C/2020 V2 (ZTF)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2020 V2 (ZTF) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2023-05-08T13:21:29.376000Z |
| Orbit solution date (soln_date, UTC) | 2025-09-30T13:39:21Z |
| Obs used | 5767 |
| NEO | - |
| M1 | 8.700 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2020-11-02T12:42:20.160000Z |
| Discovery magnitude (MPC) | 19.04 r |
| Discovery observatory (MPC) | I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-10-07.0000000 |
| e | 1.00089953 |
| q (au) | 2.227960 |
| a (au) | -2476.803384 |
| i (deg) | 131.611042 |
| Ω (om, deg) | 212.371235 |
| ω (w, deg) | 162.424317 |
| M (ma, deg) | -0.001708 |
Magnitude
Scatter + Global Linear
$$ M_a = (8.951 + 2.985\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 8.951 |
| n | 2.985 |
| gf | 1.000 |
| gb | -0.726 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2020-04-18 | 2022-11-29 | +2.8905 | -2.125 |
| 2022-11-29 | 2023-04-18 | +1.1777 | -1.001 |
| 2023-06-12 | 2023-08-25 | +25.9574 | -10.877 |
| 2023-08-25 | 2024-05-20 | -2.9823 | +1.312 |
| 2024-05-20 | 2025-10-26 | +0.5312 | -0.877 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 20:19:31.01 | -66:42:24.8 | HIP 100215 | 10.56 |
| 2026-03-26 12:00 | 20:19:37.50 | -66:44:18.5 | HIP 100215 | 8.67 |
| 2026-03-27 00:00 | 20:19:43.78 | -66:46:12.9 | HIP 100215 | 6.83 |
| 2026-03-27 12:00 | 20:19:49.85 | -66:48:08.2 | HIP 100215 | 5.10 |
| 2026-03-28 00:00 | 20:19:55.71 | -66:50:04.2 | HIP 100215 | 3.65 |
| 2026-03-28 12:00 | 20:20:01.35 | -66:52:00.9 | HIP 100215 | 2.92 |
| 2026-03-29 00:00 | 20:20:06.78 | -66:53:58.4 | HIP 100215 | 3.44 |
| 2026-03-29 12:00 | 20:20:11.98 | -66:55:56.7 | HIP 100215 | 4.83 |
| 2026-03-30 00:00 | 20:20:16.97 | -66:57:55.7 | HIP 100215 | 6.56 |
| 2026-03-30 12:00 | 20:20:21.74 | -66:59:55.5 | HIP 100215 | 8.43 |
| 2026-03-31 00:00 | 20:20:26.28 | -67:01:56.0 | HIP 100215 | 10.36 |
| 2026-03-31 12:00 | 20:20:30.60 | -67:03:57.2 | HIP 100215 | 12.34 |
| 2026-04-01 00:00 | 20:20:34.69 | -67:05:59.1 | HIP 100396 | 14.08 |
| 2026-04-01 12:00 | 20:20:38.55 | -67:08:01.7 | HIP 100396 | 12.07 |
| 2026-04-02 00:00 | 20:20:42.19 | -67:10:05.1 | HIP 100396 | 10.10 |
| 2026-04-02 12:00 | 20:20:45.59 | -67:12:09.2 | HIP 100396 | 8.19 |
| 2026-04-03 00:00 | 20:20:48.76 | -67:14:13.9 | HIP 100396 | 6.40 |
| 2026-04-03 12:00 | 20:20:51.69 | -67:16:19.3 | HIP 100396 | 4.89 |
| 2026-04-04 00:00 | 20:20:54.39 | -67:18:25.5 | HIP 100396 | 3.98 |
| 2026-04-04 12:00 | 20:20:56.85 | -67:20:32.2 | HIP 100396 | 4.12 |
| 2026-04-05 00:00 | 20:20:59.07 | -67:22:39.7 | HIP 100396 | 5.24 |
| 2026-04-05 12:00 | 20:21:01.04 | -67:24:47.8 | HIP 100396 | 6.88 |
| 2026-04-06 00:00 | 20:21:02.77 | -67:26:56.6 | HIP 100396 | 8.76 |
| 2026-04-06 12:00 | 20:21:04.25 | -67:29:06.0 | HIP 100396 | 10.75 |
| 2026-04-07 00:00 | 20:21:05.49 | -67:31:16.1 | HIP 100396 | 12.82 |
| 2026-04-07 12:00 | 20:21:06.47 | -67:33:26.7 | HIP 100396 | 14.93 |
| 2026-04-08 00:00 | 20:21:07.20 | -67:35:38.0 | HIP 100396 | 17.08 |
| 2026-04-08 12:00 | 20:21:07.68 | -67:37:50.0 | HIP 100624 | 17.89 |
| 2026-04-09 00:00 | 20:21:07.90 | -67:40:02.5 | HIP 100624 | 18.23 |
| 2026-04-09 12:00 | 20:21:07.86 | -67:42:15.6 | HIP 100624 | 18.86 |
| 2026-04-10 00:00 | 20:21:07.56 | -67:44:29.3 | HIP 100624 | 19.74 |
| 2026-04-10 12:00 | 20:21:07.00 | -67:46:43.6 | HIP 100624 | 20.85 |
| 2026-04-11 00:00 | 20:21:06.17 | -67:48:58.5 | HIP 100624 | 22.16 |
| 2026-04-11 12:00 | 20:21:05.08 | -67:51:13.9 | HIP 100624 | 23.64 |
| 2026-04-12 00:00 | 20:21:03.71 | -67:53:29.9 | HIP 100624 | 25.25 |
| 2026-04-12 12:00 | 20:21:02.08 | -67:55:46.4 | HIP 100624 | 26.99 |
| 2026-04-13 00:00 | 20:21:00.17 | -67:58:03.5 | HIP 100624 | 28.82 |
| 2026-04-13 12:00 | 20:20:57.99 | -68:00:21.0 | HIP 100624 | 30.74 |
| 2026-04-14 00:00 | 20:20:55.53 | -68:02:39.1 | HIP 100063 | 31.12 |
| 2026-04-14 12:00 | 20:20:52.79 | -68:04:57.7 | HIP 100063 | 29.02 |
| 2026-04-15 00:00 | 20:20:49.77 | -68:07:16.8 | HIP 100063 | 26.93 |
| 2026-04-15 12:00 | 20:20:46.47 | -68:09:36.4 | HIP 100063 | 24.86 |
| 2026-04-16 00:00 | 20:20:42.88 | -68:11:56.4 | HIP 100063 | 22.82 |