메타데이터
| 항목 |
값 |
| Designation |
C/2020 PV6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-25T23:59:11.313600Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
1749 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
17.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-09-30.0000000 |
| e |
0.94495091 |
| q (au) |
2.295631 |
| a (au) |
41.701535 |
| i (deg) |
128.239287 |
| Ω (om, deg) |
329.143872 |
| ω (w, deg) |
71.380642 |
| M (ma, deg) |
0.014642 |
밝기
산란 + 전체 선형
$$
M_a = (6.667 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.667 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2021-05-30 |
2021-09-22 |
+4.0425 |
-1.521 |
| 2021-09-26 |
2022-05-23 |
+13.2958 |
-5.599 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
08:35:34.70 |
-01:02:42.6 |
HIP 42074 |
24.78 |
| 2026-07-29 12:00 |
08:35:41.45 |
-01:03:22.4 |
HIP 42074 |
26.38 |
| 2026-07-30 00:00 |
08:35:48.19 |
-01:04:02.5 |
HIP 42074 |
28.00 |
| 2026-07-30 12:00 |
08:35:54.93 |
-01:04:43.0 |
HIP 42325 |
27.54 |
| 2026-07-31 00:00 |
08:36:01.67 |
-01:05:23.7 |
HIP 42325 |
25.80 |
| 2026-07-31 12:00 |
08:36:08.40 |
-01:06:04.8 |
HIP 42325 |
24.06 |
| 2026-08-01 00:00 |
08:36:15.13 |
-01:06:46.2 |
HIP 42325 |
22.35 |
| 2026-08-01 12:00 |
08:36:21.86 |
-01:07:27.9 |
HIP 42325 |
20.65 |
| 2026-08-02 00:00 |
08:36:28.57 |
-01:08:10.0 |
HIP 42325 |
18.97 |
| 2026-08-02 12:00 |
08:36:35.29 |
-01:08:52.3 |
HIP 42325 |
17.32 |
| 2026-08-03 00:00 |
08:36:41.99 |
-01:09:35.0 |
HIP 42325 |
15.72 |
| 2026-08-03 12:00 |
08:36:48.70 |
-01:10:18.0 |
HIP 42325 |
14.17 |
| 2026-08-04 00:00 |
08:36:55.39 |
-01:11:01.3 |
HIP 42325 |
12.69 |
| 2026-08-04 12:00 |
08:37:02.08 |
-01:11:44.9 |
HIP 42325 |
11.32 |
| 2026-08-05 00:00 |
08:37:08.76 |
-01:12:28.8 |
HIP 42325 |
10.10 |
| 2026-08-05 12:00 |
08:37:15.43 |
-01:13:13.0 |
HIP 42325 |
9.09 |
| 2026-08-06 00:00 |
08:37:22.09 |
-01:13:57.5 |
HIP 42325 |
8.36 |
| 2026-08-06 12:00 |
08:37:28.74 |
-01:14:42.4 |
HIP 42325 |
7.99 |
| 2026-08-07 00:00 |
08:37:35.39 |
-01:15:27.5 |
HIP 42325 |
8.04 |
| 2026-08-07 12:00 |
08:37:42.02 |
-01:16:12.9 |
HIP 42325 |
8.49 |
| 2026-08-08 00:00 |
08:37:48.64 |
-01:16:58.6 |
HIP 42325 |
9.29 |
| 2026-08-08 12:00 |
08:37:55.26 |
-01:17:44.7 |
HIP 42325 |
10.36 |
| 2026-08-09 00:00 |
08:38:01.86 |
-01:18:31.0 |
HIP 42325 |
11.62 |
| 2026-08-09 12:00 |
08:38:08.45 |
-01:19:17.6 |
HIP 42325 |
13.01 |
| 2026-08-10 00:00 |
08:38:15.03 |
-01:20:04.5 |
HIP 42325 |
14.51 |
| 2026-08-10 12:00 |
08:38:21.59 |
-01:20:51.7 |
HIP 42325 |
16.07 |
| 2026-08-11 00:00 |
08:38:28.14 |
-01:21:39.2 |
HIP 42325 |
17.68 |
| 2026-08-11 12:00 |
08:38:34.68 |
-01:22:27.0 |
HIP 42325 |
19.33 |
| 2026-08-12 00:00 |
08:38:41.20 |
-01:23:15.0 |
HIP 42325 |
21.01 |
| 2026-08-12 12:00 |
08:38:47.71 |
-01:24:03.3 |
HIP 42325 |
22.72 |
| 2026-08-13 00:00 |
08:38:54.20 |
-01:24:52.0 |
HIP 42325 |
24.43 |
| 2026-08-13 12:00 |
08:39:00.68 |
-01:25:40.8 |
HIP 42547 |
23.32 |
| 2026-08-14 00:00 |
08:39:07.14 |
-01:26:30.0 |
HIP 42547 |
21.51 |
| 2026-08-14 12:00 |
08:39:13.58 |
-01:27:19.4 |
HIP 42547 |
19.70 |
| 2026-08-15 00:00 |
08:39:20.01 |
-01:28:09.1 |
HIP 42547 |
17.90 |
| 2026-08-15 12:00 |
08:39:26.42 |
-01:28:59.1 |
HIP 42547 |
16.10 |
| 2026-08-16 00:00 |
08:39:32.81 |
-01:29:49.3 |
HIP 42547 |
14.29 |
| 2026-08-16 12:00 |
08:39:39.18 |
-01:30:39.8 |
HIP 42547 |
12.50 |
| 2026-08-17 00:00 |
08:39:45.53 |
-01:31:30.6 |
HIP 42547 |
10.70 |
| 2026-08-17 12:00 |
08:39:51.86 |
-01:32:21.6 |
HIP 42547 |
8.91 |
| 2026-08-18 00:00 |
08:39:58.17 |
-01:33:12.9 |
HIP 42547 |
7.12 |
| 2026-08-18 12:00 |
08:40:04.47 |
-01:34:04.4 |
HIP 42547 |
5.33 |
| 2026-08-19 00:00 |
08:40:10.74 |
-01:34:56.1 |
HIP 42547 |
3.55 |