| 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) |
| 2026-03-26 00:00 |
20:23:24.58 |
-01:15:59.0 |
HIP 100572 |
12.35 |
| 2026-03-26 12:00 |
20:23:29.74 |
-01:15:04.9 |
HIP 100572 |
11.16 |
| 2026-03-27 00:00 |
20:23:34.84 |
-01:14:10.9 |
HIP 100572 |
10.06 |
| 2026-03-27 12:00 |
20:23:39.90 |
-01:13:17.0 |
HIP 100572 |
9.10 |
| 2026-03-28 00:00 |
20:23:44.90 |
-01:12:23.0 |
HIP 100572 |
8.33 |
| 2026-03-28 12:00 |
20:23:49.85 |
-01:11:29.0 |
HIP 100572 |
7.77 |
| 2026-03-29 00:00 |
20:23:54.74 |
-01:10:35.1 |
HIP 100572 |
7.49 |
| 2026-03-29 12:00 |
20:23:59.58 |
-01:09:41.2 |
HIP 100572 |
7.50 |
| 2026-03-30 00:00 |
20:24:04.37 |
-01:08:47.3 |
HIP 100572 |
7.80 |
| 2026-03-30 12:00 |
20:24:09.11 |
-01:07:53.5 |
HIP 100572 |
8.35 |
| 2026-03-31 00:00 |
20:24:13.79 |
-01:06:59.6 |
HIP 100572 |
9.09 |
| 2026-03-31 12:00 |
20:24:18.42 |
-01:06:05.8 |
HIP 100572 |
9.99 |
| 2026-04-01 00:00 |
20:24:22.99 |
-01:05:12.1 |
HIP 100572 |
11.00 |
| 2026-04-01 12:00 |
20:24:27.51 |
-01:04:18.4 |
HIP 100572 |
12.08 |
| 2026-04-02 00:00 |
20:24:31.97 |
-01:03:24.7 |
HIP 100572 |
13.22 |
| 2026-04-02 12:00 |
20:24:36.38 |
-01:02:31.1 |
HIP 100572 |
14.39 |
| 2026-04-03 00:00 |
20:24:40.73 |
-01:01:37.5 |
HIP 100572 |
15.59 |
| 2026-04-03 12:00 |
20:24:45.03 |
-01:00:44.0 |
HIP 100572 |
16.81 |
| 2026-04-04 00:00 |
20:24:49.27 |
-00:59:50.5 |
HIP 100572 |
18.05 |
| 2026-04-04 12:00 |
20:24:53.46 |
-00:58:57.1 |
HIP 100572 |
19.29 |
| 2026-04-05 00:00 |
20:24:57.59 |
-00:58:03.7 |
HIP 100572 |
20.53 |
| 2026-04-05 12:00 |
20:25:01.66 |
-00:57:10.4 |
HIP 100572 |
21.77 |
| 2026-04-06 00:00 |
20:25:05.68 |
-00:56:17.1 |
HIP 100572 |
23.02 |
| 2026-04-06 12:00 |
20:25:09.64 |
-00:55:24.0 |
HIP 100572 |
24.26 |
| 2026-04-07 00:00 |
20:25:13.55 |
-00:54:30.8 |
HIP 100572 |
25.49 |
| 2026-04-07 12:00 |
20:25:17.39 |
-00:53:37.8 |
HIP 100618 |
25.98 |
| 2026-04-08 00:00 |
20:25:21.18 |
-00:52:44.8 |
HIP 100618 |
25.96 |
| 2026-04-08 12:00 |
20:25:24.91 |
-00:51:51.9 |
HIP 100618 |
26.01 |
| 2026-04-09 00:00 |
20:25:28.59 |
-00:50:59.1 |
HIP 100618 |
26.10 |
| 2026-04-09 12:00 |
20:25:32.20 |
-00:50:06.4 |
HIP 100618 |
26.25 |
| 2026-04-10 00:00 |
20:25:35.76 |
-00:49:13.8 |
HIP 100618 |
26.45 |
| 2026-04-10 12:00 |
20:25:39.26 |
-00:48:21.2 |
HIP 100618 |
26.69 |
| 2026-04-11 00:00 |
20:25:42.70 |
-00:47:28.8 |
HIP 100618 |
26.97 |
| 2026-04-11 12:00 |
20:25:46.08 |
-00:46:36.4 |
HIP 100618 |
27.30 |
| 2026-04-12 00:00 |
20:25:49.41 |
-00:45:44.1 |
HIP 100618 |
27.66 |
| 2026-04-12 12:00 |
20:25:52.67 |
-00:44:52.0 |
HIP 100618 |
28.05 |
| 2026-04-13 00:00 |
20:25:55.88 |
-00:44:00.0 |
HIP 100618 |
28.48 |
| 2026-04-13 12:00 |
20:25:59.02 |
-00:43:08.0 |
HIP 100618 |
28.93 |
| 2026-04-14 00:00 |
20:26:02.11 |
-00:42:16.1 |
HIP 100618 |
29.41 |
| 2026-04-14 12:00 |
20:26:05.13 |
-00:41:24.4 |
HIP 100618 |
29.91 |
| 2026-04-15 00:00 |
20:26:08.10 |
-00:40:32.8 |
HIP 100618 |
30.44 |
| 2026-04-15 12:00 |
20:26:11.00 |
-00:39:41.3 |
HIP 100618 |
30.98 |
| 2026-04-16 00:00 |
20:26:13.84 |
-00:38:49.9 |
HIP 100618 |
31.54 |