| 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) |
| 2026-05-12 00:00 |
07:51:51.08 |
-45:30:23.4 |
HIP 38346 |
13.68 |
| 2026-05-12 12:00 |
07:51:52.38 |
-45:29:52.8 |
HIP 38346 |
14.24 |
| 2026-05-13 00:00 |
07:51:53.71 |
-45:29:22.5 |
HIP 38346 |
14.79 |
| 2026-05-13 12:00 |
07:51:55.06 |
-45:28:52.3 |
HIP 38346 |
15.35 |
| 2026-05-14 00:00 |
07:51:56.44 |
-45:28:22.3 |
HIP 38346 |
15.91 |
| 2026-05-14 12:00 |
07:51:57.85 |
-45:27:52.4 |
HIP 38346 |
16.46 |
| 2026-05-15 00:00 |
07:51:59.28 |
-45:27:22.7 |
HIP 38346 |
17.02 |
| 2026-05-15 12:00 |
07:52:00.74 |
-45:26:53.2 |
HIP 38346 |
17.57 |
| 2026-05-16 00:00 |
07:52:02.23 |
-45:26:23.8 |
HIP 38510 |
18.06 |
| 2026-05-16 12:00 |
07:52:03.74 |
-45:25:54.6 |
HIP 38510 |
17.52 |
| 2026-05-17 00:00 |
07:52:05.28 |
-45:25:25.6 |
HIP 38510 |
16.98 |
| 2026-05-17 12:00 |
07:52:06.84 |
-45:24:56.7 |
HIP 38510 |
16.45 |
| 2026-05-18 00:00 |
07:52:08.43 |
-45:24:28.1 |
HIP 38510 |
15.91 |
| 2026-05-18 12:00 |
07:52:10.05 |
-45:23:59.6 |
HIP 38510 |
15.37 |
| 2026-05-19 00:00 |
07:52:11.69 |
-45:23:31.3 |
HIP 38510 |
14.84 |
| 2026-05-19 12:00 |
07:52:13.35 |
-45:23:03.1 |
HIP 38510 |
14.30 |
| 2026-05-20 00:00 |
07:52:15.04 |
-45:22:35.2 |
HIP 38510 |
13.76 |
| 2026-05-20 12:00 |
07:52:16.76 |
-45:22:07.5 |
HIP 38510 |
13.23 |
| 2026-05-21 00:00 |
07:52:18.49 |
-45:21:39.9 |
HIP 38510 |
12.69 |
| 2026-05-21 12:00 |
07:52:20.26 |
-45:21:12.5 |
HIP 38510 |
12.16 |
| 2026-05-22 00:00 |
07:52:22.04 |
-45:20:45.3 |
HIP 38510 |
11.62 |
| 2026-05-22 12:00 |
07:52:23.86 |
-45:20:18.4 |
HIP 38510 |
11.09 |
| 2026-05-23 00:00 |
07:52:25.69 |
-45:19:51.6 |
HIP 38510 |
10.55 |
| 2026-05-23 12:00 |
07:52:27.55 |
-45:19:25.0 |
HIP 38510 |
10.02 |
| 2026-05-24 00:00 |
07:52:29.43 |
-45:18:58.6 |
HIP 38510 |
9.49 |
| 2026-05-24 12:00 |
07:52:31.34 |
-45:18:32.4 |
HIP 38510 |
8.96 |
| 2026-05-25 00:00 |
07:52:33.26 |
-45:18:06.4 |
HIP 38510 |
8.43 |
| 2026-05-25 12:00 |
07:52:35.21 |
-45:17:40.6 |
HIP 38510 |
7.90 |
| 2026-05-26 00:00 |
07:52:37.19 |
-45:17:15.1 |
HIP 38510 |
7.37 |
| 2026-05-26 12:00 |
07:52:39.18 |
-45:16:49.7 |
HIP 38510 |
6.84 |
| 2026-05-27 00:00 |
07:52:41.20 |
-45:16:24.5 |
HIP 38510 |
6.32 |
| 2026-05-27 12:00 |
07:52:43.24 |
-45:15:59.6 |
HIP 38510 |
5.80 |
| 2026-05-28 00:00 |
07:52:45.31 |
-45:15:34.8 |
HIP 38510 |
5.28 |
| 2026-05-28 12:00 |
07:52:47.39 |
-45:15:10.3 |
HIP 38510 |
4.77 |
| 2026-05-29 00:00 |
07:52:49.50 |
-45:14:46.0 |
HIP 38510 |
4.27 |
| 2026-05-29 12:00 |
07:52:51.63 |
-45:14:21.9 |
HIP 38510 |
3.78 |
| 2026-05-30 00:00 |
07:52:53.78 |
-45:13:58.0 |
HIP 38510 |
3.30 |
| 2026-05-30 12:00 |
07:52:55.95 |
-45:13:34.3 |
HIP 38510 |
2.84 |
| 2026-05-31 00:00 |
07:52:58.14 |
-45:13:10.9 |
HIP 38510 |
2.42 |
| 2026-05-31 12:00 |
07:53:00.35 |
-45:12:47.7 |
HIP 38510 |
2.06 |
| 2026-06-01 00:00 |
07:53:02.58 |
-45:12:24.7 |
HIP 38510 |
1.79 |
| 2026-06-01 12:00 |
07:53:04.83 |
-45:12:01.9 |
HIP 38510 |
1.66 |
| 2026-06-02 00:00 |
07:53:07.11 |
-45:11:39.3 |
HIP 38510 |
1.69 |