| Parameter |
Value |
| Designation |
C/1997 O1 (Tilbrook) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-07-13T10:06:45.694080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:51Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-09-25.0000000 |
| e |
0.98423544 |
| q (au) |
1.371814 |
| a (au) |
87.018855 |
| i (deg) |
115.802396 |
| Ω (om, deg) |
231.245985 |
| ω (w, deg) |
336.189199 |
| M (ma, deg) |
0.089338 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.718 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.718 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:06:55.39 |
+56:33:57.0 |
HIP 19224 |
10.59 |
| 2026-06-01 12:00 |
04:06:59.57 |
+56:34:03.6 |
HIP 19224 |
10.37 |
| 2026-06-02 00:00 |
04:07:03.74 |
+56:34:10.3 |
HIP 19224 |
10.18 |
| 2026-06-02 12:00 |
04:07:07.90 |
+56:34:17.2 |
HIP 19224 |
10.02 |
| 2026-06-03 00:00 |
04:07:12.06 |
+56:34:24.3 |
HIP 19224 |
9.88 |
| 2026-06-03 12:00 |
04:07:16.22 |
+56:34:31.5 |
HIP 19224 |
9.78 |
| 2026-06-04 00:00 |
04:07:20.37 |
+56:34:38.8 |
HIP 19224 |
9.71 |
| 2026-06-04 12:00 |
04:07:24.51 |
+56:34:46.4 |
HIP 19224 |
9.67 |
| 2026-06-05 00:00 |
04:07:28.65 |
+56:34:54.1 |
HIP 19224 |
9.66 |
| 2026-06-05 12:00 |
04:07:32.79 |
+56:35:01.9 |
HIP 19224 |
9.69 |
| 2026-06-06 00:00 |
04:07:36.91 |
+56:35:09.9 |
HIP 19224 |
9.74 |
| 2026-06-06 12:00 |
04:07:41.04 |
+56:35:18.0 |
HIP 19224 |
9.83 |
| 2026-06-07 00:00 |
04:07:45.15 |
+56:35:26.3 |
HIP 19224 |
9.95 |
| 2026-06-07 12:00 |
04:07:49.26 |
+56:35:34.8 |
HIP 19224 |
10.10 |
| 2026-06-08 00:00 |
04:07:53.36 |
+56:35:43.4 |
HIP 19224 |
10.27 |
| 2026-06-08 12:00 |
04:07:57.45 |
+56:35:52.2 |
HIP 19224 |
10.48 |
| 2026-06-09 00:00 |
04:08:01.54 |
+56:36:01.1 |
HIP 19224 |
10.71 |
| 2026-06-09 12:00 |
04:08:05.61 |
+56:36:10.2 |
HIP 19224 |
10.96 |
| 2026-06-10 00:00 |
04:08:09.68 |
+56:36:19.4 |
HIP 19224 |
11.23 |
| 2026-06-10 12:00 |
04:08:13.74 |
+56:36:28.8 |
HIP 19224 |
11.52 |
| 2026-06-11 00:00 |
04:08:17.79 |
+56:36:38.3 |
HIP 19224 |
11.84 |
| 2026-06-11 12:00 |
04:08:21.84 |
+56:36:48.0 |
HIP 19224 |
12.16 |
| 2026-06-12 00:00 |
04:08:25.87 |
+56:36:57.8 |
HIP 19224 |
12.51 |
| 2026-06-12 12:00 |
04:08:29.89 |
+56:37:07.8 |
HIP 19224 |
12.87 |
| 2026-06-13 00:00 |
04:08:33.91 |
+56:37:17.9 |
HIP 19224 |
13.24 |
| 2026-06-13 12:00 |
04:08:37.91 |
+56:37:28.2 |
HIP 19415 |
13.56 |
| 2026-06-14 00:00 |
04:08:41.90 |
+56:37:38.6 |
HIP 19415 |
13.43 |
| 2026-06-14 12:00 |
04:08:45.88 |
+56:37:49.2 |
HIP 19415 |
13.33 |
| 2026-06-15 00:00 |
04:08:49.85 |
+56:37:59.9 |
HIP 19415 |
13.26 |
| 2026-06-15 12:00 |
04:08:53.81 |
+56:38:10.7 |
HIP 19415 |
13.22 |
| 2026-06-16 00:00 |
04:08:57.76 |
+56:38:21.7 |
HIP 19415 |
13.20 |
| 2026-06-16 12:00 |
04:09:01.70 |
+56:38:32.8 |
HIP 19415 |
13.21 |
| 2026-06-17 00:00 |
04:09:05.62 |
+56:38:44.1 |
HIP 19415 |
13.25 |
| 2026-06-17 12:00 |
04:09:09.53 |
+56:38:55.5 |
HIP 19415 |
13.32 |
| 2026-06-18 00:00 |
04:09:13.43 |
+56:39:07.1 |
HIP 19415 |
13.42 |
| 2026-06-18 12:00 |
04:09:17.32 |
+56:39:18.8 |
HIP 19415 |
13.53 |
| 2026-06-19 00:00 |
04:09:21.19 |
+56:39:30.6 |
HIP 19415 |
13.68 |
| 2026-06-19 12:00 |
04:09:25.05 |
+56:39:42.6 |
HIP 19415 |
13.85 |
| 2026-06-20 00:00 |
04:09:28.89 |
+56:39:54.7 |
HIP 19415 |
14.04 |
| 2026-06-20 12:00 |
04:09:32.72 |
+56:40:06.9 |
HIP 19415 |
14.25 |
| 2026-06-21 00:00 |
04:09:36.54 |
+56:40:19.3 |
HIP 19415 |
14.49 |
| 2026-06-21 12:00 |
04:09:40.34 |
+56:40:31.8 |
HIP 19415 |
14.75 |
| 2026-06-22 00:00 |
04:09:44.12 |
+56:40:44.5 |
HIP 19415 |
15.02 |