| Parameter |
Value |
| Designation |
84P/Giclas |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-06-04T08:54:26.020800Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:18:26Z |
| Obs used |
1117 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-12-01.0000000 |
| e |
0.50980188 |
| q (au) |
1.763377 |
| a (au) |
3.597273 |
| i (deg) |
7.336273 |
| Ω (om, deg) |
110.154070 |
| ω (w, deg) |
278.215365 |
| M (ma, deg) |
227.622159 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.260 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.260 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
20:47:05.41 |
-22:18:08.0 |
HIP 102512 |
11.64 |
| 2026-07-29 12:00 |
20:46:39.80 |
-22:21:46.0 |
HIP 102512 |
12.14 |
| 2026-07-30 00:00 |
20:46:14.03 |
-22:25:24.1 |
HIP 102512 |
16.01 |
| 2026-07-30 12:00 |
20:45:48.10 |
-22:29:02.2 |
HIP 102512 |
21.52 |
| 2026-07-31 00:00 |
20:45:22.03 |
-22:32:40.2 |
HIP 102280 |
27.24 |
| 2026-07-31 12:00 |
20:44:55.82 |
-22:36:18.0 |
HIP 102280 |
22.54 |
| 2026-08-01 00:00 |
20:44:29.47 |
-22:39:55.6 |
HIP 102280 |
19.31 |
| 2026-08-01 12:00 |
20:44:03.01 |
-22:43:33.0 |
HIP 102280 |
18.37 |
| 2026-08-02 00:00 |
20:43:36.42 |
-22:47:10.2 |
HIP 102280 |
20.07 |
| 2026-08-02 12:00 |
20:43:09.74 |
-22:50:46.9 |
HIP 102175 |
16.31 |
| 2026-08-03 00:00 |
20:42:42.95 |
-22:54:23.3 |
HIP 102175 |
9.20 |
| 2026-08-03 12:00 |
20:42:16.08 |
-22:57:59.2 |
HIP 102175 |
2.33 |
| 2026-08-04 00:00 |
20:41:49.12 |
-23:01:34.6 |
HIP 102175 |
5.37 |
| 2026-08-04 12:00 |
20:41:22.09 |
-23:05:09.4 |
HIP 102146 |
7.63 |
| 2026-08-05 00:00 |
20:40:55.00 |
-23:08:43.6 |
HIP 102146 |
13.24 |
| 2026-08-05 12:00 |
20:40:27.86 |
-23:12:17.2 |
HIP 102146 |
19.89 |
| 2026-08-06 00:00 |
20:40:00.67 |
-23:15:50.0 |
HIP 102146 |
26.82 |
| 2026-08-06 12:00 |
20:39:33.45 |
-23:19:22.1 |
HIP 101997 |
28.49 |
| 2026-08-07 00:00 |
20:39:06.20 |
-23:22:53.3 |
HIP 101997 |
27.94 |
| 2026-08-07 12:00 |
20:38:38.93 |
-23:26:23.6 |
HIP 101997 |
29.21 |
| 2026-08-08 00:00 |
20:38:11.66 |
-23:29:53.0 |
HIP 101997 |
32.07 |
| 2026-08-08 12:00 |
20:37:44.40 |
-23:33:21.5 |
HIP 101601 |
31.16 |
| 2026-08-09 00:00 |
20:37:17.15 |
-23:36:48.8 |
HIP 101601 |
25.32 |
| 2026-08-09 12:00 |
20:36:49.92 |
-23:40:15.1 |
HIP 101601 |
20.33 |
| 2026-08-10 00:00 |
20:36:22.73 |
-23:43:40.2 |
HIP 101601 |
16.93 |
| 2026-08-10 12:00 |
20:35:55.59 |
-23:47:04.1 |
HIP 101601 |
16.15 |
| 2026-08-11 00:00 |
20:35:28.50 |
-23:50:26.8 |
HIP 101601 |
18.29 |
| 2026-08-11 12:00 |
20:35:01.47 |
-23:53:48.2 |
HIP 101601 |
22.52 |
| 2026-08-12 00:00 |
20:34:34.53 |
-23:57:08.2 |
HIP 101601 |
27.87 |
| 2026-08-12 12:00 |
20:34:07.67 |
-24:00:26.8 |
HIP 101328 |
26.05 |
| 2026-08-13 00:00 |
20:33:40.91 |
-24:03:44.0 |
HIP 101328 |
19.68 |
| 2026-08-13 12:00 |
20:33:14.26 |
-24:06:59.6 |
HIP 101328 |
13.91 |
| 2026-08-14 00:00 |
20:32:47.73 |
-24:10:13.8 |
HIP 101328 |
9.74 |
| 2026-08-14 12:00 |
20:32:21.33 |
-24:13:26.3 |
HIP 101328 |
9.50 |
| 2026-08-15 00:00 |
20:31:55.07 |
-24:16:37.2 |
HIP 101328 |
13.33 |
| 2026-08-15 12:00 |
20:31:28.96 |
-24:19:46.4 |
HIP 101328 |
18.86 |
| 2026-08-16 00:00 |
20:31:03.01 |
-24:22:53.9 |
HIP 101328 |
24.94 |
| 2026-08-16 12:00 |
20:30:37.23 |
-24:25:59.7 |
HIP 101328 |
31.22 |
| 2026-08-17 00:00 |
20:30:11.64 |
-24:29:03.6 |
HIP 100985 |
30.26 |
| 2026-08-17 12:00 |
20:29:46.23 |
-24:32:05.8 |
HIP 100985 |
28.38 |
| 2026-08-18 00:00 |
20:29:21.03 |
-24:35:06.0 |
HIP 100985 |
27.93 |
| 2026-08-18 12:00 |
20:28:56.03 |
-24:38:04.4 |
HIP 100864 |
25.02 |
| 2026-08-19 00:00 |
20:28:31.26 |
-24:41:00.8 |
HIP 100864 |
19.69 |