 12:00 |
13:38:12.31 |
+64:19:21.8 |
HIP 66769 |
33.38 |
| 2026-08-17 00:00 |
13:38:14.67 |
+64:18:52.2 |
HIP 66769 |
32.83 |
| 2026-08-17 12:00 |
13:38:17.06 |
+64:18:22.7 |
HIP 66769 |
32.28 |
| 2026-08-18 00:00 |
13:38:19.49 |
+64:17:53.2 |
HIP 66769 |
31.72 |
| 2026-08-18 12:00 |
13:38:21.96 |
+64:17:23.9 |
HIP 66769 |
31.17 |
| 2026-08-19 00:00 |
13:38:24.46 |
+64:16:54.7 |
HIP 66769 |
30.62 |