C/2015 TQ209 (LINEAR)
| Parameter |
Value |
| Designation |
C/2015 TQ209 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-27T14:18:38.540160Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:21Z |
| Obs used |
406 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-12-20.0000000 |
| e |
0.99892368 |
| q (au) |
1.413143 |
| a (au) |
1312.933283 |
| i (deg) |
11.392694 |
| Ω (om, deg) |
224.083104 |
| ω (w, deg) |
281.506087 |
| M (ma, deg) |
359.994788 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
19:51:17.23 |
-10:20:13.9 |
HIP 97766 |
11.03 |
| 2026-02-03 12:00 |
19:51:22.19 |
-10:19:55.8 |
HIP 97766 |
9.85 |
| 2026-02-04 00:00 |
19:51:27.14 |
-10:19:37.5 |
HIP 97766 |
8.69 |
| 2026-02-04 12:00 |
19:51:32.07 |
-10:19:19.2 |
HIP 97766 |
7.58 |
| 2026-02-05 00:00 |
19:51:36.99 |
-10:19:00.8 |
HIP 97766 |
6.51 |
| 2026-02-05 12:00 |
19:51:41.89 |
-10:18:42.4 |
HIP 97766 |
5.53 |
| 2026-02-06 00:00 |
19:51:46.78 |
-10:18:23.8 |
HIP 97766 |
4.67 |
| 2026-02-06 12:00 |
19:51:51.66 |
-10:18:05.2 |
HIP 97766 |
4.02 |
| 2026-02-07 00:00 |
19:51:56.51 |
-10:17:46.5 |
HIP 97766 |
3.69 |
| 2026-02-07 12:00 |
19:52:01.36 |
-10:17:27.8 |
HIP 97766 |
3.76 |
| 2026-02-08 00:00 |
19:52:06.19 |
-10:17:09.0 |
HIP 97766 |
4.21 |
| 2026-02-08 12:00 |
19:52:11.00 |
-10:16:50.1 |
HIP 97766 |
4.93 |
| 2026-02-09 00:00 |
19:52:15.79 |
-10:16:31.1 |
HIP 97766 |
5.82 |
| 2026-02-09 12:00 |
19:52:20.57 |
-10:16:12.1 |
HIP 97766 |
6.81 |
| 2026-02-10 00:00 |
19:52:25.33 |
-10:15:53.0 |
HIP 97766 |
7.86 |
| 2026-02-10 12:00 |
19:52:30.07 |
-10:15:33.8 |
HIP 97766 |
8.95 |
| 2026-02-11 00:00 |
19:52:34.80 |
-10:15:14.6 |
HIP 97766 |
10.06 |
| 2026-02-11 12:00 |
19:52:39.50 |
-10:14:55.3 |
HIP 97766 |
11.20 |
| 2026-02-12 00:00 |
19:52:44.19 |
-10:14:35.9 |
HIP 97766 |
12.34 |
| 2026-02-12 12:00 |
19:52:48.86 |
-10:14:16.5 |
HIP 97888 |
12.65 |
| 2026-02-13 00:00 |
19:52:53.52 |
-10:13:57.1 |
HIP 97888 |
11.55 |
| 2026-02-13 12:00 |
19:52:58.15 |
-10:13:37.5 |
HIP 97888 |
10.48 |
| 2026-02-14 00:00 |
19:53:02.76 |
-10:13:18.0 |
HIP 97888 |
9.43 |
| 2026-02-14 12:00 |
19:53:07.35 |
-10:12:58.3 |
HIP 97888 |
8.43 |
| 2026-02-15 00:00 |
19:53:11.92 |
-10:12:38.6 |
HIP 97888 |
7.47 |
| 2026-02-15 12:00 |
19:53:16.48 |
-10:12:18.9 |
HIP 97888 |
6.59 |
| 2026-02-16 00:00 |
19:53:21.01 |
-10:11:59.1 |
HIP 97888 |
5.81 |
| 2026-02-16 12:00 |
19:53:25.52 |
-10:11:39.3 |
HIP 97888 |
5.18 |
| 2026-02-17 00:00 |
19:53:30.00 |
-10:11:19.4 |
HIP 97888 |
4.75 |
| 2026-02-17 12:00 |
19:53:34.47 |
-10:10:59.5 |
HIP 97888 |
4.58 |
| 2026-02-18 00:00 |
19:53:38.91 |
-10:10:39.5 |
HIP 97888 |
4.68 |
| 2026-02-18 12:00 |
19:53:43.33 |
-10:10:19.5 |
HIP 97888 |
5.04 |
| 2026-02-19 00:00 |
19:53:47.73 |
-10:09:59.4 |
HIP 97888 |
5.61 |
| 2026-02-19 12:00 |
19:53:52.11 |
-10:09:39.3 |
HIP 97888 |
6.33 |
| 2026-02-20 00:00 |
19:53:56.46 |
-10:09:19.2 |
HIP 97888 |
7.15 |
| 2026-02-20 12:00 |
19:54:00.79 |
-10:08:59.0 |
HIP 97888 |
8.04 |
| 2026-02-21 00:00 |
19:54:05.10 |
-10:08:38.8 |
HIP 97888 |
8.97 |
| 2026-02-21 12:00 |
19:54:09.38 |
-10:08:18.6 |
HIP 97888 |
9.93 |
| 2026-02-22 00:00 |
19:54:13.63 |
-10:07:58.3 |
HIP 97888 |
10.92 |
| 2026-02-22 12:00 |
19:54:17.87 |
-10:07:38.0 |
HIP 97888 |
11.92 |
| 2026-02-23 00:00 |
19:54:22.07 |
-10:07:17.7 |
HIP 97888 |
12.92 |
| 2026-02-23 12:00 |
19:54:26.25 |
-10:06:57.3 |
HIP 97888 |
13.94 |
| 2026-02-24 00:00 |
19:54:30.41 |
-10:06:36.9 |
HIP 97888 |
14.96 |