| 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 |
0.999 |
| 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) |
| 2026-09-20 00:00 |
08:03:26.15 |
-45:34:56.9 |
HIP 39571 |
20.86 |
| 2026-09-20 12:00 |
08:03:27.76 |
-45:35:28.6 |
HIP 39571 |
20.88 |
| 2026-09-21 00:00 |
08:03:29.34 |
-45:36:00.4 |
HIP 39571 |
20.92 |
| 2026-09-21 12:00 |
08:03:30.90 |
-45:36:32.3 |
HIP 39571 |
20.98 |
| 2026-09-22 00:00 |
08:03:32.43 |
-45:37:04.3 |
HIP 39571 |
21.06 |
| 2026-09-22 12:00 |
08:03:33.94 |
-45:37:36.5 |
HIP 39571 |
21.16 |
| 2026-09-23 00:00 |
08:03:35.42 |
-45:38:08.8 |
HIP 39571 |
21.29 |
| 2026-09-23 12:00 |
08:03:36.87 |
-45:38:41.2 |
HIP 39571 |
21.43 |
| 2026-09-24 00:00 |
08:03:38.30 |
-45:39:13.7 |
HIP 39571 |
21.60 |
| 2026-09-24 12:00 |
08:03:39.70 |
-45:39:46.4 |
HIP 39571 |
21.78 |
| 2026-09-25 00:00 |
08:03:41.08 |
-45:40:19.1 |
HIP 39571 |
21.99 |
| 2026-09-25 12:00 |
08:03:42.43 |
-45:40:52.0 |
HIP 39571 |
22.21 |
| 2026-09-26 00:00 |
08:03:43.75 |
-45:41:24.9 |
HIP 39571 |
22.45 |
| 2026-09-26 12:00 |
08:03:45.05 |
-45:41:58.0 |
HIP 39571 |
22.71 |
| 2026-09-27 00:00 |
08:03:46.32 |
-45:42:31.2 |
HIP 39571 |
22.99 |
| 2026-09-27 12:00 |
08:03:47.56 |
-45:43:04.5 |
HIP 39571 |
23.28 |
| 2026-09-28 00:00 |
08:03:48.78 |
-45:43:37.9 |
HIP 39571 |
23.59 |
| 2026-09-28 12:00 |
08:03:49.97 |
-45:44:11.4 |
HIP 39571 |
23.91 |
| 2026-09-29 00:00 |
08:03:51.13 |
-45:44:45.0 |
HIP 39571 |
24.25 |
| 2026-09-29 12:00 |
08:03:52.26 |
-45:45:18.6 |
HIP 39571 |
24.60 |
| 2026-09-30 00:00 |
08:03:53.37 |
-45:45:52.4 |
HIP 39623 |
24.38 |
| 2026-09-30 12:00 |
08:03:54.45 |
-45:46:26.3 |
HIP 39623 |
23.90 |
| 2026-10-01 00:00 |
08:03:55.50 |
-45:47:00.2 |
HIP 39623 |
23.44 |
| 2026-10-01 12:00 |
08:03:56.52 |
-45:47:34.2 |
HIP 39623 |
22.98 |
| 2026-10-02 00:00 |
08:03:57.52 |
-45:48:08.3 |
HIP 39623 |
22.53 |
| 2026-10-02 12:00 |
08:03:58.48 |
-45:48:42.5 |
HIP 39623 |
22.10 |
| 2026-10-03 00:00 |
08:03:59.42 |
-45:49:16.8 |
HIP 39623 |
21.67 |
| 2026-10-03 12:00 |
08:04:00.33 |
-45:49:51.2 |
HIP 39623 |
21.26 |
| 2026-10-04 00:00 |
08:04:01.21 |
-45:50:25.6 |
HIP 39623 |
20.86 |
| 2026-10-04 12:00 |
08:04:02.07 |
-45:51:00.1 |
HIP 39623 |
20.47 |
| 2026-10-05 00:00 |
08:04:02.89 |
-45:51:34.7 |
HIP 39623 |
20.10 |
| 2026-10-05 12:00 |
08:04:03.69 |
-45:52:09.3 |
HIP 39623 |
19.74 |
| 2026-10-06 00:00 |
08:04:04.45 |
-45:52:44.0 |
HIP 39623 |
19.40 |
| 2026-10-06 12:00 |
08:04:05.19 |
-45:53:18.8 |
HIP 39623 |
19.08 |
| 2026-10-07 00:00 |
08:04:05.90 |
-45:53:53.6 |
HIP 39623 |
18.77 |
| 2026-10-07 12:00 |
08:04:06.58 |
-45:54:28.5 |
HIP 39623 |
18.48 |
| 2026-10-08 00:00 |
08:04:07.23 |
-45:55:03.4 |
HIP 39623 |
18.22 |
| 2026-10-08 12:00 |
08:04:07.84 |
-45:55:38.4 |
HIP 39623 |
17.97 |
| 2026-10-09 00:00 |
08:04:08.43 |
-45:56:13.4 |
HIP 39623 |
17.74 |
| 2026-10-09 12:00 |
08:04:08.99 |
-45:56:48.5 |
HIP 39623 |
17.54 |
| 2026-10-10 00:00 |
08:04:09.52 |
-45:57:23.6 |
HIP 39623 |
17.35 |
| 2026-10-10 12:00 |
08:04:10.02 |
-45:57:58.8 |
HIP 39623 |
17.20 |
| 2026-10-11 00:00 |
08:04:10.49 |
-45:58:34.0 |
HIP 39623 |
17.06 |