| Parameter |
Value |
| Designation |
C/2013 C2 (Tenagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-09-02T03:56:21.143040Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:52Z |
| Obs used |
550 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-07-16.0000000 |
| e |
0.43171756 |
| q (au) |
9.131701 |
| a (au) |
16.068948 |
| i (deg) |
21.336708 |
| Ω (om, deg) |
247.531370 |
| ω (w, deg) |
308.907427 |
| M (ma, deg) |
4.863241 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.695 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.695 |
| n |
2.000 |
| gf |
0.993 |
| gb |
-0.506 |
| k |
0.800 |
| δ90 |
9.678 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:27:16.50 |
+00:01:40.1 |
HIP 100940 |
15.10 |
| 2026-05-12 12:00 |
20:27:16.06 |
+00:02:20.9 |
HIP 100940 |
15.67 |
| 2026-05-13 00:00 |
20:27:15.55 |
+00:03:01.4 |
HIP 100940 |
16.25 |
| 2026-05-13 12:00 |
20:27:14.98 |
+00:03:41.7 |
HIP 100940 |
16.85 |
| 2026-05-14 00:00 |
20:27:14.35 |
+00:04:21.7 |
HIP 100940 |
17.46 |
| 2026-05-14 12:00 |
20:27:13.66 |
+00:05:01.4 |
HIP 100940 |
18.09 |
| 2026-05-15 00:00 |
20:27:12.90 |
+00:05:40.8 |
HIP 100940 |
18.72 |
| 2026-05-15 12:00 |
20:27:12.08 |
+00:06:20.0 |
HIP 100940 |
19.36 |
| 2026-05-16 00:00 |
20:27:11.21 |
+00:06:58.9 |
HIP 100940 |
20.01 |
| 2026-05-16 12:00 |
20:27:10.27 |
+00:07:37.4 |
HIP 100940 |
20.67 |
| 2026-05-17 00:00 |
20:27:09.26 |
+00:08:15.7 |
HIP 100940 |
21.33 |
| 2026-05-17 12:00 |
20:27:08.20 |
+00:08:53.7 |
HIP 100940 |
22.00 |
| 2026-05-18 00:00 |
20:27:07.08 |
+00:09:31.4 |
HIP 100940 |
22.68 |
| 2026-05-18 12:00 |
20:27:05.89 |
+00:10:08.8 |
HIP 100940 |
23.36 |
| 2026-05-19 00:00 |
20:27:04.65 |
+00:10:45.8 |
HIP 100940 |
24.04 |
| 2026-05-19 12:00 |
20:27:03.34 |
+00:11:22.6 |
HIP 100940 |
24.73 |
| 2026-05-20 00:00 |
20:27:01.98 |
+00:11:59.1 |
HIP 100940 |
25.43 |
| 2026-05-20 12:00 |
20:27:00.55 |
+00:12:35.2 |
HIP 100940 |
26.13 |
| 2026-05-21 00:00 |
20:26:59.06 |
+00:13:11.1 |
HIP 100940 |
26.83 |
| 2026-05-21 12:00 |
20:26:57.52 |
+00:13:46.6 |
HIP 100940 |
27.54 |
| 2026-05-22 00:00 |
20:26:55.91 |
+00:14:21.8 |
HIP 100940 |
28.25 |
| 2026-05-22 12:00 |
20:26:54.25 |
+00:14:56.7 |
HIP 100940 |
28.96 |
| 2026-05-23 00:00 |
20:26:52.52 |
+00:15:31.3 |
HIP 100940 |
29.68 |
| 2026-05-23 12:00 |
20:26:50.74 |
+00:16:05.5 |
HIP 100940 |
30.40 |
| 2026-05-24 00:00 |
20:26:48.90 |
+00:16:39.4 |
HIP 100940 |
31.13 |
| 2026-05-24 12:00 |
20:26:47.00 |
+00:17:13.0 |
HIP 100940 |
31.86 |
| 2026-05-25 00:00 |
20:26:45.04 |
+00:17:46.3 |
HIP 100940 |
32.60 |
| 2026-05-25 12:00 |
20:26:43.03 |
+00:18:19.3 |
HIP 100940 |
33.33 |
| 2026-05-26 00:00 |
20:26:40.96 |
+00:18:51.9 |
HIP 100940 |
34.08 |
| 2026-05-26 12:00 |
20:26:38.83 |
+00:19:24.2 |
HIP 100940 |
34.82 |
| 2026-05-27 00:00 |
20:26:36.64 |
+00:19:56.1 |
HIP 100940 |
35.57 |
| 2026-05-27 12:00 |
20:26:34.40 |
+00:20:27.7 |
HIP 100940 |
36.33 |
| 2026-05-28 00:00 |
20:26:32.09 |
+00:20:59.0 |
HIP 100940 |
37.09 |
| 2026-05-28 12:00 |
20:26:29.74 |
+00:21:29.9 |
HIP 100940 |
37.85 |
| 2026-05-29 00:00 |
20:26:27.32 |
+00:22:00.5 |
HIP 100940 |
38.62 |
| 2026-05-29 12:00 |
20:26:24.85 |
+00:22:30.8 |
HIP 100590 |
39.03 |
| 2026-05-30 00:00 |
20:26:22.33 |
+00:23:00.7 |
HIP 100590 |
38.30 |
| 2026-05-30 12:00 |
20:26:19.75 |
+00:23:30.2 |
HIP 100590 |
37.57 |
| 2026-05-31 00:00 |
20:26:17.11 |
+00:23:59.4 |
HIP 100590 |
36.82 |
| 2026-05-31 12:00 |
20:26:14.42 |
+00:24:28.3 |
HIP 100590 |
36.07 |
| 2026-06-01 00:00 |
20:26:11.68 |
+00:24:56.8 |
HIP 100590 |
35.31 |
| 2026-06-01 12:00 |
20:26:08.88 |
+00:25:25.0 |
HIP 100590 |
34.53 |
| 2026-06-02 00:00 |
20:26:06.02 |
+00:25:52.8 |
HIP 100590 |
33.75 |