| Parameter |
Value |
| Designation |
C/2014 F2 (Tenagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-01-02T07:05:02.428800Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
300 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-08-06.0000000 |
| e |
0.97089096 |
| q (au) |
4.314459 |
| a (au) |
148.217132 |
| i (deg) |
119.061202 |
| Ω (om, deg) |
267.449809 |
| ω (w, deg) |
86.041144 |
| M (ma, deg) |
359.918454 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.987 |
| n |
6.000 |
| gf |
0.988 |
| gb |
-0.593 |
| k |
0.800 |
| δ90 |
9.775 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2013-06-19 |
2014-10-02 |
+8.8067 |
-5.851 |
| 2015-02-09 |
2015-12-10 |
-5.8148 |
+3.628 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:40:10.29 |
-09:33:42.8 |
HIP 21765 |
22.46 |
| 2026-06-01 12:00 |
04:40:14.69 |
-09:33:41.7 |
HIP 21765 |
22.24 |
| 2026-06-02 00:00 |
04:40:19.09 |
-09:33:40.9 |
HIP 21765 |
22.08 |
| 2026-06-02 12:00 |
04:40:23.50 |
-09:33:40.4 |
HIP 21765 |
21.97 |
| 2026-06-03 00:00 |
04:40:27.90 |
-09:33:40.2 |
HIP 21765 |
21.92 |
| 2026-06-03 12:00 |
04:40:32.31 |
-09:33:40.3 |
HIP 21765 |
21.93 |
| 2026-06-04 00:00 |
04:40:36.71 |
-09:33:40.7 |
HIP 21765 |
22.00 |
| 2026-06-04 12:00 |
04:40:41.11 |
-09:33:41.4 |
HIP 21765 |
22.13 |
| 2026-06-05 00:00 |
04:40:45.51 |
-09:33:42.5 |
HIP 21765 |
22.32 |
| 2026-06-05 12:00 |
04:40:49.90 |
-09:33:43.8 |
HIP 21765 |
22.56 |
| 2026-06-06 00:00 |
04:40:54.30 |
-09:33:45.5 |
HIP 21765 |
22.85 |
| 2026-06-06 12:00 |
04:40:58.69 |
-09:33:47.4 |
HIP 21765 |
23.20 |
| 2026-06-07 00:00 |
04:41:03.08 |
-09:33:49.7 |
HIP 21765 |
23.60 |
| 2026-06-07 12:00 |
04:41:07.47 |
-09:33:52.3 |
HIP 21765 |
24.04 |
| 2026-06-08 00:00 |
04:41:11.85 |
-09:33:55.1 |
HIP 21765 |
24.53 |
| 2026-06-08 12:00 |
04:41:16.23 |
-09:33:58.3 |
HIP 21765 |
25.05 |
| 2026-06-09 00:00 |
04:41:20.61 |
-09:34:01.8 |
HIP 21765 |
25.62 |
| 2026-06-09 12:00 |
04:41:24.98 |
-09:34:05.7 |
HIP 21765 |
26.22 |
| 2026-06-10 00:00 |
04:41:29.35 |
-09:34:09.8 |
HIP 21963 |
26.54 |
| 2026-06-10 12:00 |
04:41:33.71 |
-09:34:14.2 |
HIP 21963 |
25.47 |
| 2026-06-11 00:00 |
04:41:38.07 |
-09:34:19.0 |
HIP 21963 |
24.39 |
| 2026-06-11 12:00 |
04:41:42.42 |
-09:34:24.0 |
HIP 21963 |
23.32 |
| 2026-06-12 00:00 |
04:41:46.77 |
-09:34:29.4 |
HIP 21963 |
22.24 |
| 2026-06-12 12:00 |
04:41:51.11 |
-09:34:35.1 |
HIP 21963 |
21.17 |
| 2026-06-13 00:00 |
04:41:55.45 |
-09:34:41.1 |
HIP 21963 |
20.09 |
| 2026-06-13 12:00 |
04:41:59.78 |
-09:34:47.4 |
HIP 21963 |
19.02 |
| 2026-06-14 00:00 |
04:42:04.10 |
-09:34:54.1 |
HIP 21963 |
17.95 |
| 2026-06-14 12:00 |
04:42:08.41 |
-09:35:01.0 |
HIP 21963 |
16.88 |
| 2026-06-15 00:00 |
04:42:12.72 |
-09:35:08.3 |
HIP 21963 |
15.81 |
| 2026-06-15 12:00 |
04:42:17.02 |
-09:35:15.9 |
HIP 21963 |
14.75 |
| 2026-06-16 00:00 |
04:42:21.31 |
-09:35:23.8 |
HIP 21963 |
13.68 |
| 2026-06-16 12:00 |
04:42:25.59 |
-09:35:32.0 |
HIP 21963 |
12.62 |
| 2026-06-17 00:00 |
04:42:29.86 |
-09:35:40.5 |
HIP 21963 |
11.55 |
| 2026-06-17 12:00 |
04:42:34.13 |
-09:35:49.4 |
HIP 21963 |
10.49 |
| 2026-06-18 00:00 |
04:42:38.38 |
-09:35:58.5 |
HIP 21963 |
9.43 |
| 2026-06-18 12:00 |
04:42:42.62 |
-09:36:08.0 |
HIP 21963 |
8.38 |
| 2026-06-19 00:00 |
04:42:46.86 |
-09:36:17.8 |
HIP 21963 |
7.32 |
| 2026-06-19 12:00 |
04:42:51.08 |
-09:36:27.9 |
HIP 21963 |
6.27 |
| 2026-06-20 00:00 |
04:42:55.30 |
-09:36:38.3 |
HIP 21963 |
5.22 |
| 2026-06-20 12:00 |
04:42:59.50 |
-09:36:49.0 |
HIP 21963 |
4.17 |
| 2026-06-21 00:00 |
04:43:03.69 |
-09:37:00.1 |
HIP 21963 |
3.13 |
| 2026-06-21 12:00 |
04:43:07.87 |
-09:37:11.4 |
HIP 21963 |
2.10 |
| 2026-06-22 00:00 |
04:43:12.04 |
-09:37:23.1 |
HIP 21963 |
1.11 |