| Parameter |
Value |
| Designation |
C/2000 Y1 (Tubbiolo) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-02-02T03:45:55.477440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-05-01.0000000 |
| e |
1.00234998 |
| q (au) |
7.974764 |
| a (au) |
-3393.538738 |
| i (deg) |
137.974246 |
| Ω (om, deg) |
239.394833 |
| ω (w, deg) |
181.732505 |
| M (ma, deg) |
0.000438 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.458 + 2.166\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.458 |
| n |
2.166 |
| gf |
0.980 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.924 |
| 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) |
| 2026-09-20 00:00 |
18:53:36.28 |
-53:53:35.7 |
HIP 92795 |
21.74 |
| 2026-09-20 12:00 |
18:53:34.71 |
-53:53:13.9 |
HIP 92795 |
21.49 |
| 2026-09-21 00:00 |
18:53:33.19 |
-53:52:52.1 |
HIP 92795 |
21.24 |
| 2026-09-21 12:00 |
18:53:31.70 |
-53:52:30.1 |
HIP 92795 |
21.00 |
| 2026-09-22 00:00 |
18:53:30.26 |
-53:52:08.1 |
HIP 92795 |
20.76 |
| 2026-09-22 12:00 |
18:53:28.85 |
-53:51:46.1 |
HIP 92795 |
20.52 |
| 2026-09-23 00:00 |
18:53:27.49 |
-53:51:24.0 |
HIP 92795 |
20.28 |
| 2026-09-23 12:00 |
18:53:26.16 |
-53:51:01.8 |
HIP 92795 |
20.05 |
| 2026-09-24 00:00 |
18:53:24.88 |
-53:50:39.6 |
HIP 92795 |
19.81 |
| 2026-09-24 12:00 |
18:53:23.64 |
-53:50:17.3 |
HIP 92795 |
19.58 |
| 2026-09-25 00:00 |
18:53:22.43 |
-53:49:55.0 |
HIP 92795 |
19.36 |
| 2026-09-25 12:00 |
18:53:21.27 |
-53:49:32.6 |
HIP 92795 |
19.13 |
| 2026-09-26 00:00 |
18:53:20.15 |
-53:49:10.2 |
HIP 92795 |
18.91 |
| 2026-09-26 12:00 |
18:53:19.07 |
-53:48:47.7 |
HIP 92795 |
18.69 |
| 2026-09-27 00:00 |
18:53:18.03 |
-53:48:25.1 |
HIP 92795 |
18.47 |
| 2026-09-27 12:00 |
18:53:17.02 |
-53:48:02.5 |
HIP 92795 |
18.25 |
| 2026-09-28 00:00 |
18:53:16.06 |
-53:47:39.9 |
HIP 92795 |
18.04 |
| 2026-09-28 12:00 |
18:53:15.14 |
-53:47:17.3 |
HIP 92795 |
17.82 |
| 2026-09-29 00:00 |
18:53:14.26 |
-53:46:54.5 |
HIP 92795 |
17.62 |
| 2026-09-29 12:00 |
18:53:13.42 |
-53:46:31.8 |
HIP 92795 |
17.41 |
| 2026-09-30 00:00 |
18:53:12.62 |
-53:46:09.0 |
HIP 92795 |
17.20 |
| 2026-09-30 12:00 |
18:53:11.87 |
-53:45:46.2 |
HIP 92795 |
17.00 |
| 2026-10-01 00:00 |
18:53:11.15 |
-53:45:23.3 |
HIP 92795 |
16.80 |
| 2026-10-01 12:00 |
18:53:10.47 |
-53:45:00.4 |
HIP 92795 |
16.60 |
| 2026-10-02 00:00 |
18:53:09.83 |
-53:44:37.5 |
HIP 92795 |
16.41 |
| 2026-10-02 12:00 |
18:53:09.24 |
-53:44:14.5 |
HIP 92795 |
16.21 |
| 2026-10-03 00:00 |
18:53:08.68 |
-53:43:51.5 |
HIP 92795 |
16.02 |
| 2026-10-03 12:00 |
18:53:08.17 |
-53:43:28.5 |
HIP 92795 |
15.83 |
| 2026-10-04 00:00 |
18:53:07.69 |
-53:43:05.4 |
HIP 92795 |
15.65 |
| 2026-10-04 12:00 |
18:53:07.26 |
-53:42:42.4 |
HIP 92795 |
15.46 |
| 2026-10-05 00:00 |
18:53:06.87 |
-53:42:19.3 |
HIP 92795 |
15.28 |
| 2026-10-05 12:00 |
18:53:06.52 |
-53:41:56.1 |
HIP 92795 |
15.10 |
| 2026-10-06 00:00 |
18:53:06.20 |
-53:41:33.0 |
HIP 92795 |
14.93 |
| 2026-10-06 12:00 |
18:53:05.93 |
-53:41:09.8 |
HIP 92795 |
14.76 |
| 2026-10-07 00:00 |
18:53:05.70 |
-53:40:46.7 |
HIP 92795 |
14.59 |
| 2026-10-07 12:00 |
18:53:05.51 |
-53:40:23.5 |
HIP 92795 |
14.42 |
| 2026-10-08 00:00 |
18:53:05.36 |
-53:40:00.3 |
HIP 92795 |
14.26 |
| 2026-10-08 12:00 |
18:53:05.26 |
-53:39:37.1 |
HIP 92795 |
14.10 |
| 2026-10-09 00:00 |
18:53:05.19 |
-53:39:13.8 |
HIP 92795 |
13.94 |
| 2026-10-09 12:00 |
18:53:05.16 |
-53:38:50.6 |
HIP 92795 |
13.79 |
| 2026-10-10 00:00 |
18:53:05.17 |
-53:38:27.3 |
HIP 92795 |
13.64 |
| 2026-10-10 12:00 |
18:53:05.23 |
-53:38:04.1 |
HIP 92795 |
13.49 |
| 2026-10-11 00:00 |
18:53:05.32 |
-53:37:40.8 |
HIP 92795 |
13.35 |