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 · 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
$$
M_a = (12.918 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.918 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.509 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:23:33.84 |
-31:06:01.3 |
HIP 84995 |
19.35 |
| 2026-05-12 12:00 |
17:23:24.86 |
-31:06:00.0 |
HIP 84995 |
17.88 |
| 2026-05-13 00:00 |
17:23:15.82 |
-31:05:58.4 |
HIP 84995 |
16.50 |
| 2026-05-13 12:00 |
17:23:06.70 |
-31:05:56.5 |
HIP 84995 |
15.23 |
| 2026-05-14 00:00 |
17:22:57.52 |
-31:05:54.4 |
HIP 84995 |
14.12 |
| 2026-05-14 12:00 |
17:22:48.27 |
-31:05:51.9 |
HIP 84995 |
13.21 |
| 2026-05-15 00:00 |
17:22:38.96 |
-31:05:49.2 |
HIP 84995 |
12.54 |
| 2026-05-15 12:00 |
17:22:29.59 |
-31:05:46.2 |
HIP 84995 |
12.17 |
| 2026-05-16 00:00 |
17:22:20.15 |
-31:05:42.9 |
HIP 84995 |
12.13 |
| 2026-05-16 12:00 |
17:22:10.65 |
-31:05:39.4 |
HIP 84995 |
12.43 |
| 2026-05-17 00:00 |
17:22:01.09 |
-31:05:35.5 |
HIP 84995 |
13.06 |
| 2026-05-17 12:00 |
17:21:51.47 |
-31:05:31.4 |
HIP 84995 |
13.96 |
| 2026-05-18 00:00 |
17:21:41.80 |
-31:05:26.9 |
HIP 84995 |
15.11 |
| 2026-05-18 12:00 |
17:21:32.07 |
-31:05:22.2 |
HIP 84995 |
16.45 |
| 2026-05-19 00:00 |
17:21:22.28 |
-31:05:17.2 |
HIP 84995 |
17.94 |
| 2026-05-19 12:00 |
17:21:12.44 |
-31:05:11.9 |
HIP 84995 |
19.56 |
| 2026-05-20 00:00 |
17:21:02.55 |
-31:05:06.3 |
HIP 84995 |
21.27 |
| 2026-05-20 12:00 |
17:20:52.60 |
-31:05:00.4 |
HIP 84995 |
23.07 |
| 2026-05-21 00:00 |
17:20:42.60 |
-31:04:54.3 |
HIP 84734 |
24.90 |
| 2026-05-21 12:00 |
17:20:32.56 |
-31:04:47.8 |
HIP 84734 |
23.43 |
| 2026-05-22 00:00 |
17:20:22.47 |
-31:04:41.0 |
HIP 84734 |
22.08 |
| 2026-05-22 12:00 |
17:20:12.33 |
-31:04:34.0 |
HIP 84734 |
20.86 |
| 2026-05-23 00:00 |
17:20:02.15 |
-31:04:26.6 |
HIP 84734 |
19.81 |
| 2026-05-23 12:00 |
17:19:51.92 |
-31:04:19.0 |
HIP 84734 |
18.95 |
| 2026-05-24 00:00 |
17:19:41.65 |
-31:04:11.0 |
HIP 84734 |
18.31 |
| 2026-05-24 12:00 |
17:19:31.33 |
-31:04:02.8 |
HIP 84734 |
17.93 |
| 2026-05-25 00:00 |
17:19:20.98 |
-31:03:54.3 |
HIP 84734 |
17.82 |
| 2026-05-25 12:00 |
17:19:10.59 |
-31:03:45.4 |
HIP 84734 |
17.99 |
| 2026-05-26 00:00 |
17:19:00.16 |
-31:03:36.3 |
HIP 84734 |
18.43 |
| 2026-05-26 12:00 |
17:18:49.69 |
-31:03:26.9 |
HIP 84734 |
19.13 |
| 2026-05-27 00:00 |
17:18:39.19 |
-31:03:17.2 |
HIP 84734 |
20.07 |
| 2026-05-27 12:00 |
17:18:28.65 |
-31:03:07.2 |
HIP 84611 |
19.51 |
| 2026-05-28 00:00 |
17:18:18.08 |
-31:02:56.9 |
HIP 84611 |
18.32 |
| 2026-05-28 12:00 |
17:18:07.48 |
-31:02:46.3 |
HIP 84611 |
17.35 |
| 2026-05-29 00:00 |
17:17:56.85 |
-31:02:35.4 |
HIP 84611 |
16.62 |
| 2026-05-29 12:00 |
17:17:46.18 |
-31:02:24.2 |
HIP 84611 |
16.19 |
| 2026-05-30 00:00 |
17:17:35.49 |
-31:02:12.8 |
HIP 84611 |
16.07 |
| 2026-05-30 12:00 |
17:17:24.78 |
-31:02:01.0 |
HIP 84611 |
16.27 |
| 2026-05-31 00:00 |
17:17:14.03 |
-31:01:48.9 |
HIP 84611 |
16.79 |
| 2026-05-31 12:00 |
17:17:03.26 |
-31:01:36.5 |
HIP 84611 |
17.60 |
| 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 |