메타데이터
| 항목 |
값 |
| Designation |
P/2021 R5 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-01-11T23:34:59.966400Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:24Z |
| Obs used |
251 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
18.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-09-09T06:52:28.416000Z |
| Discovery magnitude (MPC) |
19.34 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-10-17.0000000 |
| e |
0.30753521 |
| q (au) |
3.322719 |
| a (au) |
4.798394 |
| i (deg) |
7.852203 |
| Ω (om, deg) |
219.963779 |
| ω (w, deg) |
167.335702 |
| M (ma, deg) |
351.843709 |
밝기
산란 + 전체 선형
$$
M_a = (8.399 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.399 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.934 |
| k |
1.000 |
| δ90 |
9.557 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
12:16:12.70 |
-05:16:07.7 |
HIP 59849 |
34.70 |
| 2026-07-29 12:00 |
12:16:27.02 |
-05:17:15.1 |
HIP 60006 |
32.94 |
| 2026-07-30 00:00 |
12:16:41.42 |
-05:18:23.1 |
HIP 60006 |
30.42 |
| 2026-07-30 12:00 |
12:16:55.91 |
-05:19:31.8 |
HIP 60006 |
28.16 |
| 2026-07-31 00:00 |
12:17:10.48 |
-05:20:41.2 |
HIP 60006 |
26.25 |
| 2026-07-31 12:00 |
12:17:25.14 |
-05:21:51.2 |
HIP 60006 |
24.78 |
| 2026-08-01 00:00 |
12:17:39.88 |
-05:23:01.8 |
HIP 60006 |
23.84 |
| 2026-08-01 12:00 |
12:17:54.70 |
-05:24:13.0 |
HIP 60006 |
23.51 |
| 2026-08-02 00:00 |
12:18:09.60 |
-05:25:24.9 |
HIP 60006 |
23.81 |
| 2026-08-02 12:00 |
12:18:24.59 |
-05:26:37.4 |
HIP 60006 |
24.75 |
| 2026-08-03 00:00 |
12:18:39.65 |
-05:27:50.5 |
HIP 60006 |
26.26 |
| 2026-08-03 12:00 |
12:18:54.80 |
-05:29:04.2 |
HIP 60105 |
24.42 |
| 2026-08-04 00:00 |
12:19:10.03 |
-05:30:18.5 |
HIP 60105 |
21.85 |
| 2026-08-04 12:00 |
12:19:25.33 |
-05:31:33.5 |
HIP 60105 |
19.74 |
| 2026-08-05 00:00 |
12:19:40.72 |
-05:32:49.0 |
HIP 60105 |
18.27 |
| 2026-08-05 12:00 |
12:19:56.18 |
-05:34:05.1 |
HIP 60105 |
17.61 |
| 2026-08-06 00:00 |
12:20:11.72 |
-05:35:21.9 |
HIP 60105 |
17.87 |
| 2026-08-06 12:00 |
12:20:27.34 |
-05:36:39.2 |
HIP 60105 |
19.02 |
| 2026-08-07 00:00 |
12:20:43.04 |
-05:37:57.1 |
HIP 60105 |
20.93 |
| 2026-08-07 12:00 |
12:20:58.81 |
-05:39:15.6 |
HIP 60105 |
23.43 |
| 2026-08-08 00:00 |
12:21:14.65 |
-05:40:34.6 |
HIP 60389 |
26.02 |
| 2026-08-08 12:00 |
12:21:30.58 |
-05:41:54.3 |
HIP 60389 |
21.86 |
| 2026-08-09 00:00 |
12:21:46.57 |
-05:43:14.5 |
HIP 60389 |
17.69 |
| 2026-08-09 12:00 |
12:22:02.64 |
-05:44:35.3 |
HIP 60389 |
13.51 |
| 2026-08-10 00:00 |
12:22:18.79 |
-05:45:56.6 |
HIP 60389 |
9.35 |
| 2026-08-10 12:00 |
12:22:35.01 |
-05:47:18.5 |
HIP 60389 |
5.30 |
| 2026-08-11 00:00 |
12:22:51.29 |
-05:48:41.0 |
HIP 60389 |
2.24 |
| 2026-08-11 12:00 |
12:23:07.66 |
-05:50:04.0 |
HIP 60389 |
4.33 |
| 2026-08-12 00:00 |
12:23:24.09 |
-05:51:27.5 |
HIP 60389 |
8.35 |
| 2026-08-12 12:00 |
12:23:40.59 |
-05:52:51.6 |
HIP 60389 |
12.59 |
| 2026-08-13 00:00 |
12:23:57.16 |
-05:54:16.2 |
HIP 60436 |
14.82 |
| 2026-08-13 12:00 |
12:24:13.80 |
-05:55:41.3 |
HIP 60436 |
16.22 |
| 2026-08-14 00:00 |
12:24:30.51 |
-05:57:07.0 |
HIP 60436 |
18.58 |
| 2026-08-14 12:00 |
12:24:47.29 |
-05:58:33.2 |
HIP 60436 |
21.60 |
| 2026-08-15 00:00 |
12:25:04.13 |
-05:59:59.9 |
HIP 60702 |
21.02 |
| 2026-08-15 12:00 |
12:25:21.04 |
-06:01:27.1 |
HIP 60702 |
16.70 |
| 2026-08-16 00:00 |
12:25:38.01 |
-06:02:54.8 |
HIP 60702 |
12.46 |
| 2026-08-16 12:00 |
12:25:55.05 |
-06:04:23.0 |
HIP 60702 |
8.44 |
| 2026-08-17 00:00 |
12:26:12.16 |
-06:05:51.7 |
HIP 60702 |
5.24 |
| 2026-08-17 12:00 |
12:26:29.32 |
-06:07:20.8 |
HIP 60702 |
4.92 |
| 2026-08-18 00:00 |
12:26:46.55 |
-06:08:50.5 |
HIP 60702 |
7.88 |
| 2026-08-18 12:00 |
12:27:03.85 |
-06:10:20.6 |
HIP 60702 |
11.89 |
| 2026-08-19 00:00 |
12:27:21.20 |
-06:11:51.3 |
HIP 60702 |
16.21 |