C/1997 O1 (Tilbrook)
| 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 |
-0.998 |
| 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) |
| 2026-02-03 00:00 |
03:57:57.83 |
+57:22:31.1 |
HIP 18602 |
8.34 |
| 2026-02-03 12:00 |
03:57:56.37 |
+57:22:06.3 |
HIP 18602 |
8.74 |
| 2026-02-04 00:00 |
03:57:54.96 |
+57:21:41.5 |
HIP 18602 |
9.13 |
| 2026-02-04 12:00 |
03:57:53.58 |
+57:21:16.7 |
HIP 18602 |
9.53 |
| 2026-02-05 00:00 |
03:57:52.24 |
+57:20:51.9 |
HIP 18602 |
9.93 |
| 2026-02-05 12:00 |
03:57:50.95 |
+57:20:27.1 |
HIP 18602 |
10.32 |
| 2026-02-06 00:00 |
03:57:49.69 |
+57:20:02.3 |
HIP 18602 |
10.72 |
| 2026-02-06 12:00 |
03:57:48.47 |
+57:19:37.5 |
HIP 18602 |
11.12 |
| 2026-02-07 00:00 |
03:57:47.29 |
+57:19:12.7 |
HIP 18602 |
11.51 |
| 2026-02-07 12:00 |
03:57:46.15 |
+57:18:48.0 |
HIP 18602 |
11.91 |
| 2026-02-08 00:00 |
03:57:45.05 |
+57:18:23.2 |
HIP 18602 |
12.31 |
| 2026-02-08 12:00 |
03:57:43.99 |
+57:17:58.5 |
HIP 18602 |
12.70 |
| 2026-02-09 00:00 |
03:57:42.96 |
+57:17:33.8 |
HIP 18602 |
13.09 |
| 2026-02-09 12:00 |
03:57:41.98 |
+57:17:09.1 |
HIP 18602 |
13.48 |
| 2026-02-10 00:00 |
03:57:41.04 |
+57:16:44.4 |
HIP 18602 |
13.87 |
| 2026-02-10 12:00 |
03:57:40.14 |
+57:16:19.8 |
HIP 18602 |
14.26 |
| 2026-02-11 00:00 |
03:57:39.28 |
+57:15:55.1 |
HIP 18602 |
14.65 |
| 2026-02-11 12:00 |
03:57:38.45 |
+57:15:30.5 |
HIP 18602 |
15.03 |
| 2026-02-12 00:00 |
03:57:37.67 |
+57:15:06.0 |
HIP 18602 |
15.42 |
| 2026-02-12 12:00 |
03:57:36.93 |
+57:14:41.4 |
HIP 18602 |
15.80 |
| 2026-02-13 00:00 |
03:57:36.23 |
+57:14:16.9 |
HIP 18602 |
16.18 |
| 2026-02-13 12:00 |
03:57:35.56 |
+57:13:52.5 |
HIP 18602 |
16.56 |
| 2026-02-14 00:00 |
03:57:34.94 |
+57:13:28.0 |
HIP 18602 |
16.94 |
| 2026-02-14 12:00 |
03:57:34.36 |
+57:13:03.6 |
HIP 18602 |
17.31 |
| 2026-02-15 00:00 |
03:57:33.82 |
+57:12:39.3 |
HIP 18602 |
17.68 |
| 2026-02-15 12:00 |
03:57:33.31 |
+57:12:15.0 |
HIP 18602 |
18.05 |
| 2026-02-16 00:00 |
03:57:32.85 |
+57:11:50.7 |
HIP 18602 |
18.42 |
| 2026-02-16 12:00 |
03:57:32.43 |
+57:11:26.5 |
HIP 18602 |
18.79 |
| 2026-02-17 00:00 |
03:57:32.04 |
+57:11:02.3 |
HIP 18602 |
19.15 |
| 2026-02-17 12:00 |
03:57:31.70 |
+57:10:38.2 |
HIP 18602 |
19.52 |
| 2026-02-18 00:00 |
03:57:31.40 |
+57:10:14.1 |
HIP 18602 |
19.88 |
| 2026-02-18 12:00 |
03:57:31.13 |
+57:09:50.1 |
HIP 18602 |
20.24 |
| 2026-02-19 00:00 |
03:57:30.91 |
+57:09:26.1 |
HIP 18383 |
20.16 |
| 2026-02-19 12:00 |
03:57:30.73 |
+57:09:02.2 |
HIP 18383 |
19.86 |
| 2026-02-20 00:00 |
03:57:30.58 |
+57:08:38.3 |
HIP 18383 |
19.57 |
| 2026-02-20 12:00 |
03:57:30.48 |
+57:08:14.6 |
HIP 18383 |
19.29 |
| 2026-02-21 00:00 |
03:57:30.42 |
+57:07:50.8 |
HIP 18383 |
19.02 |
| 2026-02-21 12:00 |
03:57:30.39 |
+57:07:27.2 |
HIP 18383 |
18.76 |
| 2026-02-22 00:00 |
03:57:30.41 |
+57:07:03.6 |
HIP 18383 |
18.51 |
| 2026-02-22 12:00 |
03:57:30.46 |
+57:06:40.0 |
HIP 18383 |
18.26 |
| 2026-02-23 00:00 |
03:57:30.55 |
+57:06:16.6 |
HIP 18383 |
18.03 |
| 2026-02-23 12:00 |
03:57:30.68 |
+57:05:53.2 |
HIP 18383 |
17.81 |
| 2026-02-24 00:00 |
03:57:30.86 |
+57:05:29.9 |
HIP 18383 |
17.60 |