메타데이터
| 항목 |
값 |
| Designation |
P/2018 Y2 (Africano) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-01-02T14:21:44.887680Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:01Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-12-31T07:03:45.792000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-01-11.0000000 |
| e |
0.47934818 |
| q (au) |
3.893253 |
| a (au) |
7.477652 |
| i (deg) |
11.680345 |
| Ω (om, deg) |
297.264911 |
| ω (w, deg) |
162.498617 |
| M (ma, deg) |
0.404964 |
밝기
산란 + 전체 선형
$$
M_a = (13.087 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.087 |
| n |
2.000 |
| gf |
0.991 |
| gb |
-0.944 |
| k |
1.000 |
| δ90 |
9.528 |
| 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) |
| 2026-06-01 00:00 |
17:16:52.47 |
-31:01:23.9 |
HIP 84611 |
18.67 |
| 2026-06-01 12:00 |
17:16:41.65 |
-31:01:10.9 |
HIP 84611 |
19.94 |
| 2026-06-02 00:00 |
17:16:30.82 |
-31:00:57.7 |
HIP 84611 |
21.40 |
| 2026-06-02 12:00 |
17:16:19.96 |
-31:00:44.2 |
HIP 84611 |
23.00 |
| 2026-06-03 00:00 |
17:16:09.09 |
-31:00:30.4 |
HIP 84381 |
23.72 |
| 2026-06-03 12:00 |
17:15:58.20 |
-31:00:16.2 |
HIP 84381 |
22.62 |
| 2026-06-04 00:00 |
17:15:47.29 |
-31:00:01.8 |
HIP 84381 |
21.73 |
| 2026-06-04 12:00 |
17:15:36.36 |
-30:59:47.2 |
HIP 84381 |
21.06 |
| 2026-06-05 00:00 |
17:15:25.43 |
-30:59:32.2 |
HIP 84318 |
19.64 |
| 2026-06-05 12:00 |
17:15:14.48 |
-30:59:16.9 |
HIP 84318 |
18.13 |
| 2026-06-06 00:00 |
17:15:03.51 |
-30:59:01.4 |
HIP 84318 |
16.82 |
| 2026-06-06 12:00 |
17:14:52.54 |
-30:58:45.5 |
HIP 84318 |
15.76 |
| 2026-06-07 00:00 |
17:14:41.56 |
-30:58:29.4 |
HIP 84318 |
15.01 |
| 2026-06-07 12:00 |
17:14:30.57 |
-30:58:13.0 |
HIP 84318 |
14.60 |
| 2026-06-08 00:00 |
17:14:19.58 |
-30:57:56.3 |
HIP 84318 |
14.59 |
| 2026-06-08 12:00 |
17:14:08.58 |
-30:57:39.4 |
HIP 84318 |
14.95 |
| 2026-06-09 00:00 |
17:13:57.58 |
-30:57:22.1 |
HIP 84318 |
15.68 |
| 2026-06-09 12:00 |
17:13:46.57 |
-30:57:04.6 |
HIP 84318 |
16.72 |
| 2026-06-10 00:00 |
17:13:35.57 |
-30:56:46.8 |
HIP 84318 |
18.01 |
| 2026-06-10 12:00 |
17:13:24.56 |
-30:56:28.7 |
HIP 84142 |
19.10 |
| 2026-06-11 00:00 |
17:13:13.55 |
-30:56:10.4 |
HIP 84142 |
16.97 |
| 2026-06-11 12:00 |
17:13:02.55 |
-30:55:51.8 |
HIP 84142 |
14.90 |
| 2026-06-12 00:00 |
17:12:51.55 |
-30:55:32.9 |
HIP 84142 |
12.94 |
| 2026-06-12 12:00 |
17:12:40.56 |
-30:55:13.7 |
HIP 84142 |
11.15 |
| 2026-06-13 00:00 |
17:12:29.58 |
-30:54:54.3 |
HIP 84142 |
9.61 |
| 2026-06-13 12:00 |
17:12:18.60 |
-30:54:34.6 |
HIP 84142 |
8.46 |
| 2026-06-14 00:00 |
17:12:07.63 |
-30:54:14.7 |
HIP 84142 |
7.88 |
| 2026-06-14 12:00 |
17:11:56.67 |
-30:53:54.4 |
HIP 84142 |
7.99 |
| 2026-06-15 00:00 |
17:11:45.73 |
-30:53:34.0 |
HIP 84142 |
8.77 |
| 2026-06-15 12:00 |
17:11:34.80 |
-30:53:13.2 |
HIP 84142 |
10.05 |
| 2026-06-16 00:00 |
17:11:23.88 |
-30:52:52.2 |
HIP 84142 |
11.67 |
| 2026-06-16 12:00 |
17:11:12.98 |
-30:52:31.0 |
HIP 84142 |
13.51 |
| 2026-06-17 00:00 |
17:11:02.10 |
-30:52:09.5 |
HIP 84142 |
15.49 |
| 2026-06-17 12:00 |
17:10:51.24 |
-30:51:47.8 |
HIP 84142 |
17.56 |
| 2026-06-18 00:00 |
17:10:40.40 |
-30:51:25.8 |
HIP 84142 |
19.69 |
| 2026-06-18 12:00 |
17:10:29.58 |
-30:51:03.5 |
HIP 84142 |
21.86 |
| 2026-06-19 00:00 |
17:10:18.78 |
-30:50:41.1 |
HIP 84142 |
24.06 |
| 2026-06-19 12:00 |
17:10:08.01 |
-30:50:18.3 |
HIP 84142 |
26.28 |
| 2026-06-20 00:00 |
17:09:57.27 |
-30:49:55.4 |
HIP 84142 |
28.52 |
| 2026-06-20 12:00 |
17:09:46.55 |
-30:49:32.2 |
HIP 83896 |
28.33 |
| 2026-06-21 00:00 |
17:09:35.86 |
-30:49:08.8 |
HIP 83896 |
27.01 |
| 2026-06-21 12:00 |
17:09:25.20 |
-30:48:45.2 |
HIP 83896 |
25.84 |
| 2026-06-22 00:00 |
17:09:14.57 |
-30:48:21.3 |
HIP 83896 |
24.83 |