C/1999 T2 (LINEAR)
| Parameter |
Value |
| Designation |
C/1999 T2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-11-24T11:11:44.891520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
1021 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
8.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-10-10.0000000 |
| e |
1.00201162 |
| q (au) |
3.037404 |
| a (au) |
-1509.929133 |
| i (deg) |
111.002049 |
| Ω (om, deg) |
14.878823 |
| ω (w, deg) |
104.667943 |
| M (ma, deg) |
-0.000764 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.101 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.101 |
| n |
6.000 |
| gf |
0.988 |
| gb |
-0.731 |
| 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) |
| 2026-02-03 00:00 |
07:56:58.78 |
-47:07:52.8 |
HIP 38766 |
13.94 |
| 2026-02-03 12:00 |
07:56:54.90 |
-47:07:39.7 |
HIP 38766 |
13.73 |
| 2026-02-04 00:00 |
07:56:51.03 |
-47:07:26.3 |
HIP 38766 |
13.56 |
| 2026-02-04 12:00 |
07:56:47.16 |
-47:07:12.6 |
HIP 38766 |
13.43 |
| 2026-02-05 00:00 |
07:56:43.31 |
-47:06:58.6 |
HIP 38766 |
13.34 |
| 2026-02-05 12:00 |
07:56:39.48 |
-47:06:44.2 |
HIP 38766 |
13.28 |
| 2026-02-06 00:00 |
07:56:35.65 |
-47:06:29.6 |
HIP 38766 |
13.28 |
| 2026-02-06 12:00 |
07:56:31.83 |
-47:06:14.6 |
HIP 38766 |
13.31 |
| 2026-02-07 00:00 |
07:56:28.03 |
-47:05:59.4 |
HIP 38766 |
13.38 |
| 2026-02-07 12:00 |
07:56:24.24 |
-47:05:43.9 |
HIP 38766 |
13.50 |
| 2026-02-08 00:00 |
07:56:20.47 |
-47:05:28.0 |
HIP 38766 |
13.65 |
| 2026-02-08 12:00 |
07:56:16.70 |
-47:05:11.9 |
HIP 38766 |
13.85 |
| 2026-02-09 00:00 |
07:56:12.95 |
-47:04:55.5 |
HIP 38766 |
14.08 |
| 2026-02-09 12:00 |
07:56:09.21 |
-47:04:38.7 |
HIP 38766 |
14.34 |
| 2026-02-10 00:00 |
07:56:05.49 |
-47:04:21.7 |
HIP 38766 |
14.64 |
| 2026-02-10 12:00 |
07:56:01.78 |
-47:04:04.4 |
HIP 38766 |
14.96 |
| 2026-02-11 00:00 |
07:55:58.09 |
-47:03:46.8 |
HIP 38766 |
15.32 |
| 2026-02-11 12:00 |
07:55:54.41 |
-47:03:28.9 |
HIP 38766 |
15.70 |
| 2026-02-12 00:00 |
07:55:50.75 |
-47:03:10.8 |
HIP 38766 |
16.11 |
| 2026-02-12 12:00 |
07:55:47.10 |
-47:02:52.3 |
HIP 38700 |
16.39 |
| 2026-02-13 00:00 |
07:55:43.47 |
-47:02:33.6 |
HIP 38700 |
16.56 |
| 2026-02-13 12:00 |
07:55:39.85 |
-47:02:14.6 |
HIP 38700 |
16.76 |
| 2026-02-14 00:00 |
07:55:36.25 |
-47:01:55.3 |
HIP 38700 |
16.99 |
| 2026-02-14 12:00 |
07:55:32.67 |
-47:01:35.7 |
HIP 38700 |
17.25 |
| 2026-02-15 00:00 |
07:55:29.10 |
-47:01:15.8 |
HIP 38700 |
17.54 |
| 2026-02-15 12:00 |
07:55:25.55 |
-47:00:55.7 |
HIP 38700 |
17.86 |
| 2026-02-16 00:00 |
07:55:22.02 |
-47:00:35.3 |
HIP 38700 |
18.20 |
| 2026-02-16 12:00 |
07:55:18.50 |
-47:00:14.6 |
HIP 38700 |
18.57 |
| 2026-02-17 00:00 |
07:55:15.01 |
-46:59:53.7 |
HIP 38700 |
18.95 |
| 2026-02-17 12:00 |
07:55:11.53 |
-46:59:32.4 |
HIP 38700 |
19.36 |
| 2026-02-18 00:00 |
07:55:08.07 |
-46:59:11.0 |
HIP 38704 |
19.47 |
| 2026-02-18 12:00 |
07:55:04.63 |
-46:58:49.2 |
HIP 38704 |
19.21 |
| 2026-02-19 00:00 |
07:55:01.21 |
-46:58:27.2 |
HIP 38704 |
18.97 |
| 2026-02-19 12:00 |
07:54:57.81 |
-46:58:05.0 |
HIP 38704 |
18.75 |
| 2026-02-20 00:00 |
07:54:54.43 |
-46:57:42.4 |
HIP 38704 |
18.55 |
| 2026-02-20 12:00 |
07:54:51.07 |
-46:57:19.7 |
HIP 38704 |
18.36 |
| 2026-02-21 00:00 |
07:54:47.73 |
-46:56:56.6 |
HIP 38704 |
18.20 |
| 2026-02-21 12:00 |
07:54:44.41 |
-46:56:33.3 |
HIP 38704 |
18.05 |
| 2026-02-22 00:00 |
07:54:41.11 |
-46:56:09.8 |
HIP 38704 |
17.92 |
| 2026-02-22 12:00 |
07:54:37.83 |
-46:55:46.0 |
HIP 38704 |
17.82 |
| 2026-02-23 00:00 |
07:54:34.57 |
-46:55:22.0 |
HIP 38704 |
17.73 |
| 2026-02-23 12:00 |
07:54:31.33 |
-46:54:57.8 |
HIP 38704 |
17.67 |
| 2026-02-24 00:00 |
07:54:28.12 |
-46:54:33.3 |
HIP 38704 |
17.62 |