| Parameter |
Value |
| Designation |
415P/Tenagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-16T03:55:08.005440Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:05:50Z |
| Obs used |
199 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
19.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-25T13:33:49.824000Z |
| Discovery magnitude (MPC) |
21.10 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-11-04.0000000 |
| e |
0.19516380 |
| q (au) |
3.311953 |
| a (au) |
4.115065 |
| i (deg) |
31.789340 |
| Ω (om, deg) |
160.325572 |
| ω (w, deg) |
346.450161 |
| M (ma, deg) |
261.392377 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.505 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.732 |
| k |
0.964 |
| 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 |
00:32:12.75 |
-05:46:04.9 |
HIP 2566 |
26.92 |
| 2026-05-12 12:00 |
00:32:37.18 |
-05:45:17.5 |
HIP 2699 |
24.52 |
| 2026-05-13 00:00 |
00:33:01.55 |
-05:44:30.9 |
HIP 2699 |
18.45 |
| 2026-05-13 12:00 |
00:33:25.85 |
-05:43:45.2 |
HIP 2699 |
12.43 |
| 2026-05-14 00:00 |
00:33:50.09 |
-05:43:00.5 |
HIP 2699 |
6.56 |
| 2026-05-14 12:00 |
00:34:14.27 |
-05:42:16.6 |
HIP 2699 |
2.32 |
| 2026-05-15 00:00 |
00:34:38.39 |
-05:41:33.7 |
HIP 2699 |
6.39 |
| 2026-05-15 12:00 |
00:35:02.44 |
-05:40:51.6 |
HIP 2699 |
12.20 |
| 2026-05-16 00:00 |
00:35:26.42 |
-05:40:10.5 |
HIP 2843 |
10.61 |
| 2026-05-16 12:00 |
00:35:50.34 |
-05:39:30.4 |
HIP 2843 |
5.99 |
| 2026-05-17 00:00 |
00:36:14.19 |
-05:38:51.2 |
HIP 2843 |
5.57 |
| 2026-05-17 12:00 |
00:36:37.97 |
-05:38:12.9 |
HIP 2843 |
9.86 |
| 2026-05-18 00:00 |
00:37:01.68 |
-05:37:35.6 |
HIP 2843 |
15.29 |
| 2026-05-18 12:00 |
00:37:25.32 |
-05:36:59.2 |
HIP 2843 |
20.98 |
| 2026-05-19 00:00 |
00:37:48.90 |
-05:36:23.9 |
HIP 2980 |
23.56 |
| 2026-05-19 12:00 |
00:38:12.40 |
-05:35:49.5 |
HIP 2980 |
24.36 |
| 2026-05-20 00:00 |
00:38:35.83 |
-05:35:16.1 |
HIP 2980 |
26.45 |
| 2026-05-20 12:00 |
00:38:59.18 |
-05:34:43.7 |
HIP 2980 |
29.54 |
| 2026-05-21 00:00 |
00:39:22.47 |
-05:34:12.3 |
HIP 2980 |
33.35 |
| 2026-05-21 12:00 |
00:39:45.68 |
-05:33:41.8 |
HIP 2980 |
37.65 |
| 2026-05-22 00:00 |
00:40:08.81 |
-05:33:12.4 |
HIP 2980 |
42.29 |
| 2026-05-22 12:00 |
00:40:31.87 |
-05:32:44.1 |
HIP 2980 |
47.15 |
| 2026-05-23 00:00 |
00:40:54.86 |
-05:32:16.7 |
HIP 3313 |
46.60 |
| 2026-05-23 12:00 |
00:41:17.76 |
-05:31:50.3 |
HIP 3313 |
45.00 |
| 2026-05-24 00:00 |
00:41:40.60 |
-05:31:25.0 |
HIP 3486 |
42.75 |
| 2026-05-24 12:00 |
00:42:03.35 |
-05:31:00.8 |
HIP 3486 |
37.23 |
| 2026-05-25 00:00 |
00:42:26.02 |
-05:30:37.5 |
HIP 3486 |
31.77 |
| 2026-05-25 12:00 |
00:42:48.62 |
-05:30:15.4 |
HIP 3486 |
26.41 |
| 2026-05-26 00:00 |
00:43:11.14 |
-05:29:54.2 |
HIP 3486 |
21.21 |
| 2026-05-26 12:00 |
00:43:33.57 |
-05:29:34.2 |
HIP 3486 |
16.30 |
| 2026-05-27 00:00 |
00:43:55.93 |
-05:29:15.2 |
HIP 3486 |
11.99 |
| 2026-05-27 12:00 |
00:44:18.20 |
-05:28:57.3 |
HIP 3486 |
9.16 |
| 2026-05-28 00:00 |
00:44:40.40 |
-05:28:40.4 |
HIP 3486 |
9.23 |
| 2026-05-28 12:00 |
00:45:02.51 |
-05:28:24.7 |
HIP 3486 |
12.12 |
| 2026-05-29 00:00 |
00:45:24.53 |
-05:28:10.0 |
HIP 3600 |
14.93 |
| 2026-05-29 12:00 |
00:45:46.48 |
-05:27:56.4 |
HIP 3600 |
11.85 |
| 2026-05-30 00:00 |
00:46:08.33 |
-05:27:44.0 |
HIP 3600 |
10.83 |
| 2026-05-30 12:00 |
00:46:30.11 |
-05:27:32.6 |
HIP 3600 |
12.36 |
| 2026-05-31 00:00 |
00:46:51.79 |
-05:27:22.4 |
HIP 3600 |
15.69 |
| 2026-05-31 12:00 |
00:47:13.39 |
-05:27:13.3 |
HIP 3600 |
19.91 |
| 2026-06-01 00:00 |
00:47:34.90 |
-05:27:05.3 |
HIP 3757 |
21.24 |
| 2026-06-01 12:00 |
00:47:56.33 |
-05:26:58.4 |
HIP 3757 |
19.33 |
| 2026-06-02 00:00 |
00:48:17.66 |
-05:26:52.7 |
HIP 3757 |
18.80 |