| Parameter |
Value |
| Designation |
C/2020 T2 (Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-11T03:28:26.996160Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
2755 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-10-07T12:21:14.400000Z |
| Discovery magnitude (MPC) |
19.33 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-05-15.0000000 |
| e |
0.99342864 |
| q (au) |
2.054696 |
| a (au) |
312.674502 |
| i (deg) |
27.872916 |
| Ω (om, deg) |
83.048376 |
| ω (w, deg) |
150.381486 |
| M (ma, deg) |
359.989813 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.304 + 5.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.304 |
| n |
5.380 |
| gf |
1.000 |
| gb |
-0.950 |
| k |
0.999 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-12-11 |
2021-07-11 |
+4.3372 |
-2.066 |
| 2021-07-11 |
2022-09-21 |
+1.1158 |
-2.046 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
01:31:27.82 |
-17:45:45.3 |
HIP 7089 |
5.12 |
| 2026-05-12 12:00 |
01:31:35.64 |
-17:45:26.5 |
HIP 7135 |
5.85 |
| 2026-05-13 00:00 |
01:31:43.42 |
-17:45:08.2 |
HIP 7135 |
4.23 |
| 2026-05-13 12:00 |
01:31:51.18 |
-17:44:50.4 |
HIP 7135 |
2.96 |
| 2026-05-14 00:00 |
01:31:58.91 |
-17:44:33.2 |
HIP 7135 |
2.58 |
| 2026-05-14 12:00 |
01:32:06.60 |
-17:44:16.5 |
HIP 7135 |
3.39 |
| 2026-05-15 00:00 |
01:32:14.27 |
-17:44:00.4 |
HIP 7135 |
4.81 |
| 2026-05-15 12:00 |
01:32:21.91 |
-17:43:44.8 |
HIP 7135 |
6.45 |
| 2026-05-16 00:00 |
01:32:29.52 |
-17:43:29.7 |
HIP 7135 |
8.17 |
| 2026-05-16 12:00 |
01:32:37.10 |
-17:43:15.2 |
HIP 7212 |
7.68 |
| 2026-05-17 00:00 |
01:32:44.65 |
-17:43:01.2 |
HIP 7212 |
6.69 |
| 2026-05-17 12:00 |
01:32:52.16 |
-17:42:47.8 |
HIP 7212 |
6.11 |
| 2026-05-18 00:00 |
01:32:59.64 |
-17:42:34.9 |
HIP 7212 |
6.04 |
| 2026-05-18 12:00 |
01:33:07.09 |
-17:42:22.6 |
HIP 7212 |
6.49 |
| 2026-05-19 00:00 |
01:33:14.51 |
-17:42:10.8 |
HIP 7212 |
7.35 |
| 2026-05-19 12:00 |
01:33:21.89 |
-17:41:59.5 |
HIP 7212 |
8.51 |
| 2026-05-20 00:00 |
01:33:29.24 |
-17:41:48.8 |
HIP 7212 |
9.85 |
| 2026-05-20 12:00 |
01:33:36.56 |
-17:41:38.7 |
HIP 7212 |
11.30 |
| 2026-05-21 00:00 |
01:33:43.84 |
-17:41:29.1 |
HIP 7212 |
12.82 |
| 2026-05-21 12:00 |
01:33:51.08 |
-17:41:20.0 |
HIP 7212 |
14.39 |
| 2026-05-22 00:00 |
01:33:58.29 |
-17:41:11.5 |
HIP 7212 |
15.98 |
| 2026-05-22 12:00 |
01:34:05.47 |
-17:41:03.5 |
HIP 7212 |
17.59 |
| 2026-05-23 00:00 |
01:34:12.60 |
-17:40:56.1 |
HIP 7212 |
19.22 |
| 2026-05-23 12:00 |
01:34:19.71 |
-17:40:49.2 |
HIP 7212 |
20.85 |
| 2026-05-24 00:00 |
01:34:26.77 |
-17:40:42.9 |
HIP 7446 |
22.33 |
| 2026-05-24 12:00 |
01:34:33.80 |
-17:40:37.1 |
HIP 7446 |
20.76 |
| 2026-05-25 00:00 |
01:34:40.79 |
-17:40:31.9 |
HIP 7446 |
19.22 |
| 2026-05-25 12:00 |
01:34:47.74 |
-17:40:27.2 |
HIP 7446 |
17.72 |
| 2026-05-26 00:00 |
01:34:54.65 |
-17:40:23.1 |
HIP 7446 |
16.26 |
| 2026-05-26 12:00 |
01:35:01.53 |
-17:40:19.5 |
HIP 7446 |
14.85 |
| 2026-05-27 00:00 |
01:35:08.37 |
-17:40:16.4 |
HIP 7446 |
13.51 |
| 2026-05-27 12:00 |
01:35:15.16 |
-17:40:13.9 |
HIP 7446 |
12.25 |
| 2026-05-28 00:00 |
01:35:21.92 |
-17:40:11.9 |
HIP 7446 |
11.09 |
| 2026-05-28 12:00 |
01:35:28.64 |
-17:40:10.5 |
HIP 7446 |
10.08 |
| 2026-05-29 00:00 |
01:35:35.32 |
-17:40:09.6 |
HIP 7446 |
9.25 |
| 2026-05-29 12:00 |
01:35:41.95 |
-17:40:09.3 |
HIP 7446 |
8.64 |
| 2026-05-30 00:00 |
01:35:48.55 |
-17:40:09.5 |
HIP 7446 |
8.30 |
| 2026-05-30 12:00 |
01:35:55.10 |
-17:40:10.3 |
HIP 7446 |
8.27 |
| 2026-05-31 00:00 |
01:36:01.62 |
-17:40:11.6 |
HIP 7446 |
8.53 |
| 2026-05-31 12:00 |
01:36:08.09 |
-17:40:13.4 |
HIP 7446 |
9.06 |
| 2026-06-01 00:00 |
01:36:14.52 |
-17:40:15.8 |
HIP 7446 |
9.81 |
| 2026-06-01 12:00 |
01:36:20.91 |
-17:40:18.7 |
HIP 7446 |
10.72 |
| 2026-06-02 00:00 |
01:36:27.25 |
-17:40:22.2 |
HIP 7446 |
11.77 |