메타데이터
| 항목 |
값 |
| Designation |
P/2020 V4 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-17T22:00:33.958080Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:49Z |
| Obs used |
619 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-15T08:54:34.099200Z |
| Discovery magnitude (MPC) |
19.23 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-07-15.0000000 |
| e |
0.44887531 |
| q (au) |
5.148536 |
| a (au) |
9.341871 |
| i (deg) |
14.243119 |
| Ω (om, deg) |
203.507931 |
| ω (w, deg) |
256.995659 |
| M (ma, deg) |
359.899307 |
밝기
산란 + 전체 선형
$$
M_a = (3.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.987 |
| n |
6.000 |
| gf |
0.897 |
| gb |
-0.891 |
| k |
1.000 |
| δ90 |
4.956 |
| 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 |
| 2015-10-10 |
2019-11-02 |
-11.2590 |
+10.593 |
| 2019-11-02 |
2021-04-21 |
+31.2874 |
-22.459 |
| 2021-08-30 |
2023-03-21 |
+28.4984 |
-21.118 |
| 2023-03-21 |
2024-03-17 |
-8.3402 |
+7.840 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
14:01:04.00 |
-09:18:26.6 |
HIP 68371 |
28.35 |
| 2026-05-12 12:00 |
14:00:55.45 |
-09:17:27.1 |
HIP 68371 |
27.66 |
| 2026-05-13 00:00 |
14:00:46.95 |
-09:16:27.9 |
HIP 68371 |
27.16 |
| 2026-05-13 12:00 |
14:00:38.50 |
-09:15:29.1 |
HIP 68371 |
26.86 |
| 2026-05-14 00:00 |
14:00:30.09 |
-09:14:30.7 |
HIP 68371 |
26.75 |
| 2026-05-14 12:00 |
14:00:21.74 |
-09:13:32.6 |
HIP 68371 |
26.83 |
| 2026-05-15 00:00 |
14:00:13.44 |
-09:12:34.8 |
HIP 68371 |
27.10 |
| 2026-05-15 12:00 |
14:00:05.19 |
-09:11:37.4 |
HIP 68371 |
27.56 |
| 2026-05-16 00:00 |
13:59:56.99 |
-09:10:40.5 |
HIP 68241 |
26.82 |
| 2026-05-16 12:00 |
13:59:48.85 |
-09:09:43.9 |
HIP 68241 |
24.63 |
| 2026-05-17 00:00 |
13:59:40.76 |
-09:08:47.6 |
HIP 68241 |
22.46 |
| 2026-05-17 12:00 |
13:59:32.73 |
-09:07:51.8 |
HIP 68241 |
20.32 |
| 2026-05-18 00:00 |
13:59:24.75 |
-09:06:56.4 |
HIP 68241 |
18.19 |
| 2026-05-18 12:00 |
13:59:16.84 |
-09:06:01.4 |
HIP 68241 |
16.10 |
| 2026-05-19 00:00 |
13:59:08.98 |
-09:05:06.8 |
HIP 68241 |
14.04 |
| 2026-05-19 12:00 |
13:59:01.19 |
-09:04:12.6 |
HIP 68241 |
12.03 |
| 2026-05-20 00:00 |
13:58:53.45 |
-09:03:18.9 |
HIP 68241 |
10.07 |
| 2026-05-20 12:00 |
13:58:45.78 |
-09:02:25.5 |
HIP 68241 |
8.21 |
| 2026-05-21 00:00 |
13:58:38.18 |
-09:01:32.7 |
HIP 68241 |
6.51 |
| 2026-05-21 12:00 |
13:58:30.63 |
-09:00:40.2 |
HIP 68241 |
5.09 |
| 2026-05-22 00:00 |
13:58:23.16 |
-08:59:48.2 |
HIP 68241 |
4.25 |
| 2026-05-22 12:00 |
13:58:15.74 |
-08:58:56.6 |
HIP 68241 |
4.29 |
| 2026-05-23 00:00 |
13:58:08.40 |
-08:58:05.5 |
HIP 68241 |
5.18 |
| 2026-05-23 12:00 |
13:58:01.12 |
-08:57:14.9 |
HIP 68241 |
6.57 |
| 2026-05-24 00:00 |
13:57:53.91 |
-08:56:24.7 |
HIP 68241 |
8.19 |
| 2026-05-24 12:00 |
13:57:46.77 |
-08:55:35.0 |
HIP 68241 |
9.92 |
| 2026-05-25 00:00 |
13:57:39.70 |
-08:54:45.7 |
HIP 68241 |
11.70 |
| 2026-05-25 12:00 |
13:57:32.71 |
-08:53:56.9 |
HIP 68241 |
13.50 |
| 2026-05-26 00:00 |
13:57:25.78 |
-08:53:08.6 |
HIP 68241 |
15.31 |
| 2026-05-26 12:00 |
13:57:18.92 |
-08:52:20.8 |
HIP 68241 |
17.12 |
| 2026-05-27 00:00 |
13:57:12.14 |
-08:51:33.4 |
HIP 68241 |
18.93 |
| 2026-05-27 12:00 |
13:57:05.43 |
-08:50:46.6 |
HIP 68241 |
20.72 |
| 2026-05-28 00:00 |
13:56:58.80 |
-08:50:00.2 |
HIP 68241 |
22.50 |
| 2026-05-28 12:00 |
13:56:52.24 |
-08:49:14.3 |
HIP 68241 |
24.26 |
| 2026-05-29 00:00 |
13:56:45.76 |
-08:48:28.9 |
HIP 68241 |
26.01 |
| 2026-05-29 12:00 |
13:56:39.35 |
-08:47:44.1 |
HIP 67967 |
25.06 |
| 2026-05-30 00:00 |
13:56:33.02 |
-08:46:59.7 |
HIP 67967 |
23.33 |
| 2026-05-30 12:00 |
13:56:26.77 |
-08:46:15.8 |
HIP 67967 |
21.62 |
| 2026-05-31 00:00 |
13:56:20.59 |
-08:45:32.5 |
HIP 67967 |
19.93 |
| 2026-05-31 12:00 |
13:56:14.49 |
-08:44:49.6 |
HIP 67967 |
18.26 |
| 2026-06-01 00:00 |
13:56:08.48 |
-08:44:07.3 |
HIP 67967 |
16.62 |
| 2026-06-01 12:00 |
13:56:02.54 |
-08:43:25.5 |
HIP 67967 |
15.00 |
| 2026-06-02 00:00 |
13:55:56.68 |
-08:42:44.2 |
HIP 67967 |
13.39 |